National Fire Protection Association - NFPA · Report on Comments – June 2013 NFPA 70 Revise the parent text for 516.2 to make it consistent with the new parent text of 504.2. A

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AGENDA

NEC Code-Making Panel 14

Report on Comment Meeting

November 28-December 1, 2012

Redondo Beach, CA

Item No. Subject 12-11-1 Call to Order 12-11-2 Introduction of Members and Guests 12-11-3 Review of Meeting Procedures and Revision Schedule 12-11-4 Approval of ROP Meeting Minutes 12-11-5 Task Group Reports (if any) 12-11-6 Processing of Comments 12-11-7 Fire Protection Research Foundation Requests 12-11-8 Old Business 12-11-9 New Business 12-11-10 Adjournment

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Report on Comments – June 2013 NFPA 70_______________________________________________________________________________________________14-1 Log #392 NEC-P14

_______________________________________________________________________________________________John L. Simmons, Florida East Coast Electrical JATC

14-3Revise the text found in Sections 500.2, 504.2, 505.2, 506.2, 513.2, 515.2 and 516.2 as follows:

● Revise the parent text of 500.2 to include all definitions in Articles 500 – 516 that appear in more than one article. Anew last sentence is added to make it clear that 500.2 may have definitions that apply to Articles 505 and 506 but thatno other sections of Article 500 apply to 505 or 506 unless they are specifically referenced in the article. This will clarifythe intent of CMP14 that Articles 505 and 506 are not a part of the hazardous locations protection methods prescribed inArticle 500.

● Relocate the term “associated apparatus” from 504.2 to 500.2. The term is used in Articles 500, 504, 505 and 506.● Include the new term “cord connector” which was introduced in Proposal 14-11b and accepted by CMP14.● Update the standard dates in the informational note for dust-ignitionproof.● Change the term dusttight to dusttight (as applied to Hazardous (Classified) Locations). This will in essence remove

the conflict between the definition in 500.2 and Article 100 and it is consistent with the format used in Article 100 to allowtwo definitions for accessible (accessible (as applied to equipment) and accessible (as applied to wiring methods).

● Dusttight Informational Note – see panel action on Proposal 14-10.● Electrical and Electronic Equipment Informational Note – see panel action on Proposal 14-10.● Change the term explosionproof equipment to explosionproof equipment (as applied to Hazardous (Classified)

Locations). This will in essence remove the conflict between the definition in 500.2 and Article 100 and it is consistentwith the format used in Article 100 to allow two definitions for accessible (accessible (as applied to equipment) andaccessible (as applied to wiring methods).

● Hermetically Sealed Informational Note – see panel action on Proposal 14-10.● Relocate the definition of “intrinsically safe apparatus” from 504.2 to 500.2. The term is found in Articles 500, 503,

504, 505 and 506.● Nonincendive Circuit Informational Note – see panel action on Proposal 14-10.● Nonincendive Component Informational Note – see panel action on Proposal 14-10.● Nonincendive Equipment Informational Note – see panel action on Proposal 14-10.● Nonincendive Field Wiring Apparatus Informational Note – see panel action on Proposal 14-10.● Delete the Informational Note for Oil Immersion. UL 698 has been withdrawn.● Relocate the definition of “pressurized” and the Informational Note for the definition from 506.2 to 500.2. The term is

found in Articles 501, 505 and 506. Since the term is also used in Article 326, the phrase “as applied to Hazardous(Classified) Locations” has been added to make it perfectly clear that this definition is not intended to define the term asused in that article.

● Relocate the definition of “simple apparatus” and the Informational Note for the definition from 504.2 to 500.2. Theterm is found in Articles 500, 501, 502, 503, 504, 505 and 506.

● Create new section 501.2 Definitions and refer back to 500.2. This will add clarity to the use of definitions in Articles500 – 516.



● Create new parent text for 504.2. The new text will make it perfectly clear that the defined terms in the section applyspecifically to Article 504.

● Delete the definition of “associated apparatus" from 504.2 and relocate it to 500.2. The term is used in Articles 500,504, 505 and 506.

● Delete the control drawing reference to 500.2. With the proposed restructuring of the definitions in Article 500 – 516it is perfectly clear that defined terms will be found in one of two locations; 500.2 if the term is used in more than onearticle and the dot 2 section of the article it appears in, if it is only used in that article.

● Delete the definition of “intrinsically safe apparatus” from 504.2 and relocate it to 500.2. The term is used in Articles500, 503, 504, 505, and 506.

● Update the standard date in the Informational Note for “intrinsically safe circuit”.● Delete the definition of “simple apparatus” from 504.2 and relocate it to 500.2. The term is used in Articles 500, 501,

502, 503, 504, 505, and 506.

1Printed on 10/31/2012

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Report on Comments – June 2013 NFPA 70● Revise the parent text for 505.2 to make it consistent with the new parent text of 504.2.● Delete the definition of “combustible gas detection system” from 505.2. The term is defined in 500.2 and 505.2 in the

current version of the NEC (2008). The term is used Articles 500 and 505. Under the proposed restructure, definitions ofterms used in more than one article (500 – 516) are being placed in 500.2.

● Delete the definition of “electrical and electronic equipment” and its Informational Note from 505.2. The term isdefined in 500.2 and 505.2 in the current version of the NEC (2008). The term is used Articles 500, 501, 502, 503, 505,and 506. Under the proposed restructure, definitions of terms used in more than one article (500 – 516) are being placedin 500.2.

● Revise Informational Note 1 and Note 2 for “encapsulation 'm'.” See the panel action on Proposal 14-131.● Revise the standard information in the Informational Note for “flameproof “d”. See the panel action on Proposal

14-129.● Revise the standard information in the Informational Note for “intrinsic safety 'i'”. See the panel action on Proposal

14-129.● Oil Immersion “o” Informational Note: insert the standard date.● Powder Filling “q” Informational Note: insert the standard date.● Revise the standard information in the Informational Note for “pressurization “p””. See the panel action on Proposal

14-129.● Revise the standard information in the Informational Note for “type of protection “n””. See the panel action on

Proposal 14-129.● Delete the definition of “unclassified locations” from 505.2. The term is defined in 500.2 and 505.2 in the current

version of the NEC (2008). The term is used Articles 500, 501, 502, 503, 504, 505, 506, 513, 514, and 516. Under theproposed restructure, definitions of terms used in more than one article (500 – 516) are being placed in 500.2.

● Revise the parent text for 506.2 to make it consistent with the new parent text of 504.2.● Delete the definition of “associated nonincendive field wiring apparatus” from 506.2. The term is defined in 500.2

and 506.2 in the current version of the NEC (2008). The term is used Articles 500, and 506. Under the proposedrestructure, definitions of terms used in more than one article (500 – 516) are being placed in 500.2.

● Delete the definition of “combustible dust” from 506.2. The term is defined in 500.2 and 505.2 in the current versionof the NEC (2008). The term is used Articles 500, 502, 504, 505, 506, and 516. Under the proposed restructure,definitions of terms used in more than one article (500 – 516) are being placed in 500.2.

● Delete the definition of “dust-ignitionproof” and its Informational Note from 506.2. The term is defined in 500.2 and505.2 in the current version of the NEC (2008). The term is used Articles 500, 502, and 506. (Other than the definition in506.2 the term is only used one other time in 506 and that is in an informational note.) Under the proposed restructure,definitions of terms used in more than one article (500 – 516) are being placed in 500.2.

● Delete the definition of “dusttight” from 506.2. The term is defined in Article 100 and sections 500.2 and 505.2 in thecurrent version of the NEC (2008). The term is used Articles 500, 502, 503, and 506. Under the proposed restructure,definitions of terms used in more than one article (500 – 516) are being placed in 500.2.

● Delete the definition of “nonincendive circuit” and its Informational Note from 506.2. The term is defined in 500.2 and506.2 in the current version of the NEC (2008). The term is used in Articles 500, 501, 502, 503, and 506.

● Delete the definition of “nonincendive equipment” and its Informational Note from 506.2. The term is defined in 500.2and 506.2 in the current version of the NEC (2008). The term is used in Articles 500, 506, and 516.

● Delete the definition of “nonincendive field wiring” from 506.2. The term is defined in 500.2 and 506.2 in the currentversion of the NEC (2008). The term is used in Articles 500, 501, 502,503, 504, and 506.

● Delete the definition of “nonincendive field wiring apparatus” and its Informational Note from 506.2. The term isdefined in 500.2 and 506.2 in the current version of the NEC (2008). The term is used in Articles 500, 501, 502, 503,and 506.

● Delete the definition of “pressurized” and its Informational Note from 506.2. The term is defined in 500.2 and 506.2in the current version of the NEC (2008). The term is used in Articles 501, 505 and 506.

● Change protection by encapsulation “mD” to protection by encapsulation “m” and revise the standard in theInformational Note No. 1. Revise Informational Note No. 2. See panel action on Proposal 14-196.

● Change protection by enclosure “tD” to protection by encapsulation “t” and revise the standard in the InformationalNote No. 1. Add new Informational Note No. 2. See panel action on Proposal 14-198.

● Revise the parent text for 513.2 to make it consistent with the new parent text of 504.2.● Change the term portable equipment to portable equipment (as applied to Article 513). The term portable equipment

appears in Articles 250,368, 430, 490, 511, 513, 516, 517, 518, 520, 525, 530, 540, 640, 668, 675, and 680. The term isdefined in Articles 513, 520, 530, 640, and 680. This proposed change makes it clear that the definition found in 513.2 isspecific to Article 513.

● Delete 515.2 in its entirety. See Proposal 14-241.


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Report on Comments – June 2013 NFPA 70● Revise the parent text for 516.2 to make it consistent with the new parent text of 504.2.A copy of the NEC code text with proposed changes follows:

The definitions found in this section are specific to the Hazardous (Classified) Locations found inFor purposes of Articles 500 through 504 and Articles 510 through 516 the following definitions apply. No other sectionof this Article shall apply to Article 505 or 506 unless it is specifically referenced in that article.

Apparatus in which the circuits are not necessarily intrinsically safe themselves but that affectthe energy in the intrinsically safe circuits and are relied on to maintain intrinsic safety. Associated apparatus may beeither of the following:

(1) Electrical apparatus that has an alternative-type of protection for use in the appropriate hazardous (classified)location

(2) Electrical apparatus not so protected that shall not be used within a hazardous (classified) locationInformational Note No. 1: Associated apparatus has identified intrinsically safe connections for intrinsically safe

apparatus and also may have connections for nonintrinsically safe apparatus.Informational Note No. 2: An example of associated apparatus is an intrinsic safety barrier, which is a network

designed to limit the energy (voltage and current) available to the protected circuit in the hazardous (classified) location,under specified fault conditions.

Apparatus in which the circuits are not necessarily nonincendivethemselves but that affect the energy in nonincendive field wiring circuits and are relied upon to maintain nonincendiveenergy levels. Associated nonincendive field wiring apparatus may be either of the following:

(1) Electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified)location

(2) Electrical apparatus not so protected that shall not be used in a hazardous (classified) location Informational Note:Associated nonincendive field wiring apparatus has designated associated nonincendive field wiring apparatusconnections for nonincendive field wiring apparatus and may also have connections for other electrical apparatus.

Any finely divided solid material that is 420 microns (0.017 in.) or smaller in diameter (materialpassing a U.S. No. 40 Standard Sieve) and presents a fire or explosion hazard when dispersed and ignited in air. [2008]

A protection technique utilizing stationary gas detectors in industrialestablishments.

A drawing or other document provided by the manufacturer of the intrinsically safe or associatedapparatus, or of the nonincendive field wiring apparatus or associated nonincendive field wiring apparatus, that detailsthe allowed interconnections between the intrinsically safe and associated apparatus or between the nonincendive fieldwiring apparatus or associated nonincendive field wiring apparatus.

A fitting intended to terminate a cord to a box or similar device and reduce the strain at points oftermination and may include an explosionproof, a dust-ignition proof, or a flameproof seal.

Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heatotherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmosphericsuspensions of a specified dust on or in the vicinity of the enclosure.

Informational Note: For further information on dustignitionproof enclosures, see Type 9 enclosure in ANSI/NEMA250-1991 2008, , and ANSI/UL 1203-1994 2009,

.Enclosures constructed so that dust will not enter under

specified test conditions.Informational Note: See ANSI/ISA-12.12.01-2007,

. ANSI/ISA-12.12.01-2011,

Materials, fittings, devices, appliances, and the like that are part of, or inconnection with, an electrical installation.

Informational Note: Portable or transportable equipment having self-contained power supplies, such asbattery-operated equipment, could potentially become an ignition source in hazardous (classified) locations. SeeISA-RP12.12.03-2002,

ANSI/ISA-12.12.03-2011,

.Equipment enclosed in a case that is

capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of


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Report on Comments – June 2013 NFPA 70a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and thatoperates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby.

Informational Note: For further information, see ANSI/UL 1203-1994 2009,.

Equipment sealed against the entrance of an external atmosphere where the seal is made byfusion, for example, soldering, brazing, welding, or the fusion of glass to metal.

Informational Note: For further information, see ANSI/ISA-12.12.01-2007,. ANSI/ISA-12.12.01-2011,

Apparatus in which all the circuits are intrinsically safe.A circuit, other than field wiring, in which any arc or thermal effect produced under intended

operating conditions of the equipment, is not capable, under specified test conditions, of igniting the flammable gas–air,vapor–air, or dust–air mixture.

Informational Note: Conditions are described in ANSI/ISA-12.12.01-2007,. ANSI/ISA-12.12.01-2011,

A component having contacts for making or breaking an incendive circuit and thecontacting mechanism is constructed so that the component is incapable of igniting the specified flammable gas–air orvapor–air mixture. The housing of a nonincendive component is not intended to exclude the flammable atmosphere orcontain an explosion.

Informational Note: For further information, see ANSI/ISA-12.12.01-2007,ANSI/ISA-12.12.01-2011,

Equipment having electrical/electronic circuitry that is incapable, under normal operatingconditions, of causing ignition of a specified flammable gas–air, vapor–air, or dust–air mixture due to arcing or thermalmeans.

Informational Note: For further information, see ANSI/ISA-12.12.01-2007,. ANSI/ISA-12.12.01-2011,

Wiring that enters or leaves an equipment enclosure and, under normal operatingconditions of the equipment, is not capable, due to arcing or thermal effects, of igniting the flammable gas–air, vapor–air,or dust–air mixture. Normal operation includes opening, shorting, or grounding the field wiring.

Apparatus intended to be connected to nonincendive field wiring.Informational Note: For further information, see ANSI/ISA-12.12.01-2007,

. ANSI/ISA-12.12.01-2011,

Electrical equipment immersed in a protective liquid in such a way that an explosive atmosphere thatmay be above the liquid or outside the enclosure cannot be ignited.

Informational Note: For further information, see ANSI/UL 698-1995,.

The process of supplying an enclosure with aprotective gas with or without continuous flow at sufficient pressure to prevent the entrance of combustible dust orignitable fibers/flyings.

Informational Note: For further information, see ANSI/NFPA 496-2008,

The process of (1) purging, supplying an enclosure with a protective gas at a sufficient flowand positive pressure to reduce the concentration of any flammable gas or vapor initially present to an acceptable level;and (2) pressurization, supplying an enclosure with a protective gas with or without continuous flow at sufficient pressureto prevent the entrance of a flammable gas or vapor, a combustible dust, or an ignitable fiber.

Informational Note: For further information, see ANSI/NFPA 496-2008,.An electrical component or combination of components of simple construction with well defined


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Report on Comments – June 2013 NFPA 70electrical parameters that does not generate more than 1.5 volts, 100 milliamps, and 25 milliwatts, or a passivecomponent that does not dissipate more than 1.3 watts and is compatible with the intrinsic safety of the circuit in which itis used.

Informational Note: The following apparatus are examples of simple apparatus:a) Passive components, for example, switches, junction boxes, resistance temperature devices, and simple

semiconductor devices such as LEDsb) Sources of stored energy consisting of single components in simple circuits with well-defined parameters, for

example, capacitors or inductors, whose values are considered when determining the overall safety of the systemc) Sources of generated energy, for example, thermocouples and photocells, which do not generate more than 1.5 V,

100 mA milliamps, and 25 mW milliwattsLocations determined to be neither Class I, Division 1; Class I, Division 2; Class I, Zone 0;

Class I, Zone 1; Class I, Zone 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; Class III, Division 2; Zone20; Zone 21; Zone 22; or any combination thereof.

See 500.2.See 500.2.See 500.2.Definitions found in this section are specific to this Article.

Apparatus in which the circuits are not necessarily intrinsically safe themselves but that affectthe energy in the intrinsically safe circuits and are relied on to maintain intrinsic safety. Associated apparatus may beeither of the following:

(1) Electrical apparatus that has an alternative-type protection for use in the appropriate hazardous (classified) location(2) Electrical apparatus not so protected that shall not be used within a hazardous (classified) locationInformational Note No. 1: Associated apparatus has identified intrinsically safe connections for intrinsically safe

apparatus and also may have connections for nonintrinsically safe apparatus.Informational Note No. 2: An example of associated apparatus is an intrinsic safety barrier, which is a network

designed to limit the energy (voltage and current) available to the protected circuit in the hazardous (classified) location,under specified fault conditions.

See the definition in 500.2.Intrinsically safe circuits in which the possible interconnections have not been

evaluated and identified as intrinsically safe.Apparatus in which all the circuits are intrinsically safe.

A circuit in which any spark or thermal effect is incapable of causing ignition of a mixture offlammable or combustible material in air under prescribed test conditions.

Informational Note: Test conditions are described in ANSI/UL 913-1997 2006,.

An assembly of interconnected intrinsically safe apparatus, associated apparatus, andinterconnecting cables, in that those parts of the system that may be used in hazardous (classified) locations areintrinsically safe circuits.

Informational Note: An intrinsically safe system may include more than one intrinsically safe circuit.An electrical component or combination of components of simple construction with well defined

electrical parameters that does not generate more than 1.5 volts, 100 milliamps, and 25 milliwatts, or a passivecomponent that does not dissipate more than 1.3 watts and is compatible with the intrinsic safety of the circuit in which itis used.

Informational Note: The following apparatus are examples of simple apparatus:d) Passive components, for example, switches, junction boxes, resistance temperature devices, and simple

semiconductor devices such as LEDse) Sources of stored energy consisting of single components in simple circuits with well-defined parameters, for

example, capacitors or inductors, whose values are considered when determining the overall safety of the systemf) Sources of generated energy, for example, thermocouples and photocells, which do not generate more than 1.5 V,

100 mA, and 25 mWFor purposes of this article, the following definitions apply. Definitions found in this section are

specific to this Article.A protection technique utilizing stationary gas detectors in industrial

establishments.Materials, fittings, devices, appliances, and the like that are part of, or in

connection with, an electrical installation.Informational Note: Portable or transportable equipment having self-contained power supplies, such as battery


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Report on Comments – June 2013 NFPA 70operated equipment, could potentially become an ignition source in hazardous (classified) locations.

Type of protection where electrical parts that could ignite an explosive atmosphere by eithersparking or heating are enclosed in a compound in such a way that this explosive atmosphere cannot be ignited.

Informational Note No. 1: See ANSI/ISA-60079-18 (12.23.01)-2009,;

IEC 0079–18-1992,and ANSI/UL 60079-18,

-2009, Explosive atmospheres - Part 18: Equipment protection by encapsulation “m”.Informational Note No. 2: Encapsulation is designated type of protection “ma” for use in Zone 0 locations.

Encapsulation is designated type of protection “m” or “mb” for use in Zone 1 locations. Encapsulation is designated typeof protection “mc” for use in Zone 2 locations.

Type of protection where the enclosure will withstand an internal explosion of a flammable mixturethat has penetrated into the interior, without suffering damage and without causing ignition, through any joints orstructural openings in the enclosure, of an external explosive gas atmosphere consisting of one or more of the gases orvapors for which it is designed.

Informational Note: See ANSI/ISA-60079-1 (12.22.01)-2008,; ANSI/ISA-60079-1-2009 (12.22.01),

and ANSI/UL 60079–1-2009,

Type of protection applied to electrical equipment that does not produce arcs or sparks innormal service and under specified abnormal conditions, in which additional measures are applied so as to giveincreased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks.

Informational Note: See ANSI/ISA-60079-7 (12.16.01) - 2008,; and ANSI/UL 60079-7-2008,

Type of protection where any spark or thermal effect is incapable of causing ignition of a mixture offlammable or combustible material in air under prescribed test conditions.

Informational Note No. 1: See ANSI/UL 913-1997 2006,; ANSI/ISA-60079-11 (12.02.01)-2009,; ANSI/ISA-60079-11-2011 (12.02.01),and ANSI/UL 60079-11-2011,

Informational Note No. 2: Intrinsic safety is designated type of protection “ia” for use in Zone 0 locations. Intrinsic safetyis designated type of protection “ib” for use in Zone 1 locations. Intrinsic safety is designated type of protection “ic” foruse in Zone 2 locations.

Informational Note No. 3: Intrinsically safe associated apparatus, designated by [ia], [ib], or [ic], is connected tointrinsically safe apparatus (“ia,” “ib,” or “ic,” respectively) but is located outside the hazardous (classified) locationunless also protected by another type of protection (such as flameproof).

Type of protection where electrical equipment is immersed in a protective liquid in such a way thatan explosive atmosphere that may be above the liquid or outside the enclosure cannot be ignited.

Informational Note: See ANSI/ISA-60079-6 (12.00.05)-2009,; and ANSI/UL 60079-6-2009,

Type of protection where electrical parts capable of igniting an explosive atmosphere are fixed inposition and completely surrounded by filling material (glass or quartz powder) to prevent the ignition of an externalexplosive atmosphere.

Informational Note: See ANSI/ISA-60079-5 (12.00.04)-2009,; and ANSI/UL 60079-5-2009,

Type of protection for electrical equipment that uses the technique of guarding against the ingressof the external atmosphere, which may be explosive, into an enclosure by maintaining a protective gas therein at apressure above that of the external atmosphere.

Informational Note: See ANSI/ISA-60079-2 (12.04.01)-2004,; ANSI/ISA-60079-2-2010 (12.04.01),

and IEC 60079-13-2010,.

Type of protection where electrical equipment, in normal operation, is not capable of igniting a


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Report on Comments – June 2013 NFPA 70surrounding explosive gas atmosphere and a fault capable of causing ignition is not likely to occur.

Informational Note: See ANSI/UL 60079-15,; and ANSI/ISA-60079-15 (12.12.02)-2008,

ANSI/ISA-60079-15-2009 (12.12.02)-2009,

Locations determined to be neither Class I, Division 1; Class I, Division 2; Class I, Zone 0;Zone 1; Zone 2; Class II, Division 1; Class II, Division 2; Class III, Division 1; Class III, Division 2; or any combinationthereof.

For purposes of this article, the following definitions apply. Definitions found in this section arespecific to this Article.

Apparatus in which the circuits are not necessarily nonincendivethemselves but that affects the energy in nonincendive field wiring circuits and are relied upon to maintain nonincendiveenergy levels. Associated nonincendive field wiring apparatus may be either of the following:

(1) Electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified)location

(2) Electrical apparatus not so protected that shall not be used in a hazardous (classified) locationInformational Note: Associated nonincendive field wiring apparatus has designated associated nonincendive field

wiring apparatus connections for nonincendive field wiring apparatus and may also have connections for other electricalapparatus.

Any finely divided solid material that is 420 microns (0.017 in.) or smaller in diameter (materialpassing a U.S. No. 40 Standard Sieve) and presents a fire or explosion hazard when dispersed and ignited in air.[ 3.3.3]

Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heatotherwise generated or liberated inside of the enclosure to cause ignition of exterior accumulations or atmosphericsuspensions of a specified dust on or in the vicinity of the enclosure.

Informational Note: For further information on dustignitionproof enclosures, see Type 9 enclosure in ANSI/NEMA250-1991, , and ANSI/UL 1203-1994,

.Enclosures constructed so that dust will not enter under specified test conditions.

A circuit, other than field wiring, in which any arc or thermal effect produced under intendedoperating conditions of the equipment, is not capable, under specified test conditions, of igniting the flammable gas–air,vapor–air, or dust–air mixture.

Informational Note: Conditions are described in ANSI/ISA-12.12.01-2007,.

Equipment having electrical/electronic circuitry that is incapable, under normal operatingconditions, of causing ignition of a specified flammable gas–air, vapor–air, or dust–air mixture due to arcing or thermalmeans.

Informational Note: Conditions are described in ANSI/ISA-12.12.01-2007,

Wiring that enters or leaves an equipment enclosure and, under normal operatingconditions of the equipment, is not capable, due to arcing or thermal effects, of igniting the flammable gas–air, vapor–air,or dust–air mixture. Normal operation includes opening, shorting, or grounding the field wiring.

Apparatus intended to be connected to nonincendive field wiring.Informational Note: Conditions are described in ANSI/ISA-12.12.01-2007,

The process of supplying an enclosure with a protective gas with or without continuous flow at sufficientpressure to prevent the entrance of combustible dust or ignitable fibers/flyings.

Informational Note: For further information, see ANSI/NFPA 496-2008,

Type of protection where electrical parts that could cause ignition of a mixture ofcombustible dust or fibers/flyings in air are protected by enclosing them in a compound in such a way that the explosiveatmosphere cannot be ignited.

Informational Note No. 1: For additional information, see ANSI/ISA-61241-18 (12.10.07)-2006,

ANSI/ISA-60079-18 (12.23.01)-2009, ,ANSI/UL 60079-18-2009, , andANSI/ISA-61241-18 (12.10.07)-2011,


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Report on Comments – June 2013 NFPA 70.

Informational Note No. 2: Encapsulation is designated level of protection “maD” or “ma” for use in Zone 20 locations.Encapsulation is designated level of protection “mbD” or “mb” for use in Zone 21 locations. Encapsulation is designatedtype of protection “mc” for use in Zone 22 locations.

Type of protection for explosive dust atmospheres where electrical apparatus isprovided with an enclosure providing dust ingress protection and a means to limit surface temperatures.

Informational Note 1: For additional information, see ANSI/ISA-60079-31 (12.10.03)-2006 2009,ANSI/ISA-61241-0 (12.10.02)-2006,

, and ANSI/ISA-61241-1 (12.10.03)-2006 2011,

Informational Note No. 2: Protection by Enclosure is designated level of protection “ta” for use in Zone 20 locations.Protection by Enclosure is designated level of protection “tb” or “tD” for use in Zone 21 locations. Protection byEnclosure is designated level of protection “tc” or “tD” for use in Zone 22 locations.

Type of protection where any spark or thermal effect is incapable of causingignition of a mixture of combustible dust, fibers, or flyings in air under prescribed test conditions.

Informational Note: For additional information, see ANSI/ISA-61241-11 (12.10.04),

Type of protection that guards against the ingress of a mixture of combustible dustor fibers/flyings in air into an enclosure containing electrical equipment by providing and maintaining a protective gasatmosphere inside the enclosure at a pressure above that of the external atmosphere.

Informational Note: For additional information, see ANSI/ISA-61241-2 (12.10.06),.”

An area where combustible dust or ignitable fibers/flyings are presentcontinuously or for long periods of time in quantities sufficient to be hazardous, as classified by 506.5(B)(1).

An area where combustible dust or ignitable fibers/flyings are likely to existoccasionally under normal operation in quantities sufficient to be hazardous, as classified by 506.5(B)(2).

An area where combustible dust or ignitable fibers/flyings are not likely tooccur under normal operation in quantities sufficient to be hazardous, as classified by 506.5(B)(3).

For the purpose of this article, the following definitions shall apply. Definitions found in this sectionare specific to this Article.

An aircraft hangar constructed for the express purpose of spray/coating/dipping applicationsand provided with dedicated ventilation supply and exhaust.

Equipment with electrical components suitable to be moved only with mechanical aids or isprovided with wheels for movement by person(s) or powered devices.

Equipment with electrical components suitable to be moved by asingle person without mechanical aids.

That portion of a property where liquids are received by tank vessel, pipelines, tank car, ortank vehicle and are stored or blended in bulk for the purpose of distributing such liquids by tank vessel, pipeline, tankcar, tank vehicle, portable tank, or container. [ 3.3.32.1]

Informational Note: For further information, see NFPA 30-2008, .For the purpose of this article, the following definitions shall apply. Definitions found in this section

are specific to this Article.Normally, locations outside of buildings or localized operations within a larger room or space. Such are

normally provided with some local vapor extraction/ventilation system. In automated operations, the area limits shall bethe maximum area in the direct path of spray operations. In manual operations, the area limits shall be the maximumarea of spray when aimed at 180 degrees to the application surface.

An enclosure or insert within a larger room used for spray/coating/dipping applications. A spray boothmay be fully enclosed or have open front or face and may include separate conveyor entrance and exit. The spray boothis provided with a dedicated ventilation exhaust but may draw supply air from the larger room or have a dedicated airsupply.

A purposefully enclosed room built for spray/coating/dipping applications provided with dedicatedventilation supply and exhaust. Normally the room is configured to house the item to be painted, providing reasonableaccess around the item/process. Depending on the size of the item being painted, such rooms may actually be theentire building or the major portion thereof.

This comment is the product of the task group request by the TCC (reference Proposal 14-3). The


Page 14 of 62

Report on Comments – June 2013 NFPA 70group was appointed by the panel chair Robert Jones. The task group chair is John Simmons. Panel members are:William Lawrence, Edward Briesch, Jack Jamison, Mark Goodman, Larry Burns, and David Wechsler.

The suggested changes resolve the issues surrounding any duplicate or conflicting definitions within the purview ofCMP14. The revisions that are made involve relocating any definition used in more than one article (500-516) to 500.2.Definitions specific to any article remain in the article where they are used. Definitions found in Articles 500-516 that arefound in articles other than 500-516 have been revised by changing the defined term (i.e. Dusttight (as applied toHazardous (Classified) Locations)). The reorganization of the Article 500 – 516 definitions will add clarity to the code.


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_______________________________________________________________________________________________David Wechsler, American Chemical Council

14-11bDo not add a new definition to 500.2, 505.2 and 506.2 reading:

Cord Connector. A fitting intended to terminate a cord to a box or similar device and reduce the strain at points oftermination and may include an explosionproof, a dust ignition proof, or a flameproof seal.

Under 501.140 (B) (4) change cord connector to cord fitting as shown below:(4) In Division 1 locations or in Division 2 locations where the boxes, fittings, or enclosures are required to be

explosionproof, the cord shall be terminated with a cord fitting connector or attachment plug listed for the location or acord fitting connector installed with a seal listed for the location. In Division 2 locations where explosionproof equipmentis not required, the cord shall be terminated with a listed cord fitting connector or listed attachment plug.

Under 502.140 (B) (4) change cord connector to fitting as shown below:(4) In Division 1 locations, the cord shall be terminated with a cord fitting connector listed for the location or a listed

cord fitting connector installed with a seal listed for the location. In Division 2 locations, the cord shall be terminated witha listed dusttight cord fitting connector.

Under 503.140 (B) (4) change cord connector to fitting as shown below:(4) Be terminated with a listed dusttight cord fitting connector.Under 505.17(5) change cord connector to fitting as shown below:(5) Be terminated with a listed cord fitting connector that maintains the type of protection where the flexible cord enters

boxes, fittings, or enclosures that are required to be explosionproof or flameproof.Under 506.17(5) change cord connector to fitting as shown below:(5) Be terminated with a listed cord fitting connector that maintains the protection technique of the terminal

compartment.NOTE: Separate comments were submitted for each of the respective sections shown above to comply with the Style

Manual.This proposal was offered to attempt to correct the incorrect use of the term ‘connector’. However the

action taken simply makes this problem more unclear as the term ‘cord connector’ is not appropriate in this case and adifferent term that includes the word "fitting" should be used as part of the term, not to describe something different. Theaction addressed in the proposed text revisions provides appropriate solutions.

ANSI/UL 514B is not limited for use in hazardous (classified) areas. The term fitting is widely used in UL productstandards to refer to these and other types of products that are used to secure wiring methods and cords to equipment.The actual title of UL 514B uses the term fittings, not connectors "Conduit, Tubing, and Cable Fittings". Section 1.2 ofUL 514B uses the phrase "fittings for flexible cord" Interestingly 1.4 states "These requirements do not cover FITTINGSintended for use in hazardous locations as defined in the National Electrical Code, ANSI/NFPA 70, the CanadianElectrical Code (CEC), Part I, CSA C22.1, and the Standard for Electrical Installations, NOM-001-SEDE."

The term cord connector is used in other places in the NEC as a wiring device such as in 210.50(A) where it permits a"cord connector" to be considered a receptacle outlet. Section 626.2 defines a cord connector as a device forestablishing a connection. The term fitting is commonly used in the NEC and product standards related to flexible cordsproducts that are attached to enclosures. Section 400.7(B) uses the term cord connector body as device used toenergize an attachment plug.

The term "cord fitting" as indicated should be used in sections 501.140(B)(4), 502.140(4), 503.140(4), 505.17(5),506.17(5) and anywhere else the term is used to describe the fitting.

As presently used in these articles the term cord connector is confusing whether the term is defined differently (for nogood reason) or not. The term "cord connector" is commonly used in the field to describe a wiring device that isconnected to a cord.

Users of Chapter 5 are not exempt from the requirements in Chapters 1 through 4, chapter 5 requirements cansupplement or modify the general rules but creating using the same term to define different items should not be doneand will create confusion and likely misinterpretation of the associated requirements.

The term "fitting" is used in many other NEC sections to describe the product used to secure a cord to an enclosure.

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The term "cord fitting" as indicated should be used in sections 501.140(B)(4), 502.140(4), 503.140(4), 505.17(5),506.17(5) and anywhere else the term is used to describe the fitting.As presently used in these articles the term cord connector is confusing whether the term is defined differently (for no

good reason) or not. The term "cord connector" is commonly used in the field to describe a wiring device that isconnected to a cord.



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_______________________________________________________________________________________________Eliana Brazda, ISA

14-10Revise text to read as follows:

ANSI/ISA-12.12.01-20112, Nonincendive Electrical Equipment for Use in Class I and II, Division 2, and Class III,Divisions 1 and 2 Hazardous (Classified) Locations.

Change the ISA standards date of publication to the current publication date.

_______________________________________________________________________________________________14-5 Log #489 NEC-P14

_______________________________________________________________________________________________Marcelo M. Hirschler, GBH International

14-11aRevise text to read as follows:Finely divided solid particles that present a dust fire or dust explosion hazard when dispersed and

ignited in air. (499-2013)Any finely divided solid material that is 420 microns (0.017 in.) or smaller in diameter (material

passing a U.S. No. 40 Standard Sieve) and presents a fire or explosion hazard when dispersed and ignited in air. [2008]

Standards Council issued 499-2013 and it includes the updated definition of “combustible dust” asindicated in this comment. This definition was adopted as a result of a successful NITMAM at the June 2012 AnnualMeeting and the resulting Standards Council decision D#12-13 upholding the action of the assembly. The NEC shouldadopt the updated definition of a key concept.The existing definition in the NEC (and the proposed definition in the ROP) contains requirements that are unacceptablein NEC definitions. Note that the NEC TCC highlights one of the problems with the ROP proposed definition (use ofASTM and ISO standards).

_______________________________________________________________________________________________14-6 Log #573 NEC-P14

_______________________________________________________________________________________________

Code-Making Panel 14,14-11a

In 500.2 replace the current definition of Combustible Dust with the following:Combustible Dust. Dust particles of 500 microns or smaller (material passing a U.S. No. 35 Standard Sieve as defined

in ASTM E 11, Standard Specification for Wire Cloth and Sieves for Testing Purposes) are considered to present a dustfire or dust explosion hazard unless determined otherwise. (See ASTM E 1226 or ISO 6184/1). [499:3.3.3]

Definition is extracted from NFPA 499 and the definition in the 2012 Edition of NFPA 499 has beenrevised.

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14-111Revise the definition of Electrical and Electronic Equipment as follows:

Electrical and Electronic Equipment. Materials, fittings, devices, appliances, and the like that are part of, or inconnection with, an electrical installation, or portable or transportable equipment having self-contained power supplies,such as battery-operated equipment, which could potentially become an ignition source in hazardous (classified)locations.

FPN: Portable or transportable equipment having self-contained power supplies, such as battery-operated equipment,could potentially become an ignition source in hazardous (classified) locations. See ISA-RP12.12.03-2002, PortableElectronic Products Suitable for Use in Class I and II, Division 2, Class I Zone 2 and Class III, Division 1 and 2Hazardous (Classified) Locations.

This comment was developed on the basis of existing texts in the current NEC and the CMP-14Technical substantiation to Proposal Log 14-111 Log #1754 stating in part “The proposed language belongs in a productstandard, not in an installation Code.” While an argument may be made that overall the intent of the NEC is to addressinstallations, as in the general requirements of Chapters 1-4, Chapter 5 addresses special occupancies and theseencompass a different scope. The NEC Chapter 5 states “500.1 Scope — Articles 500 Through 504

Articles 500 through 504 cover the requirements for electrical and electronic equipment and wiring for all voltages inClass I, Divisions 1 and 2; Class II, Divisions 1 and 2; and Class III, Divisions 1 and 2 locations where fire or explosionhazards may exist due to flammable gases, flammable liquid– produced vapors, combustible liquid–produced vapors,combustible dusts, or ignitible fibers/flyings.”

This scope does not state ‘installation only’. Additionally the defined equipment protection methods say nothing aboutthe designs being only for fixed/connected by cord or cable installations or usage and not applicable to portable ortransportable equipment having power supplies.

If the position of the Panel is that portables and transportable having self contained power supplies are not addressedunder Chapter 5, then where are the requirements and the protection designs for portable electrical/electronicequipment found? What basis can there be to have portable devices marked in accordance with the requirements of theNEC, if the NEC has no requirements? How can listings/approvals be made for unregulated equipment designs?

The revision provided addresses this important issue. Please also see the NEC structure as contained on page 5(Figure 90.3) of the 2011 NEC Handbook which properly reflects that Chapter 5 is either supplements or modifies thebasic Chapters 1-4 of the NEC with the requirement in Chapter 5 beginning with essentially locations shall beclassified… for electrical and electronic equipment and wiring for all voltages in Class I, .... where fire or explosionhazards may exist...:

_______________________________________________________________________________________________14-8 Log #1599 NEC-P14

_______________________________________________________________________________________________Mark Goodman, Mark Goodman Electrical Consulting


ANSI/API RP500 1997 2012,

This and the companion Comment propose to update the date references to ANSI/API RP 500. Thelatest edition of ANSI/API RP 500 has been approved and released by API.

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_______________________________________________________________________________________________Mark Goodman, Mark Goodman Electrical Consulting


ANSI/API RP500 1997 2012,

This and the companion Comment propose to update the date references to ANSI/API RP 500. Thelatest edition of ANSI/API RP 500 has been approved and released by API.

_______________________________________________________________________________________________14-10 Log #313 NEC-P14

_______________________________________________________________________________________________Frank W. Peri, Communications Cable & Connectivity Assoc.


(e) Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall bepermitted to be installed in raceways as stated in 501.10(A). These Fiber Optic optical fiber cables shall be sealed inaccordance with 501.15.

This is an editorial comment. Terminology should be consistent throughout the code. Article 770covers optical fiber cables not fiber optic cables. There are many places this change needs to be made to correlate withArticle 770.

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_______________________________________________________________________________________________William E. McBride, Northern Electric Company

14-33Modify existing Text:

(I) General. In Class I, Division I locations, the wiring methods in (a) through (e) shall be permitted.Add new text(g) In industrial establishments with restricted public access, where the conditions of maintenance and supervisionensure that only qualified persons service theinstallation, and where the cable is not subject to physical damage listed Type TC-ER-HL Cable, up to I inch in diameter,that complies with the crush and impactrequirements of Type MC HL cable,and is identified for such use with the marking Type TC-ER-HL shall be permitted.The cable shall contain separate equipmentbonding conductor(s) in accordance with 250. 122, and terminated with fittings listed for the application. Type TC-ER-HLCable shall be installed in accordance withthe provisions of TC-ER Cable in Article 336.

Existing small diameter MC-HL cables that arc run between enclosures and instruments are easilykinked during initial installation and routine maintenance. The riskof ignition is not from the middle of cables, but from the devices and rerminations of cables where the conductor isexposed.

If the Code Making panel thinks it necessary they might further restrict the circuit voltage of these TGER-J-IL Cables tobe restricted to less than half of the conductorinsulation voltage rating. The application is mostly for 24 volt instrumentation, but may also include some 120 voltutilization devices, yet the cable is rated for 600volts.

_______________________________________________________________________________________________14-12 Log #314 NEC-P14



Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permittedto be installed in cable trays or any other raceway as stated in 501.10(B). Fiber Optical fiber cables shall be sealed inaccordance with 501.15.


_______________________________________________________________________________________________14-13 Log #183 NEC-P14

_______________________________________________________________________________________________Technical Correlating Committee on National Electrical Code®,

14-37aThe Correlating Committee directs that the panel reconsider the language in this proposal and

Proposal 14-38 and correlate the language.This is a direction from the National Electrical Code Technical Correlating Committee in accordance

with 3.4.2 and 3.4.3 of the Regulations Governing Committee Projects.

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14-38The Correlating Committee directs that the panel reconsider the language in this proposal and

Proposal 14-37a and correlate the language.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-15 Log #185 NEC-P14


14-44The Correlating Committee directs the panel to review the entire text of 501.15 for consistency with

respect to using complete sentences.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-16 Log #449 NEC-P14

_______________________________________________________________________________________________William Fiske, Intertek

14-46Reverse CMP-14 action on Proposal 14-46 and return to the language in NEC 2011.

The authority having jurisdiction would not be able to determine whether or not a seal complies with theproposed requirements, as AHJs do not possess the equipment or the expertise needed to test seals in the field. Asstated in NEC 90.7, [listing] “avoids the necessity for repetition of examinations by different examiners, frequently withinadequate facilities for such work …” Adding a leak rate specification for seals would create a de facto requirement forlisting, yet the submitter’s substantiation does not indicate that listing of seals is necessary. Note also that the existinglanguage of 501.15(A)(4), covering seals at a Class I Division 1 boundary, does not include a requirement for listedseals, does not contain a leak rate specification, and none has been proposed for 501.15(A)(4).

_______________________________________________________________________________________________14-17 Log #186 NEC-P14


14-50The Correlating Committee directs the panel to reconsider Proposals 14-50 and 14-51 which were

accepted with conflicting text in the second sentence of (1).This is a direction from the National Electrical Code Technical Correlating Committee in accordance


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14-51The Correlating Committee directs the panel to reconsider Proposals 14-50 and 14-51 which were

accepted with conflicting text in the second sentence of (1).This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-19 Log #374 NEC-P14

_______________________________________________________________________________________________Robert A. Jones, Independent Electrical Contractors, Inc.

14-56aRevise text to read as follows:

Regardless of the voltage of the electrical system, wiring and equipment in Class I, Division 1 and 2 locations shall begrounded as specified in Article 250 and in accordance with the requirements of 501.30(A) and (B).

CMP 14 had a long discussion about deleting the informational note about referring to 250.100. Duringthe discussion the phrase “regardless of the voltage of the electrical system” was considered important to minimize thepossibility of an ignition; however Proposal 14-56a did not insert these words in the sections affected.

_______________________________________________________________________________________________14-20 Log #188 NEC-P14


14-61It was the action of the Correlating Committee that this proposal be reconsidered and correlated

with the action taken on Proposal 1-114.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-21 Log #373 NEC-P14

_______________________________________________________________________________________________Robert A. Jones, IEC Texas Gulf Coast


A switch complying with 501.105(B)(1) is provided so that the attachment plug is not depended on to interrupt current.,unless the circuit is nonincendive field wiring, in which case the switch is not required.

Action taken by CMP 14 on this proposal is not in accordance with the National Electrical Code® stylemanual. The added phrase is really an exception to the previous phrase.

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14-66The Correlating Committee directs that the panel rewrite this Informational Note to eliminate the

following phrase "…it is important to consider the risk of…" which is in violation of 3.1.3 of the NEC Style Manual.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-23 Log #512 NEC-P14

_______________________________________________________________________________________________Edward M. Briesch, UL LLC

14-72Accept Proposal 14-72. Revise the Exception to 501.130(B)(4) as follows:

Portable lighting equipmentshall comply with 501.130(A)(1).

This proposal should be accepted. It does not, as the Panel Statement indicates, reduce the level ofprotection from Division 1 to Division 2. This exception first appears in the 1984 NEC in 501-9(b)(1). The exceptionstates that portable lighting equipment in Class I, Division 2 need not comply with the requirements for Class I, Division1 if it complies with “Section 501-9(b)(2) below”. Section 501-9(b)(2) of the 1984 NEC details the requirements for fixedlighting in Class I, Division 2. Those requirements now are found in 501.130(B)(1).The intent of Proposal 14-72 is toclarify that this was indeed the case.A review of Proposal 14-62 for the 1984 NEC and the resultant action of the Panel as documented in the NationalElectrical Code Technical Committee Report for the 1984 NEC clearly indicates that the intent of the proposal was topermit portable lighting on moveable stands and connected by cord to comply with the Division 2 requirements insteadof the Division 1 requirements. The submitter’s substantiation for Proposal 14-62 also states that this was needed fortemporary lighting during periods of maintenance but at that time the Panel chose not to limit the usage in this way. Thefinal wording was modified to conform to the style manual by Comment 14-75 from the NEC Correlating Committee.

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action taken simply makes this problem more unclear as the term ‘cord connector’ is not appropriate in this case and adifferent term that includes the word "fitting" should be used as part of the term, not to describe something different. Theaction addressed in the proposed text revisions provides appropriate solutions. ANSI/UL 514B is not limited for use in hazardous (classified) areas. The term fitting is widely used in UL productstandards to refer to these and other types of products that are used to secure wiring methods and cords to equipment.The actual title of UL 514B uses the term fittings, not connectors "Conduit, Tubing, and Cable Fittings". Section 1.2 ofUL 514B uses the phrase "fittings for flexible cord" Interestingly 1.4 states "These requirements do not cover FITTINGSintended for use in hazardous locations as defined in the National Electrical Code, ANSI/NFPA 70, the CanadianElectrical Code (CEC), Part I, CSA C22.1, and the Standard for Electrical Installations, NOM-001-SEDE." The term cord connector is used in other places in the NEC as a wiring device such as in 210.50(A) where it permits a"cord connector" to be considered a receptacle outlet. Section 626.2 defines a cord connector as a device forestablishing a connection. The term fitting is commonly used in the NEC and product standards related to flexible cordsproducts that are attached to enclosures. Section 400.7(B) uses the term cord connector body as device used toenergize an attachment plug. The term "cord fitting" as indicated should be used in sections 501.140(B)(4), 502.140(4), 503.140(4), 505.17(5),506.17(5) and anywhere else the term is used to describe the fitting. As presently used in these articles the term cord connector is confusing whether the term is defined differently (for nogood reason) or not. The term "cord connector" is commonly used in the field to describe a wiring device that isconnected to a cord. Users of Chapter 5 are not exempt from the requirements in Chapters 1 through 4, chapter 5 requirements cansupplement or modify the general rules but creating using the same term to define different items should not be doneand will create confusion and likely misinterpretation of the associated requirements. The term "fitting" is used in many other NEC sections to describe the product used to secure a cord to an enclosure.

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Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permittedto be installed in raceways as stated in 502.10(A). Fiber Optical fiber cables shall be sealed in accordance with 502.15.


_______________________________________________________________________________________________14-26 Log #316 NEC-P14



Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permittedto be installed in cable trays or any other raceway as stated in 502.10(B). Fiber Optical fiber cables shall be sealed inaccordance with 502.15.


_______________________________________________________________________________________________14-27 Log #190 NEC-P14


14-88aThe Correlating Committee directs that the panel clarify the location of the list item

This is a direction from the National Electrical Code Technical Correlating Committee in accordancewith 3.4.2 and 3.4.3 of the Regulations Governing Committee Projects.

_______________________________________________________________________________________________14-28 Log #375 NEC-P14



Regardless of the voltage of the electrical system, wiring and equipment in Class II, Division 1 and 2 locations shall begrounded as specified in Article 250 and in accordance with the requirements of 502.30(A) and (B).


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_______________________________________________________________________________________________John Masarick, Independent Electrical Contractors, Inc.

14-93I ask the panel to continue to reject this proposal. The proposal which would change 600 volts to

1000 volts.Replacing 600 volts with 1000 volts will have a major impact on installers, component manufacturers,

and industry standards. Increased spacing must be considered when going from 600 volts to 1000 volts. Personalsafety must also be considered.Because the proposer has not provided enough information to the public to justify and understand all the ramifications ofthe proposal, the committee should continue to reject the original submitters proposal.

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action taken simply makes this problem more unclear as the term ‘cord connector’ is not appropriate in this case and adifferent term that includes the word "fitting" should be used as part of the term, not to describe something different. Theaction addressed in the proposed text revisions provides appropriate solutions. ANSI/UL 514B is not limited for use in hazardous (classified) areas. The term fitting is widely used in UL productstandards to refer to these and other types of products that are used to secure wiring methods and cords to equipment.The actual title of UL 514B uses the term fittings, not connectors "Conduit, Tubing, and Cable Fittings". Section 1.2 ofUL 514B uses the phrase "fittings for flexible cord" Interestingly 1.4 states "These requirements do not cover FITTINGSintended for use in hazardous locations as defined in the National Electrical Code, ANSI/NFPA 70, the CanadianElectrical Code (CEC), Part I, CSA C22.1, and the Standard for Electrical Installations, NOM-001-SEDE." The term cord connector is used in other places in the NEC as a wiring device such as in 210.50(A) where it permits a"cord connector" to be considered a receptacle outlet. Section 626.2 defines a cord connector as a device forestablishing a connection. The term fitting is commonly used in the NEC and product standards related to flexible cordsproducts that are attached to enclosures. Section 400.7(B) uses the term cord connector body as device used toenergize an attachment plug. The term "cord fitting" as indicated should be used in sections 501.140(B)(4), 502.140(4), 503.140(4), 505.17(5),506.17(5) and anywhere else the term is used to describe the fitting. As presently used in these articles the term cord connector is confusing whether the term is defined differently (for nogood reason) or not. The term "cord connector" is commonly used in the field to describe a wiring device that isconnected to a cord. Users of Chapter 5 are not exempt from the requirements in Chapters 1 through 4, chapter 5 requirements cansupplement or modify the general rules but creating using the same term to define different items should not be doneand will create confusion and likely misinterpretation of the associated requirements. The term "fitting" is used in many other NEC sections to describe the product used to secure a cord to an enclosure.

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Regardless of the voltage of the electrical system, wiring and equipment in Class III, Division 1 and 2 locations shall begrounded as specified in Article 250 and in accordance with the requirements of 503.30(A) and (B).


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14-112The Correlating Committee understands that the date references to the ISA Standards are to

remain as shown in the panel action.Furthermore, it was the action of the Correlating Committee that this proposal be reconsidered and correlated with the

action taken on Proposal 14-117.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-34 Log #490 NEC-P14



Apparatus in which the circuits are not necessarily intrinsically safe themselves but that affectthe energy in the intrinsically safe circuits and are relied on to maintain intrinsic safety. Examples of such Associatedapparatus are may be either of the following:(1) Electrical apparatus that has an alternative-type protection for use in the appropriate hazardous (classified) location(2) Electrical apparatus not so protected that shall not be used within a hazardous (classified) location

I accept the concept that NEC definitions are not required to be in single sentences. However thisdefinition contains the defined term in the last sentence and the NEC manual of style does not permit the definition tocontain the defined term. Definitions are not requirements. The proposed changes eliminate the defined term.Alternatively CMP 14 might want to place the examples in an alternate suitable location in Article 504 as a requirement.The NEC Manual of Style states as follows:

Definitions. Definitions shall be in alphabetical order and shall not contain the term that is being defined.Definitions shall not contain requirements or recommendations.

_______________________________________________________________________________________________14-35 Log #897 NEC-P14


14-111Insert the following new text in 504.4:

504.4 Equipment. All intrinsically safe apparatus and associated apparatus shall be listed.Testing for energy for intrinsically safe circuits shall be permitted to utilize a factor of 1.5 applied to energy or, both 1.5

applied to voltage and 1.5 applied to current.Exception: Simple apparatus, as described on the control drawing, shall not be required to be listed.504.10 Equipment Installation.

In the Panel Statement the Panel states that there are at least two US documents on intrinsic safety andthis suggests that either would be acceptable for use. This comment addresses currently a major issue dealing withenergy and the factor being considered and merely affirms this acceptable use within the NEC.

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cord fitting connector installed with a seal listed for the location. In Division 2 locations, the cord shall be terminated witha listed dusttight cord fitting connector.Under 503.140 (B) (4) change cord connector to fitting as shown below:(4) Be terminated with a listed dusttight cord fitting connector.Under 505.17(5) change cord connector to fitting as shown below:(5) Be terminated with a listed cord fitting connector that maintains the type of protection where the flexible cord enters











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14-136aThe Correlating Committee directs that the panel clarify the action on this proposal.

The Correlating Committee notes that this proposal incorporates changes in the first sentence that were not identified inlegislative format.


_______________________________________________________________________________________________14-39 Log #194 NEC-P14


14-139It was the action of the Correlating Committee that the panel reconsider this proposal. The third

sentence of the Informational Note contains a recommendation which does not comply with 3.1.3 of the NEC StyleManual.


_______________________________________________________________________________________________14-40 Log #1284 NEC-P14

_______________________________________________________________________________________________William G. Lawrence, Jr., S. Yarmouth, MA

14-141Add new text to read as follows:

|Proposed as normative text based on comment:- The available short circuit current for electrical

equipment using type of protection “e” for the field wiring connections in Zone 1 locations shall be limited to 10,000 rmssymmetrical amperes to reduce the likelihood of ignition of a flammable atmosphere by an arc during a short circuitevent.

The short circuit current rating of terminals and terminal blocks, according to ANSI/UL 508A, is 10,000rms symmetrical amperes unless otherwise evaluated. To align with the ratings of these components, the availableshort circuit current should be limited to corresponding values. This is consistent with the approach in Article 409 forindustrial control panels. The addition of this requirement to 505.7 is necessary as these terminals are used in manyapplications other than industrial control panels.

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14-160The Correlating Committee directs that the panel reconsider the actions taken on this proposal.

The Correlating Committee notes that the panel omitted the last sentence of 505.15(B)(1)(b) without identifying this asa change.


_______________________________________________________________________________________________14-42 Log #317 NEC-P14



(e) Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall bepermitted to be installed in raceways as stated in 505.15(B). These Fiber Optic optical fiber cables shall be sealed inaccordance with 505.16.


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_______________________________________________________________________________________________Donald W. Ankele, UL LLC

14-164The Panel Action should be Accept in Principle.

CMP 14 Task Group on 14-164 proposes a new 505.15(B)(1)(g) as follows:(g) In industrial establishments with restricted public access, where the conditions of maintenance and supervision

ensure that only qualified persons service the installation, and where the cable is not subject to physical damage, TypeTC-ER-HL cable listed for use in Class I, Zone 1 locations with an overall jacket of suitable material and terminated withfittings listed for the location.

Informational Note: See 336.10(7) for restrictions on the installation of Type TC-ER cable.

The wiring methods currently permitted by 505.15(B)(1) are not always well suited for connection toelectrical equipment employing many of the Zone 1 types of protection.

Because Zone 1 is not as onerous as Division 1, as Division 1 encompasses conditions that constitute both Zone 0 andZone 1, meeting the -HL crush and impact performance requirements without requiring an armor constructionrequirements is acceptable because of the lower level of the risk of a flammable atmosphere being present, combinedwith the installation requirements in Section 336.10(7) for TC-ER cable that require continuous support and mechanicalprotection for Type TC-ER cable.

Proposal 14-164 to add Type TC-HL cable that is dual listed as Shipboard cable into 505.15 is not viable because noinstallation requirements exist in Chapter 3 for Shipboard cable, whereas Type TC-ER which is intended for installationin industrial establishments has installation requirements currently found in Article 336. Listed termination fittingscurrently exist for both flameproof “d” and increased safety “e” types of protection.Type TC-ER-HL cable will be required meet the crush and impact resistance requirements for -HL cables that is alreadyestablished in ANSI/UL 2225 for Type MC-HL, and Type ITC-HL; however, a metal sheath or armor will not be requiredfor TC-ER-HL. Data show that some current Type TC-ER cables meet or exceed the UL 2225 Type MC-HL and TypeTC-HL requirements.

This comment was prepared by a Task Group consisting of Don Ankele, convener, and the following members of CodeMaking Panel 14: Bill Fisk, Bill Lawrence, Will McBride, Richard Holub, Jack Jamison, and John Simmons.

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_______________________________________________________________________________________________William E. McBride, Northern Electric Company

14-164Modify existing Text:

(1) General. In Class I, zone I locations, the wiring methods in 8(1)(8) through (8)(I)(g) shall be permitted.Add new text(g) In industrial establishments with restricted public access, where the conditions of maintenance and supervisionensure that only qualified persons service theinstallation, and where the cable is not subject to physical damage listed Type TC-ER-HL Cable, up to I inch in diameter,that complies with the crush and impactrequirements of Type MC-HL cable, and is identified for such use with the marking Type TC-ER-HL shall be permitted.The cable shall contain separate equipmentbonding conductor(s) in accordance with 250.119, and terminated with fittings listed for the application. Type TC-ER·HLCable shall be installed in accordance withthe provisions of TC·ER Cable in Article 336.

Existing small diameter MC·HL cables that are run between enclosures and instruments are easilykinked during initial installation and routine maintenance. The riskof ignition is not from the middle of cables, but from the devices and rerminations of cables where the conductor isexposed.

If the Code Making panel thinks it necessary they might further restrict the circuit voltage of these TG-ER-HL Cables tobe restricted to less than half of the cond uctorinsulation voltage rating. The application is mostly for 24 volt instrumentation, but may also include some 120 voltutilization devices, yet the cable is rated for 600volts.

_______________________________________________________________________________________________14-45 Log #318 NEC-P14



Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permittedto be installed in cable trays or any other raceway as stated in 505.15(C). Fiber Optical fiber cables shall be sealed inaccordance with 502.16.


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_______________________________________________________________________________________________Edward M. Briesch, UL LLC

14-180In 505.17(B)(1) as documented in the Panel Meeting Action for Proposal 14-180, revise text as

follows:Instrumentation Connections for Zone 2. To facilitate replacements, process control instruments shall be

permitted to be connected through flexible cord, attachment plug, and receptacle, provided all of the following conditionsapply:(1) A switch listed identified for Zone 2 is provided so that the attachment plug is not depended on to interrupt current,unless the circuit is type of protection “ia, ib, or ic” then the switch shall is not be required.

In 505.17(B)(1) the switch should be required to be “listed” and not “identified”. Equipment in Zone 2locations is required to be listed by 505.20(C) and there was no technical rationale provided in the Proposal or PanelStatement to take an exception to that requirement. Also, the end of the sentence was modified to conform to the StyleManual.

_______________________________________________________________________________________________14-47 Log #196 NEC-P14


14-185The Correlating Committee directs that the panel reconsider this Informational Note to eliminate the

following phrase "…it is important to consider the risk of…" which is in violation of 3.1.3 of the NEC Style Manual.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-48 Log #377 NEC-P14



Regardless of the voltage of the electrical system, grounding and bonding shall comply with Article 250 and therequirements in 505.25(A) and (B).


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14-190aRestore the following last sentence under 506.1 Scope:

Combustible metallic dusts are not covered by the requirements of this article.The statement in this Article is correct. The Proposal action was based upon ANSI/ISA standard

60079-0. However, the ISA Standard 60079-0 which is a draft is taking a US deviation from the IEC 60079-0 standardby replacing that term ‘conductive’ with metal which differs from that found in its Group IIIC definition. The IEC 60079-0standard under 3.18.1.1 defines as ‘combustible dust with electrical resistivity equal to or less than 103

ohm m’. There also is a note: “Note: IEC 61241-2-2 contains the test method for determining the electrical resistivity ofdusts.” which suggests that a simple replacement of the term ‘metal’ for ‘conductive’ may not reflect the same potentialhazards. The NEC rejected defining combustible dust using resistivity.

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_______________________________________________________________________________________________Eliana Brazda, ISA


ANSI/ISA-12.12.01-20112, Nonincendive Electrical Equipment for Use in Class I and II, Division 2, and Class III,Divisions 1 and 2 Hazardous (Classified) Locations.

Change the ISA standards date of publication to the current publication date.

_______________________________________________________________________________________________14-52 Log #491 NEC-P14



Apparatus in which the circuits are not necessarily nonincendivethemselves but that affect the energy in nonincendive field wiring circuits and are relied upon to maintain nonincendiveenergy levels. Associated nonincendive field wiring Examples of such apparatus are may be either of the following:(1) Electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified)location(2) Electrical apparatus not so protected that shall not be used in a hazardous (classified) location

Associated nonincendive field wiring apparatus has designated associated nonincendive field wiringapparatus connections for nonincendive field wiring apparatus and may also have connections for other electricalapparatus.

I accept the concept that NEC definitions are not required to be in single sentences. However thisdefinition contains the defined term in the last sentence and the NEC manual of style does not permit the definition tocontain the defined term. Definitions are not requirements. The proposed changes eliminate the defined term.Alternatively CMP 14 might want to place the examples in an alternate suitable location in Article 506 as a requirement.The NEC Manual of Style states as follows:

Definitions. Definitions shall be in alphabetical order and shall not contain the term that is being defined.Definitions shall not contain requirements or recommendations.

_______________________________________________________________________________________________14-53 Log #574 NEC-P14

_______________________________________________________________________________________________

Code-Making Panel 14,14-192a

In 506.2 replace the current definition of Combustible Dust with the following:Combustible Dust. Dust particles of 500 microns or smaller (material passing a U.S. No. 35 Standard Sieve as defined

in ASTM E 11, Standard Specification for Wire Cloth and Sieves for Testing Purposes) are considered to present a dustfire or dust explosion hazard unless determined otherwise. (See ASTM E 1226 or ISO 6184/1). [499:3.3.3]

Definition is extracted from NFPA 499 and the definition in the 2012 Edition of NFPA 499 has beenrevised.

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with the action on Proposal 14-194.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-55 Log #198 NEC-P14





_______________________________________________________________________________________________14-56 Log #893 NEC-P14


14-200aDelete new 506.6 and renumber accordingly.

First the Committee under Log 14-111 stated that some language in a Product Standard belongs in aproduct standard and not an installation code, like the NEC. Claiming that product standards include a marking of thedust group, does not provide substantiation to reflect the basis for these specific defined terms in the NEC.

IEC and ISA use the terms “Group IIIC, IIIB and IIIA”. However these terms have different definitions. For example theIEC 60079-0 standard under paragraph 4.3 defines Group IIIC as: “conductive dust” and under 3.18.1.1 definesconductive dust as ‘combustible dust with electrical resistivity equal to or less than 103 ohm m.’ There also is a note:“Note: IEC 61241-2-2 contains the test method for determining the electrical resistivity of dusts.” which suggests that asimple replacement of the term ‘metal’ for ‘conductive’ may not reflect the same potential hazards.

The ISA 60079-0 draft standard under paragraph 4.3 contains Note 2, a US deviation from the IEC standard, whichstates: “The 2011 NEC does not recognize the identification of location or equipment as ‘Group IIIA, IIIB, or IIIC’, butidentifies equipment suitable for Zone 20, 21 and 22 and no separate differentiation is made of combustible dusts orignitable fibers.”

Lastly based upon the NFPA Standards Council, Jan. 1995, 95-6 ruling, it is the responsibility for group classification ofmaterials to the Technical Committee on Electrical Equipment in Chemical Atmospheres (EECA) and not the NECCMP-14. NFPA 499 which is under the EECA does not include these defined terms.

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14-204aDelete 506.9( C)(1) and re-number accordingly.


Second, the NFPA Standards Council, Jan. 1995, 95-6 ruling, stated it is the responsibility for group classification ofmaterials to the Technical Committee on Electrical Equipment in Chemical Atmospheres (EECA) and not the NECCMP-14. NFPA 499 which is under the EECA does not include these defined terms.

_______________________________________________________________________________________________14-58 Log #895 NEC-P14


14-205aDelete 506.9( C) (2) and re-number accordingly.


Second, the NFPA Standards Council, Jan. 1995, 95-6 ruling, stated it is the responsibility for group classification ofmaterials to the Technical Committee on Electrical Equipment in Chemical Atmospheres (EECA) and not the NECCMP-14. NFPA 499 which is under the EECA does not include these defined terms.

_______________________________________________________________________________________________14-59 Log #319 NEC-P14



(e) Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall bepermitted to be installed in raceways as stated in 506.15(A). These Fiber Optic optical fiber cables shall be sealed inaccordance with 506.16.


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Fiber Optical fiber cables of the types OFNP, OFCP, OFNR, OFCR, OFNG, OFCG, OFN, and OFC shall be permittedto be installed in cable trays or any raceway as stated in 506.15(C). Fiber Optical fiber cables shall be sealed inaccordance with 506.16.


_______________________________________________________________________________________________14-61 Log #896 NEC-P14


14-225Delete new 520.6 (D) and renumber accordingly.

Again if the prior action to delete the Article 506 Groups is accepted because based upon the NFPAStandards Council, Jan. 1995, 95-6 ruling, it is the responsibility for group classification of materials to the TechnicalCommittee on Electrical Equipment in Chemical Atmospheres (EECA) and not the NEC CMP-14. NFPA 499 which isunder the EECA does not include these defined terms, then this action as stated in this proposal serves no purpose.

Also a was stated in the Panel Statement, Product Standard belongs in a product standard and not an installationcode, like the NEC. Claiming that product standards include a marking of the dust group, does not providesubstantiation to reflect the basis for these specific defined terms in the NEC.

IEC and ISA use the terms “Group IIIC, IIIB and IIIA”. However these terms have different definitions. For example theIEC 60079-0 standard under paragraph 4.3 defines Group IIIC as: “conductive dust” and under 3.18.1.1 definesconductive dust as ‘combustible dust with electrical resistivity equal to or less than 103 ohm m.’ There also is a note:“Note: IEC 61241-2-2 contains the test method for determining the electrical resistivity of dusts.” which suggests that asimple replacement of the term ‘metal’ for ‘conductive’ may not reflect the same potential hazards.

The ISA 60079-0 draft standard under paragraph 4.3 contains Note 2, a US deviation from the IEC standard, whichstates: “The 2011 NEC does not recognize the identification of location or equipment as ‘Group IIIA, IIIB, or IIIC’, butidentifies equipment suitable for Zone 20, 21 and 22 and no separate differentiation is made of combustible dusts orignitable fibers.”

Lastly based upon the NFPA Standards Council, Jan. 1995, 95-6 ruling, it is the responsibility for group classification ofmaterials to the Technical Committee on Electrical Equipment in Chemical Atmospheres (EECA) and not the NECCMP-14. NFPA 499 which is under the EECA does not include these defined terms.

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Regardless of the voltage of the electrical system, grounding and bonding shall comply with Article 250 and therequirements in 506.25(A) and (B).


_______________________________________________________________________________________________14-63 Log #199 NEC-P14





_______________________________________________________________________________________________14-64 Log #200 NEC-P14





_______________________________________________________________________________________________14-65 Log #201 NEC-P14





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14-243The Correlating Committee directs Code-Making Panel 14 to resolve correlation issues/conflicts

with NFPA 33 and NFPA 34 rather than refer to an outdated version of these two documents.The Correlating Committee advises that using outdated NFPA references is not permitted.See the Correlating Committee Note on Proposal 14-244.


_______________________________________________________________________________________________14-67 Log #1268 NEC-P14

_______________________________________________________________________________________________Donald W. Ankele, UL LLC

14-244The Panel Action should be Accept in Principle. CMP-14 Finishing Processes Committee Task

Group on 14-244 proposes a revised Article 516 as follows:

******Insert Include Here******For the 2011 NEC, the Informational Notes in Article 516 were revised to the 2011 editions of NFPA 33

and NFPA 34. The actual text in Article 516, however, remained the extracted text from 2007.Proposal 14-244 and others proposed partial revisions to 516, but no proposal addressed all of the parts of 516 thatwere 2007 extracted text.The TCC directed that a task group be formed consisting of members of CMP14 and the Committee on FinishingProcesses.This comment was prepared by a Task Group consisting of the following members:CMP14Don Ankele, UL, Task Group ChairBill Lawrence, FM GlobalJeremy Neagle, US Bureau of ATFEd Briesch, UL LLCFred Walker , US Department of the Air Force

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FORM FOR COMMENT FOR 2014 NATIONAL ELECTRICAL CODE®

INSTRUCTIONS — PLEASE READ CAREFULLY Type or print legibly. Use a separate copy for each comment. Limit

each comment to a SINGLE section. All comments must be received by NFPA by

5 p.m., EDST, Wednesday, October 17, 2012, to be considered for the 2014 National

Electrical Code. Comments received after 5:00 p.m., EDST, Wednesday, October 17, 2012,

will be returned to the submitter.

For technical assistance, please call NFPA at 1-800-344-3555.

FOR OFFICE USE ONLY

Log #:

Date Rec’d:

Please indicate in which format you wish to receive your ROP/ROC electronic paper download

(Note: If choosing the download option, you must view the ROP/ROC from our website; no copy will be sent to you.)

Date 10/17/2012 Name Don Ankele Tel. No. 847 664-2965

Company UL LLC Email [email protected]

Street Address 333 Pfingsten Rd. City Northbrook State IL Zip 60062

***If you wish to receive a hard copy, a street address MUST be provided. Deliveries cannot be made to PO boxes.

Please indicate organization represented (if any)

1. Section/Paragraph Article 516 (all)

2. Comment on Proposal No. (from ROP): 14-244

3. Comment recommends (check one): new text revised text deleted text

4. Comment (include proposed new or revised wording, or identification of wording to be deleted): [Note: Proposed text should be in

legislative format; i.e., use underscore to denote wording to be inserted (inserted wording) and strike-through to denote wording to be deleted

(deleted wording).

The Panel Action should be Accept in Principle. CMP 14/Finishing Processes Committee Task Group on 14-244 proposes a revised Article 516 as follows:

ARTICLE 516

Spray Application, Dipping, and Coating, and Printing Processes

Using Flammable or Combustible Materials

Staff Liaison’s Note: New text is shown underlined. Deleted text is shown shaded.

Informational Note: Text that is followed by a reference in brackets has been extracted from NFPA 33-2011, Standard for Spray Application Using Flammable and Combustible Materials, or NFPA 34-2011, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids. Only editorial changes were made to the

extracted text to make it consistent with this Code. 516.1 Scope. This article covers the regular or frequent application of flammable liquids, combustible liquids, and combustible powders by spray operations and the application of flammable liquids, or combustible liquids at temperatures above their flashpoint, by dipping, coating, printing or other means.

Informational Note: For further information regarding safeguards for these processes, such as fire protection, posting of warning signs, and maintenance, see NFPA 33-2011, Standard for Spray Application Using Flammable and Combustible Materials, and NFPA 34-2011, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids. For additional information regarding ventilation, see NFPA 91-2010, Standard for Exhaust

Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids. 516.2 Definitions. For the purpose of this article, the following definitions shall apply. Flash-Off Area. An open or enclosed area after a spray application process where vapors are released due to exposure to ambient air or a heated atmosphere. [33:3.3.1.1]

Limited Finishing Workstation. An apparatus that is capable of confining the vapors, mists, residues, dusts, or deposits that are generated by a spray application process and that meets the requirements of Section 14.3 of NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials, but does not meet the requirements of a spray booth or spray room, as herein defined. [33:3.3.15.1]

Resin Application Area. Any area in which polyester resins or gelcoats are spray applied. [33:3.3.1.2] Spray Area. Any fully enclosed, partly enclosed, or unenclosed area in which ignitable quantities of flammable or combustible vapors, mists, residues, dusts, or deposits are present due to the operation of spray processes,

including (1) any area in the direct path of a spray application process; (2) the interior of a spray booth or spray

room or limited finishing workstation, as herein defined; (3) the interior of any exhaust plenum, eliminator section, or scrubber section; (4) the interior of any exhaust duct or exhaust stack leading from a spray application process; (5) the interior of any air recirculation filter house or enclosure, including secondary recirculation particulate filters; (6) any solvent concentrator (pollution abatement) unit or solvent recovery (distillation) unit. The following are not

considered to be a part of the spray area: (1) fresh air make-up units; (2) air supply ducts and air supply plenums; Page 47 of 62

(3) recirculation air supply ducts downstream of secondary filters; (4) exhaust ducts from solvent concentrator

(pollution abatement) units. [33: 3.3.2.3] Informational Note: Unenclosed spray areas are normally locations outside of buildings or are localized operations within a larger room or space. Such are normally provided with some local vapor extraction/ventilation system. In automated operations, the area limits are shall be the maximum area in the direct path of spray operations. In

manual operations, the area limits are the maximum area of spray when aimed at 180 90 degrees to the application surface. Spray Booth. A power-ventilated enclosure for a spray application operation or process that confines and limits the escape of the material being sprayed, including vapors, mists, dusts, and residues that are produced by the spraying

operation and conducts or directs these materials to an exhaust system. [33:3.3.14]

Informational Note: A spray booth is an enclosure or insert within a larger room used for spray/coating/dipping applications. A spray booth may be fully enclosed or have open front or face and may include separate conveyor entrance and exit. The spray booth is provided with a dedicated ventilation exhaust but may draw supply air from the larger room or have a dedicated air supply.

Spray Room. A power-ventilated fully enclosed room used exclusively for open spraying of flammable or combustible materials. A spray room is a purposefully enclosed room built for spray/coating/dipping applications provided with dedicated ventilation supply and exhaust. Normally the room is configured to house the item to be painted, providing reasonable access around the item/process. Depending on the size of the item being painted, such

rooms may actually be the entire building or the major portion thereof. [33:3.3.15] Unenclosed Spray Area. Any spray area that is not confined by a limited finishing workstation, spray booth, or spray room, as herein defined. [33:3.3.2.3.2 ]

516.3 Classification of Locations. Classification is based on dangerous quantities of flammable vapors, combustible mists, residues, dusts, or deposits that are present or might be present in quantities sufficient to produce ignitable or explosive mixtures with air.

(A) Zone Classification of Locations.

(1) For the purposes of this Article, the Zone system of electrical area classification shall be applied as follows:

(a) The inside of open or closed containers or vessels shall be considered a Class I, Zone 0 location.

(a) A Class I, Division 1 location shall be permitted to be alternatively classified as a Class I, Zone 1 location.

(b) A Class I, Division 2 location shall be permitted to be alternatively classified as a Class I, Zone 2 location.

(c) A Class II, Division 1 location shall be permitted to be alternatively classified as a Zone 21 location.

(d) A Class II, Division 2 location shall be permitted to be alternatively classified as a Zone 22 location. [33: 6.2.2]

(2) For the purposes of electrical area classification, the Division system and the Zone system shall not be intermixed for any given source of release. [33:6.2.3]

(3) In instances of areas within the same facility classified separately, Class I, Zone 2 locations shall be permitted to abut, but not overlap, Class I, Division 2 locations. Class I, Zone 0 or Zone 1 locations shall not abut Class I,

Division 1 or Division 2 locations. [70:505.7(B)] [33:6.2.4]

(4) Open flames, spark-producing equipment or processes, and equipment whose exposed surfaces exceed the autoignition temperature of the material being sprayed shall not be located in a spray area or in any surrounding

area that is classified as Division 2, Zone 2, or Zone 22.

Exception: This requirement shall not apply to drying, curing, or fusing apparatus. [33:6.2.5]

(5) Any utilization equipment or apparatus that is capable of producing sparks or particles of hot metal and that is

located above or adjacent to either the spray area or the surrounding Division 2, Zone 2, or Zone 22 areas shall be of the totally enclosed type or shall be constructed to prevent the escape of sparks or particles of hot metal. [33: 6.2.6]

(B) (A) Class I, Division 1 or Class I, Zone 0 Locations. The following spaces shall be considered Class I,

Division 1, or Class I, Zone 0, as applicable:

(1) The interior of any open or closed container or vessel of a flammable liquid

(2) The interior of any dip tank or coating tank

Page 48 of 62

(3) The interior of any ink fountain, ink reservoir, or ink tank

Informational Note: For additional guidance and explanatory diagrams, see Chapter 6 4.3.5 of NFPA 33-2011, Standard for Spray Application Using Flammable or Combustible Materials, and Chapter 6 Sections 4.2, 4.3, and 4.4 of NFPA 34-2011, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids.

(C) (B) Class I, Division 1; Class I, Zone 1; or Class II, Division 1; or Zone 21 Locations. The following spaces shall be considered Class I, Division 1, or Class I, Zone 1, or Class II, Division 1, or Zone 21 locations, as applicable:

(1) The interior of spray booths and rooms except as specifically provided in 516.3(D).

(2) The interior of exhaust ducts.

(3) Any area in the direct path of spray operations.

(4) For open dipping and coating operations, all spaces within a 1.5-m (5-ft) radial distance from the vapor sources

extending from these surfaces to the floor. The vapor source shall be the liquid exposed in the process and the drainboard, and any dipped or coated object from which it is possible to measure vapor concentrations exceeding 25 percent of the lower flammable limit at a distance of 300 mm (1 ft), in any direction, from the object as in Figure

516.3(D)(6)(a).

(5) Sumps, pits, or belowgrade channels within 7.5 m (25 ft) horizontally of a vapor source. If the sump, pit, or channel extends beyond 7.5 m (25 ft) from the vapor source, it shall be provided with a vapor stop or it shall be classified as Class I, Division 1 for its entire length.

(6) All space in all directions outside of but within 900 mm (3 ft) of open containers, supply containers, spray gun cleaners, and solvent distillation units containing flammable liquids.

(7) For limited finishing workstations, the area inside the curtains or partitions. (See Figure 516.3(D)(5).)

(D) (C) Class I, Division 2; Class I, Zone 2; or Class II, Division 2; or Zone 22 Locations. The following spaces shall be considered Class I, Division 2; or Class I, Zone 2; or Class II, Division 2; or Zone 22 as applicable.

(1) Unenclosed Spray Processes Open Spraying. For unenclosed open spraying, all space outside of but within

6 m (20 ft) horizontally and 3 m (10 ft) vertically of the Class I, Division 1 or Class I, Zone 1 location as defined in

516.3(A) and not separated from it by partitions. See Figure 516.3(D)(C)(1) . [33:6.5.1]

(2) Closed-Top, Open-Face, and Open-Front Spraying Booths and Spray Rooms. If spray application operations are conducted within a closed-top, open-face, or open-front booth or room, as shown in Figure

516.3(D)(2), any electrical wiring or utilization equipment located outside of the booth or room but within 915mm (3 ft) of any opening the boundaries designated as Division 2 or Zone 2 in Figure 516.3(C)(2) shall be suitable for Class I, Division 2; Class I, Zone 2; or Class II, Division 2; or Zone 22 locations, whichever is applicable. The Class I,

Division 2; Class I, Zone 2; or Class II, Division 2; or Zone 22 locations shown in Figure 516.3(D)(C)(2) shall extend from the edges of the open face or open front of the booth or room in accordance with the following:

Informational Note: For both interlocked and non-interlocked exhaust ventilation systems, the Division 2, Zone 2 or Zone 22 location extends 915 mm (3 ft) horizontally and 915 mm (3 ft) vertically from the open face or open front of the booth or room, as shown in Figure 516.3(D)(2).

Figure 516.3(D)(C)(1) Electrical Area Classification for Unenclosed Open Spray Areas. [33:Figure 6.5.1]

Page 49 of 62

Figure 516.3(D)(C)(2) Class I, Division 2; Class I, Zone 2; or Class II, Division 2; or Zone 22 Locations Adjacent to a Closed Top, Open Face, or Open Front Spray Booth or Room. [33:Figure 6.5.2]

(a) If the exhaust ventilation system is interlocked with the spray application equipment, the Division 2 or Zone 2

location shall extend 1.5 m (5 ft) horizontally and 900 mm (3 ft) vertically from the open face or open front of the booth or room, as shown in Figure 516.3(C)(2), top.

(b) If the exhaust ventilation system is not interlocked with the spray application equipment, the Division 2 or Zone

2 location shall extend 3 m (10 ft) horizontally and 900 mm (3 ft) vertically from the open face or open front of the booth or room, as shown in Figure 516.3(C)(2), bottom.

For the purposes of this subsection, interlocked shall mean that the spray application equipment cannot be operated unless the exhaust ventilation system is operating and functioning properly and spray application is automatically

stopped if the exhaust ventilation system fails. [33:6.5.2.2]

(3) Open-Top Spraying Booths. For spraying operations conducted within an open top spray booth, the space 915mm 900 mm (3 ft) vertically above the booth and within 915mm 900 mm (3 ft) of other booth openings shall be

considered Class I, Division 2; Class I, Zone 2; or Class II, Division 2; or Zone 22. [33:6.5.3]

(4) Enclosed Spray Booths and Spray Rooms. For spraying operations confined to an enclosed spray booth or

Add “or Zone 21” and “or Zone

22” to respective legends

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room, electrical area classification shall be as follows: the space within 900 mm (3 ft) in all directions from any

openings shall be considered Class I, Division 2; or Class I, Zone 2; or Class II, Division 2 as shown in Figure 516.3(C)(4). [33:6.5.4]

(A) The area within 915 mm (3 ft) of any opening shall be classified as Class I, Division 2; Class I, Zone 2; Class II,

Division 2; or Zone 22 locations, whichever is applicable, as shown in Figure 516.3(D)(4) .

(B) Where exhaust air is recirculated both of the following shall apply:

(1) The interior of any recirculation path from the secondary particulate filters up to and including the air supply

plenum shall be classified as Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 locations, whichever

is applicable.

(2) The interior of fresh air supply ducts shall be unclassified.

(C) Where exhaust air is not recirculated, the interior of fresh air supply ducts and fresh air supply plenums shall be

unclassified.

Figure 516.3(D)(C)(4) Class I, Division 2; Class I, Zone 2; or Class II, Division 2; or Zone 22 Locations Adjacent to an Enclosed Spray Booth or Spray Room. [33:Figure 6.5.4]

(5) Limited Finishing Workstations. For limited finishing workstations, the area inside the 915 mm (3-ft) space horizontally and vertically beyond the volume enclosed by the outside surface of the curtains or partitions shall be classified as Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22, as shown in Figure 516.3(D)(5)

Figure 516.3(D)(5). Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 Locations Adjacent to a Limited Finishing Workstation. [33:Figure 14.3.5.1]

Page 51 of 62

(5) Tanks and Drain Boards — Surrounding Space. For dip tanks and drain boards, the 914-mm (3-ft) space

surrounding the Class I, Division 1 or Class I, Zone 1 location shall be as defined in 516.3(A)(4) and as shown in Figure 516.3(D)(C)(5). [34:6.4.4]

(6) Dip Tanks, and Drain Boards — Space Above Floor. For dip tanks, and drain boards, the space 900 mm (3

ft) above the floor and extending 6 m (20 ft) horizontally in all directions from the Class I, Division 1 or Class I, Zone 1 location.

Exception: This space shall not be required to be considered a hazardous (classified) location where the vapor

source area is 0.46 m2 (5 ft2) or less and where the contents of the open tank trough or container do not exceed 19 L (5 gal). In addition, the vapor concentration during operation and shutdown periods shall not exceed 25 percent of the lower flammable limit outside the Class I location specified in 516.3(B)(4). [34:6.4.4 Exception]

(6) Areas Adjacent to Open Dipping and Coating Processes. Electrical wiring and electrical utilization

equipment located adjacent to open processes shall meet the requirements of (a) through (c) and Figures 516.3(D)(6)(a), 516.3(D)(6)(b), 516.3(D)(6)(c), 516.3(D)(6)(d), or 516.3(D)(6)(e), whichever is applicable. [34:6.4]

(a) Electrical wiring and electrical utilization equipment located in any sump, pit, or below grade channel that is within 7620 mm (25 ft) horizontally of a vapor source, as defined by this standard, shall be suitable for Class I, Division 1 or Class I, Zone 1 locations. If the sump, pit, or channel extends beyond 7620 mm (25 ft) of the vapor

source, it shall be provided with a vapor stop, or it shall be classified as Class I, Division 1 or Class I, Zone 1 for its entire length. [34:6.4.1]

(b) Electrical wiring and electrical utilization equipment located within 1525 mm (5 ft) of a vapor source shall be suitable for Class I, Division 1 or Class I, Zone 1 locations. The space inside a dip tank, ink fountain, ink reservoir, or

ink tank shall be classified as Class I, Division 1 or Class I, Zone 0, whichever is applicable. [34:6.4.2]

(c) Electrical wiring and electrical utilization equipment located within 915 mm (3 ft) of the Class I, Division 1 or Class I, Zone 1 location described in 6.4.2 shall be suitable for Class I, Division 2 or Class I, Zone 2 locations,

whichever is applicable. [34:6.4.3]

(d) The space 915 mm (3 ft) above the floor and extending 6100 mm (20 ft) horizontally in all directions from the Class I, Division 1 or Class I, Zone 1 location described in 6.4.3 shall be classified as Class I, Division 2 or Class I,

Zone 2, and electrical wiring and electrical utilization equipment located within this space shall be suitable for Class I, Division 2 or Class I, Zone 2 locations, whichever is applicable. [34:6.4.4]

Exception: This space shall be permitted to be unclassified for purposes of electrical installations if the surface area of the vapor source does not exceed 0.5 m2 (5 ft2), the contents of the dip tank, ink fountain, ink reservoir, or ink

tank do not exceed 19 L (5 gal), and the vapor concentration during operating and shutdown periods does not exceed 25 percent of the lower flammable limit.

Figure 516.3(D)(6)(a)(C)(5) Electrical Area Classification for Open Dipping and Coating Processes

Page 52 of 62

Without Vapor Containment or Ventilation. [34:Figure 6.4(a)]

Figure 516.3(D)(6)(b)(C)(5) Electrical Area Classification for Open Dipping and Coating Processes With

Peripheral Vapor Containment and Ventilation – Vapors Confined to Process Equipment. [34:Figure

6.4(b)]

Figure 516.3(D)(6)(c)(C)(5) Electrical Area Classification for Open Dipping and Coating Processes With Partial Peripheral Vapor Containment and Ventilation – Vapors NOT Confined to Process Equipment.

[34:Figure 6.4(c)]

Page 53 of 62

Figure 516.3(D)(6)(d)(C)(5) Electrical Area Classification for Open Dipping and Coating Processes With Partial Peripheral Vapor Containment and Ventilation – Vapors Confined to Process Equipment.

[34:Figure 6.4(d)]

Figure 516.3(D)(6)(e)(C)(5) Electrical Area Classification for a Typical Printing Process. [34:Figure

6.4(e)]

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(7)(D) Enclosed Dipping and Coating Operations. Areas adjacent to enclosed dipping and coating processes

shall be classified in accordance with 516.3(D)(1) and Figure 516.3(D)(7). The space adjacent to an enclosed dipping or coating process or apparatus shall be considered unclassified. [34:6.5.3]

Exception: The space within 915 mm (3 ft) in all directions from any opening in the enclosures shall be classified as

Class I, Division 2 or Class I, Zone 2, as applicable. [34:6.5.2]

(1) The interior of any enclosed dipping or coating process or apparatus shall be a Class I, Division 1 or Class I, Zone 1 location, and electrical wiring and electrical utilization equipment located within this space shall be suitable

for Class I, Division 1 or Class I, Zone 1 locations, whichever is applicable. The area inside the dip tank shall be

classified as Class I, Division 1 or Class I, Zone 0, whichever is applicable. [34:6.5.1]

Figure 516.3(D)(7) Electrical Area Classification Around an Enclosed Dipping or Coating Process [34:Figure 6.5]

(8) Open Containers. All space in all directions within 600 mm (2 ft) of the Division 1 or Zone 1 area surrounding

open containers, supply containers, spray gun cleaners, and solvent distillation units containing flammable liquids, as well as the area extending 1.5 m (5 ft) beyond the Division 1 or Zone 1 area up to a height of 460 mm (18 in.) above the floor or grade level. [33:6.5.5 6.6.2]

(E) Adjacent Locations. Adjacent locations that are cut off from the defined Class I or Class II locations by tight

partitions without communicating openings, and within which flammable vapors or combustible powders are not likely to be released, shall be unclassified.

(F) Unclassified Locations. Locations using drying, curing, or fusion apparatus and provided with positive

mechanical ventilation adequate to prevent accumulation of flammable concentrations of vapors, and provided with effective interlocks to de-energize all electrical equipment (other than equipment identified for Class I locations) in case the ventilating equipment is inoperative, shall be permitted to be unclassified where the authority having

jurisdiction so judges.

Informational Note: For further information regarding safeguards, see NFPA 86-2011, Standard for Ovens and Furnaces.

516.4 Wiring and Equipment in Class I Locations.

(A) Wiring and Equipment — Vapors. All electrical wiring and equipment within the Class I location (containing vapor only — not residues) defined in 516.3 shall comply with the applicable provisions of Article 501 or Article 505, as applicable.

(B) Wiring and Equipment — Vapors and Residues. Unless specifically listed for locations containing deposits of dangerous quantities of flammable or combustible vapors, mists, residues, dusts, or deposits (as applicable), there shall be no electrical equipment in any spray area as herein defined whereon deposits of combustible residue may

readily accumulate. All electrical wiring shall be per 516.4(A)., except wiring in rigid metal conduit, intermediate

metal conduit, Type MI cable, or in metal boxes or fittings containing no taps, splices, or terminal connections. [33:6.4.2]

(C) Illumination.

(1) Luminaires, like that shown in Figure 516.4(C)(1), that are attached to the walls or ceiling of a spray area but Page 55 of 62

that are outside any classified area and are separated from the spray area by glass panels shall be suitable for use in

unclassified locations. Such fixtures shall be serviced from outside the spray area. [33:6.6.1]

Figure 516.4(C)(1) Example of a Luminaire that is Mounted Outside of the Spray Area and is Serviced from Outside the Spray Area. [33:Figure 6.6.1]

(2) Luminaires, like that shown in Figure 516.4(C)(1), that are attached to the walls or ceiling of a spray area; that are separated from the spray area by glass panels and that are located within a Class I, Division 2; a Class I, Zone

2; a Class II, Division 2; or a Zone 22 location shall be suitable for such location. Such fixtures shall be serviced from outside the spray area. [33:6.6.2]

(3) Luminaires, like that shown in Figure 516.4(C)(3), that are an integral part of the walls or ceiling of a spray area

shall be permitted to be separated from the spray area by glass panels that are an integral part of the fixture. Such

fixtures shall be listed for use in Class I, Division 2; Class I, Zone 2; Class II, Division 2; or Zone 22 locations, whichever is applicable, and also shall be listed for accumulations of deposits of combustible residues. Such fixtures shall be permitted to be serviced from inside the spray area. [33:6.6.3]

Figure 516.4(C)(3) Example of a Luminaire that is an Integral Part of the Spray Area and is Serviced from Inside the Spray Area. [33:Figure 6.6.3]

(4) Glass panels used to separate luminaires from the spray area or that are an integral part of the luminaire shall meet the following requirements.

Page 56 of 62

(a) Panels for light fixtures or for observation shall be of heat-treated glass, laminated glass, wired glass, or

hammered-wired glass and shall be sealed to confine vapors, mists, residues, dusts, and deposits to the spray area. [33:5.5.1]

Exception: Listed spray booth assemblies that have vision panels constructed of other materials shall be permitted.

(b) Panels for light fixtures shall be separated from the fixture to prevent the surface temperature of the panel from exceeding 93°C (200°F). [33:5.5.2]

(c) The panel frame and method of attachment shall be designed to not fail under fire exposure before the vision panel fails. [33:5.5.3]

(C) Illumination. Illumination of readily ignitible areas through panels of glass or other transparent or translucent material shall be permitted only if it complies with the following:

(1) Fixed lighting units are used as the source of illumination.

(2) The panel effectively isolates the Class I location from the area in which the lighting unit is located.

(3) The lighting unit is identified for its specific location.

(4) The panel is of a material or is protected so that breakage is unlikely.

(5) The arrangement is such that normal accumulations of hazardous residue on the surface of the panel will not be raised to a dangerous temperature by radiation or conduction from the source of illumination.

(D) Portable Equipment. Portable electric luminaires or other utilization equipment shall not be used in a spray area during spray operations.

Exception No. 1: Where portable electric luminaires are required for operations in spaces not readily illuminated by fixed lighting within the spraying area, they shall be of the type identified for Class I, Division 1 or Class 1, Zone 1 locations where readily ignitible residues may be present. [33:6.9 Exception]

Exception No. 2: Where portable electric drying apparatus is used in spray booths and the following requirements are met:

(a) The apparatus and its electrical connections are not located within the spray enclosure during spray operations.

(b) Electrical equipment within 450 mm (18 in.) of the floor is identified for Class I, Division 2 or Class I, Zone 2 locations.

(c) All metallic parts of the drying apparatus are electrically bonded and grounded.

(d) Interlocks are provided to prevent the operation of spray equipment while drying apparatus is within the spray

enclosure, to allow for a 3-minute purge of the enclosure before energizing the drying apparatus and to shut off drying apparatus on failure of ventilation system.

(E) Electrostatic Equipment. Electrostatic spraying or detearing equipment shall be installed and used only as

provided in 516.10.

Informational Note: For further information, see NFPA 33-2011, Standard for Spray Application Using Flammable or Combustible Materials.

(F) Static Electric Discharges.

(1) All persons and all electrically conductive objects, including any metal parts of the process equipment or apparatus, containers of material, exhaust ducts, and piping systems that convey flammable or combustible liquids, shall be electrically grounded. [34:6.8.1]

(2) Provision shall be made to dissipate static electric charges from all nonconductive substrates in printing processes.

516.7 Wiring and Equipment Not Within Classified I and II Locations.

(A) Wiring. All fixed wiring above the Class I and II locations shall be in metal raceways, Type PVC conduit, Type RTRC conduit, or electrical nonmetallic tubing; where cables are used, they shall be Type MI, Type TC, or Type MC cable. Cellular metal floor raceways shall only be permitted to supply ceiling outlets or as extensions to the area

below the floor of a Class I or II location. Where cellular metal raceways, are used, they shall not have connections leading into or passing through the Class I or II location unless suitable seals are provided.

Page 57 of 62

(B) Equipment. Equipment that may produce arcs, sparks, or particles of hot metal, such as lamps and lampholders

for fixed lighting, cutouts, switches, receptacles, motors, or other equipment having make-and-break or sliding contacts, where installed above a Classified I or II location or above a location where freshly finished goods are handled, shall be of the totally enclosed type or be constructed so as to prevent the escape of sparks or hot metal

particles.

516.10 Special Equipment.

(A) Fixed Electrostatic Equipment. This section shall apply to any equipment using electrostatically charged

elements for the atomization, charging, and/or precipitation of hazardous materials for coatings on articles or for

other similar purposes in which the charging or atomizing device is attached to a mechanical support or manipulator. This shall include robotic devices. This section shall not apply to devices that are held or manipulated by hand. Where robot or programming procedures involve manual manipulation of the robot arm while spraying with the high

voltage on, the provisions of 516.10(B) shall apply. The installation of electrostatic spraying equipment shall comply with 516.10(A)(1) through (A)(10). Spray equipment shall be listed except as permitted by 11.5 of NFPA 33. All automatic electrostatic equipment systems shall comply with 516.4(A)(1) through (A)(9).

(1) Power and Control Equipment. Transformers, high-voltage supplies, control apparatus, and all other electrical portions of the equipment shall be installed outside of the Class I location as defined in 516.3 or be of a type identified for the location.

Exception: High-voltage grids, electrodes, electrostatic atomizing heads, and their connections shall be permitted

within the Class I location.

(2) Electrostatic Equipment. Electrodes and electrostatic atomizing heads shall be adequately supported in permanent locations and shall be effectively insulated from ground. Electrodes and electrostatic atomizing heads that

are permanently attached to their bases, supports, reciprocators, or robots shall be deemed to comply with this section.

(3) High-Voltage Leads. High-voltage leads shall be properly insulated and protected from mechanical damage or

exposure to destructive chemicals. Any exposed element at high voltage shall be effectively and permanently supported on suitable insulators and shall be effectively guarded against accidental contact or grounding.

(4) Support of Goods. Goods being coated using this process shall be supported on conveyors or hangers. The conveyors or hangers shall be arranged (1) to ensure that the parts being coated are electrically connected to

ground with a resistance of 1 megohm or less and (2) to prevent parts from swinging.

(5) Automatic Controls. Electrostatic apparatus shall be equipped with automatic means that will rapidly de-energize the high-voltage elements under any of the following conditions:

(1) Stoppage of ventilating fans or failure of ventilating equipment from any cause

(2) Stoppage of the conveyor carrying goods through the high-voltage field unless stoppage is required by the spray process

(3) Occurrence of excessive current leakage at any point in the high-voltage system

(4) De-energizing the primary voltage input to the power supply

(6) Grounding. All electrically conductive objects in the spray area, except those objects required by the process to be at high voltage, shall be adequately grounded. This requirement shall apply to paint containers, wash cans,

guards, hose connectors, brackets, and any other electrically conductive objects or devices in the area.

Informational Note: For more information on grounding and bonding for static electricity purposes, see NFPA 33-2011, Standard for Spray Application Using Flammable or Combustible Materials; NFPA 34-2011, Standard for

Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids; and NFPA 77-2007, Recommended Practice on Static Electricity.

(7) Isolation. Safeguards such as adequate booths, fencing, railings, interlocks, or other means shall be placed

about the equipment or incorporated therein so that they, either by their location, character, or both, ensure that a safe separation of the process is maintained.

(8) Signs. Signs shall be conspicuously posted to convey the following:

(1) Designate the process zone as dangerous with regard to fire and accident

(2) Identify the grounding requirements for all electrically conductive objects in the spray area

Page 58 of 62

(3) Restrict access to qualified personnel only

(9) Insulators. All insulators shall be kept clean and dry.

(10) Other Than Nonincendive Equipment. Spray equipment that cannot be classified as nonincendive shall comply with (A)(10)(a) and (A)(10)(b).

(a) Conveyors, or hangers, and application equipment shall be arranged so as to maintain a safe that a minimum separation distance of at least twice the sparking distance is maintained between the workpiece or material being

sprayed between goods being painted and electrodes, electrostatic atomizing heads, or charged conductors. Warnings defining this safe distance shall be posted. [33:11.4.1]

(b) The equipment shall provide an automatic means of rapidly de-energizing the high-voltage elements in the event the distance between the goods being painted and the electrodes or electrostatic atomizing heads falls below that specified in (a). [33:11.3.8]

(B) Electrostatic Hand-Spraying Equipment. This section shall apply to any equipment using electrostatically charged elements for the atomization, charging, and/or precipitation of flammable and combustible materials for coatings on articles, or for other similar purposes in which the charging or atomizing device is hand-held and or

manipulated during the spraying operation. Electrostatic hand-spraying equipment and devices used in connection with paint-spraying operations shall be of listed types and shall comply with 516.10(B)(1) through (B)(5).

(1) General. The high-voltage circuits shall be designed so as not to produce a spark of sufficient intensity to ignite the most readily ignitible of those vapor–air mixtures likely to be encountered, or result in appreciable shock hazard

upon coming in contact with a grounded object under all normal operating conditions. The electrostatically charged exposed elements of the handgun shall be capable of being energized only by an actuator that also controls the coating material supply.

(2) Power Equipment. Transformers, power packs, control apparatus, and all other electrical portions of the equipment shall be located outside of the Class I location or be identified for the location.

Exception: The handgun itself and its connections to the power supply shall be permitted within the Class I location.

(3) Handle. The handle of the spraying gun shall be electrically connected to ground by a conductive material metallic connection and be constructed so that the operator in normal operating position is in direct intimate

electrical contact with the grounded handle with a resistance of not more than 1 megohm to prevent buildup of a static charge on the operator’s body. Signs indicating the necessity for grounding other persons entering the spray

area shall be conspicuously posted.

(4) Electrostatic Equipment. All electrically conductive objects in the spraying area, except those objects required by the process to be at high voltage shall be electrically connected to ground with a resistance of not more than 1

megohm adequately grounded. This requirement shall apply to paint containers, wash cans, and any other electrical conductive objects or devices in the area. The equipment shall carry a prominent, permanently installed warning regarding the necessity for this grounding feature.

Informational Note: For more information on grounding and bonding for static electricity purposes, see NFPA 33-2011, Standard for Spray Application Using Flammable or Combustible Materials; NFPA 34-2011, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids; and NFPA 77-2007, Recommended Practice on Static Electricity.

(5) Support of Objects. Objects being painted shall be maintained in electrical metallic contact with the conveyor or other grounded support. Hooks shall be regularly cleaned to ensure adequate grounding of 1 megohm or less. Areas of contact shall be sharp points or knife edges where possible. Points of support of the object shall be

concealed from random spray where feasible; and, where the objects being sprayed are supported from a conveyor, the point of attachment to the conveyor shall be located so as to not collect spray material during normal operation. [33: Chapter 12]

(C) Powder Coating. This section shall apply to processes in which combustible dry powders are applied. The hazards associated with combustible dusts are present in such a process to a degree, depending on the chemical composition of the material, particle size, shape, and distribution.

(1) Electrical Equipment and Sources of Ignition. Electrical equipment and other sources of ignition shall

comply with the requirements of Article 502. Portable electric luminaires and other utilization equipment shall not be used within a Class II location during operation of the finishing processes. Where such luminaires or utilization equipment are used during cleaning or repairing operations, they shall be of a type identified for Class II, Division 1

locations, and all exposed metal parts shall be connected to an equipment grounding conductor.

Exception: Where portable electric luminaires are required for operations in spaces not readily illuminated by fixed Page 59 of 62

lighting within the spraying area, they shall be of the type listed for Class II, Division 1 locations where readily

ignitible residues may be present.

(2) Fixed Electrostatic Spraying Equipment. The provisions of 516.10(A) and 516.10(C)(1) shall apply to fixed electrostatic spraying equipment.

(3) Electrostatic Hand-Spraying Equipment. The provisions of 516.10(B) and 516.10(C)(1) shall apply to electrostatic hand-spraying equipment.

(4) Electrostatic Fluidized Beds. Electrostatic fluidized beds and associated equipment shall be of identified types.

The high-voltage circuits shall be designed such that any discharge produced when the charging electrodes of the

bed are approached or contacted by a grounded object shall not be of sufficient intensity to ignite any powder–air mixture likely to be encountered or to result in an appreciable shock hazard.

(a) Transformers, power packs, control apparatus, and all other electrical portions of the equipment shall be located

outside the powder-coating area or shall otherwise comply with the requirements of 516.10(C)(1).

Exception: The charging electrodes and their connections to the power supply shall be permitted within the powder-coating area.

(b) All electrically conductive objects within the powder-coating area shall be adequately grounded. The powder-coating equipment shall carry a prominent, permanently installed warning regarding the necessity for grounding these objects.

Informational Note: For more information on grounding and bonding for static electricity purposes, see NFPA 33-

2011, Standard for Spray Application Using Flammable or Combustible Materials; NFPA 34-2011, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids; and NFPA 77-2007, Recommended Practice on Static Electricity.

(c) Objects being coated shall be maintained in electrical contact (less than 1 megohm) with the conveyor or other support in order to ensure proper grounding. Hangers shall be regularly cleaned to ensure effective electrical contact. Areas of electrical contact shall be sharp points or knife edges where possible.

(d) The electrical equipment and compressed air supplies shall be interlocked with a ventilation system so that the equipment cannot be operated unless the ventilating fans are in operation. [33: Chapter 15]

516.16 Grounding. All metal raceways, the metal armors or metallic sheath on cables, and all non–current-carrying metal parts of fixed or portable electrical equipment, regardless of voltage, shall be grounded and bonded.

Grounding and bonding shall comply with 501.30, 502.30, or 505.25, as applicable.

5. Statement of Problem and Substantiation for Comment: (Note: State the problem that would be resolved by your recommendation; give the specific

reason for your Comment, including copies of tests, research papers, fire experience, etc. If more than 200 words, it may be abstracted for publication.)

For the 2011 NEC, the Informational Notes in Article 516 were revised to the 2011 editions of NFPA 33 and NFPA 34. The actual text in Article 516, however, remained the extracted text from 2007.

Proposal 14-244 and others proposed partial revisions to 516, but no proposal addressed all of the parts of 516 that were 2007 extracted text.

The TCC directed that a task group be formed consisting of members of CMP14 and the Committee on Finishing Processes.

This comment was prepared by a Task Group consisting of the following members: CMP14 Don Ankele, UL, Task Group Chair Bill Lawrence, FM Global Jeremy Neagle, US Bureau of ATF Ed Briesch, UL LLC Fred Walker , US Department of the Air Force

Page 60 of 62




Normally, locations outside of buildings or localized operations within a larger room or space. Suchlocations are normally provided with some local vapor extraction/ventilation system. In automated operations, the arealimits shall be the maximum area in the direct path of spray operations. In manual operations, the area limits shall be themaximum area of spray when aimed at 180 degrees to the application surface.

In automated operations, the spray area limits shall be the maximum area in the direct path of spray operations.In manual operations, the spray area limits shall be the maximum area of spray when aimed at 180 degrees to

the application surface.

I accept the concept that NEC definitions are not required to be in single sentences. However, onrereading it appears that a subject is needed for the second sentence. I also feel that CMP 14 might want to considerwhether to place the third and fourth sentences, which are requirements, in an alternate location within Article 516, sincedefinitions are not allowed to contain requirements. The NEC Manual of Style states as follows:

Definitions. Definitions shall be in alphabetical order and shall not contain the term that is being defined.Definitions shall not contain requirements or recommendations.Another approach would be to simply make the third and last sentences into an informational note, for example asfollows:

In automated operations, the spray area limits should be the maximum area in the direct path ofspray operations. In manual operations, the spray area limits should be the maximum area of spray when aimed at 180degrees to the application surface.Similar approaches to what is being suggested above for spray areas might be done also for spray booths and sprayrooms but spray area is the term with the clearest problems because of the requirements and the missing subject.

_______________________________________________________________________________________________14-69 Log #493 NEC-P14



Normally, locations outside of buildings or localized operations within a larger room or space. Suchlocations are normally provided with some local vapor extraction/ventilation system. In automated operations, the arealimits shall be the maximum area in the direct path of spray operations. In manual operations, the area limits shall be themaximum area of spray when aimed at 180 degrees to the application surface.

I accept the concept that NEC definitions are not required to be in single sentences. However, onrereading it appears that a subject is needed for the second sentence. I also feel that CMP 14 might want to considerwhether to place the third and fourth sentences, which are requirements, in an alternate location within Article 516, sincedefinitions are not allowed to contain requirements. This is proposed in an additional comment. The NEC Manual ofStyle states as follows:

Definitions. Definitions shall be in alphabetical order and shall not contain the term that is being defined.Definitions shall not contain requirements or recommendations.Another approach would be to simply make the third and last sentences into an informational note, for example asfollows:

In automated operations, the spray area limits should be the maximum area in the direct path ofspray operations. In manual operations, the spray area limits should be the maximum area of spray when aimed at 180degrees to the application surface.Similar approaches to what is being suggested above for spray areas might be done also for spray booths and sprayrooms but spray area is the term with the clearest problems because of the requirements and the missing subject.

41Printed on 10/31/2012

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with the action on taken on Proposal 1-114.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


_______________________________________________________________________________________________14-71 Log #240 NEC-P14


19-108The Correlating Committee directs that this proposal be reported as "Accept" to correlate with the

action on Proposal 14-238.The Correlating Committee notes that motor fuel dispensing stations are under the purview of Code-Making Panel 14.The Correlating Committee understands that the text deleted in this proposal is relocated into 514.3(C) as indicated in

the action on Proposal 14-238.This is a direction from the National Electrical Code Technical Correlating Committee in accordance


42Printed on 10/31/2012

Page 62 of 62

Documents

National Fire Protection Association - NFPA · Report on Comments – June 2013 NFPA 70 Revise the parent text for 516.2 to make it consistent with the new parent text of 504.2. A