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ELECTRICAL CONTINUING EDUCATION
CAROSELLA ELECTRICAL SEMINARS
56 Cobble Stone Rd. Longmeadow, Ma. 01106
(413) 567-9101
Connecticut
2020 RENEWAL YEAR CONFERENCE WORKBOOK
Licenses E1, E2, E5, E9
2017 NEC Chapters 4-5 CT Building Codes
Applicable Amendments
Continuing Education for Connecticut Electricians for the Renewal of License
Public Act 02-142, pursuant to Section 20-334d of the Connecticut General Statutes, requires that all types of Electrical license holders have to obtain four (4)hours of continuing education of instruction
to renew their respective license in the year 2019.
The reader is expressly warned to consider and adopt all safety precautions that might be Indicated by the activities herein to avoid all potential hazards. By following the instructions contained herein, the reader willingly assumes all risks in connection with such instructions. The provider or instructor
makes no representation or warranties of any kind, including but not limited to, the warranties of fitness for particularly purpose of mechantability nor are any such representations implied with respect to the material set forth herein, and the provider or instructor takes no responsibility with respect to such material. The provider or instructor shall not be
liable for any special, consequential, or exemplary damages resulting in whole or part, from the readers' use of, or reliance upon, this material.
2020 CT
Connecticut General Statues and Regulations
Sec. 20-340. Exemptions from licensing requirements. The provisions of this chapter shall not apply to:
(1) Persons employed by any federal, state or municipal agency; (2) employees of any public service
company regulated by the Public Utilities Regulatory Authority or of any corporate affiliate of any such
company when the work performed by such affiliate is on behalf of a public service company, but in
either case only if the work performed is in connection with the rendition of public utility service,
including the installation or maintenance of wire for community antenna television service, or is in
connection with the installation or maintenance of wire or telephone sets for single-line telephone
service located inside the premises of a consumer; (3) employees of any municipal corporation specially
chartered by this state; (4) employees of any contractor while such contractor is performing electrical-
line or emergency work for any public service company; (5) persons engaged in the installation,
maintenance, repair and service of electrical or other appliances of a size customarily used for domestic
use where such installation commences at an outlet receptacle or connection previously installed by
persons licensed to do the same and maintenance, repair and service is confined to the appliance itself
and its internal operation; (6) employees of industrial firms whose main duties concern the maintenance
of the electrical work, plumbing and piping work, solar thermal work, heating, piping, cooling work,
sheet metal work, elevator installation, repair and maintenance work, automotive glass work or flat
glass work of such firm on its own premises or on premises leased by it for its own use; (7) employees of
industrial firms when such employees' main duties concern the fabrication of glass products or
electrical, plumbing and piping, fire protection sprinkler systems, solar, heating, piping, cooling,
chemical piping, sheet metal or elevator installation, repair and maintenance equipment used in the
production of goods sold by industrial firms, except for products, electrical, plumbing and piping systems
and repair and maintenance equipment used directly in the production of a product for human
consumption; (8) persons performing work necessary to the manufacture or repair of any apparatus,
appliances, fixtures, equipment or devices produced by it for sale or lease; (9) employees of stage and
theatrical companies performing the operation, installation and maintenance of electrical equipment if
such installation commences at an outlet receptacle or connection previously installed by persons
licensed to make such installation; (10) employees of carnivals, circuses or similar transient amusement
shows who install electrical work, provided such installation shall be subject to the approval of the State
Fire Marshal prior to use as otherwise provided by law and shall comply with applicable municipal
ordinances and regulations; (11) persons engaged in the installation, maintenance, repair and service of
glass or electrical, plumbing, fire protection sprinkler systems, solar, heating, piping, cooling and sheet
metal equipment in and about single-family residences owned and occupied or to be occupied by such
persons; provided any such installation, maintenance and repair shall be subject to inspection and
approval by the building official of the municipality in which such residence is located and shall conform
to the requirements of the State Building Code; (12) persons who install, maintain or repair glass in a
motor vehicle owned or leased by such persons; (13) persons or entities holding themselves out to be
retail sellers of glass products, but not such persons or entities that also engage in automotive glass
work or flat glass work; (14) persons who install preglazed or preassembled windows or doors in
residential or commercial buildings; (15) persons registered under chapter 400 who install safety-backed
mirror products or repair or replace flat glass in sizes not greater than thirty square feet in residential
buildings; (16) sheet metal work performed in residential buildings consisting of six units or less by new
home construction contractors registered pursuant to chapter 399a, by home improvement contractors
registered pursuant to chapter 400 or by persons licensed pursuant to this chapter, when such work is
limited to exhaust systems installed for hoods and fans in kitchens and baths, clothes dryer exhaust
systems, radon vent systems, fireplaces, fireplace flues, masonry chimneys or prefabricated metal
chimneys rated by Underwriters Laboratories or installation of stand-alone appliances including wood,
pellet or other stand-alone stoves that are installed in residential buildings by such contractors or
persons; (17) employees of or any contractor employed by and under the direction of a properly
licensed solar contractor, performing work limited to the hoisting, placement and anchoring of solar
collectors, photovoltaic panels, towers or turbines; (18) persons performing swimming pool
maintenance and repair work authorized pursuant to section 20-417aa; and (19) any employee of the
Connecticut Airport Authority covered by a state collective bargaining agreement.
Sec. 20-332-15a. Employment of apprentices
(a) Nothing in Chapter 393 of the General Statutes shall be construed to prohibit the
employment of apprentices.
(b) An apprentice may perform the work for which he is being trained only in the
presence and under the direct supervision of a licensed contractor or journeyman in his
trade, and shall comply with all the regulations pertaining thereto.
(c) No apprentice shall at any time engage in any of the work for which a license is
required without direct supervision. Direct supervision shall mean under the guidance of a
licensed contractor or journeyman and within the sight and/or hearing of said licensed
person.
(d) Any person who encourages or permits an apprentice or helper to so engage in the
work or occupation for which a license is required without direct supervision shall also be
subject to appropriate disciplinary action. The contractor who obtains the permit for the
work for which a license is required shall be deemed to have encouraged or permitted the
apprentice or helper to work without direct supervision for the purpose of disciplinary action
by the appropriate board.
(e) Ratios
Nothing in Chapter 393 of the General Statutes shall be construed to prohibit the
employment of apprentices by a licensed contractor in the electrical, plumbing, heating,
piping and cooling, sprinkler fitter or sheet metal work trades according to the following
schedule:
- 20 -
Regulations of Connecticut State Agencies
TITLE 20. Professional & Occupational Licensing, Certification
Revised: 2018-1-3
Department of Consumer Protection
R.C.S.A. §§ 20-332-1—20-332-21a
§20-332-16
TRADE
Electrical, Plumbing, Heating, Piping and Cooling, Sprinkler Fitter and Sheet Metal Work
Ratio continues at 3 Journeypersons to 1 Apprentice.
(f) How to register as an apprentice.
(1) No apprentice shall perform the work of any occupation covered by Chapter 393 of
the General Statutes unless he has first obtained a card of registration from the Connecticut
Department of Labor.
(2) Prior to employing an apprentice, the contractor shall communicate immediately with
the Connecticut Department of Labor to request registration of said apprentice.
(3) When registration is requested for an area of the trade which is not available through
the Connecticut Department of Labor, said contractor shall make his request to the
appropriate board prior to the employment of the apprentice.
(Effective November 20, 1992; Amended June 10, 2011; Amended December 8, 2017)
Sec. 20-332-16. Prohibited acts. Records. Lettering on commercial vehicles
(a) Any licensee who installs, performs or directs the performance of work in violation
of any applicable state statute, state code, or state regulation, any municipal code or
ordinance, any of these regulations, or who violates generally accepted basic trade practices
shall be subject to disciplinary action by the appropriate board.
(b) Licensed contractors alone shall be permitted to acquire building permits to perform
work covered by chapter 393 of the General Statutes and the regulations promulgated
thereunder. In order to apply for a building permit to perform work covered by chapter 393
of the General Statutes and the regulations adopted thereunder a contractor shall be directly
employed by the business on a regular and full time basis. In applying for the building
permit to perform work covered by chapter 393 of the General Statutes and the regulations
promulgated thereunder the contractor is attesting to the fact that he is responsible for and
will directly supervise the work being performed under said permit. Except as provided for
in Section 20-338b of the General Statutes, the licensed contractor must sign each building
permit application personally and may not delegate the signing of the permit to any
employee, subcontractor or other agent. Any licensed contractor who violates these
regulations shall be subject to disciplinary action by the appropriate board.
(c) No licensee shall engage in or offer to engage in business under any name other than
that stated on his application for a license unless he has notified the board ten days prior to
using the new name.
(d) Any holder of a journeyman’s license who performs work without being in the direct
and regular employ of a properly licensed contractor shall be subject to disciplinary action
by the appropriate board.
(e) All licensed contractors shall keep a record of all employees they employ and exhibit
such records to the Commissioner or her agents upon request.
(f) No one shall perform any work beyond the limitations stated on his license regardless
of the type of license his employer holds. Further, no one holding a limited or unlimited
journeyman’s license can perform any work beyond the limitations of the license held by
the contractor for whom he is employed.
(g) The lettering of the state license numbers required to be displayed on all commercial
vehicles used in the contractor’s business shall be at least one inch high and legible.
(h) Any holder of a contractor’s license who installs, performs or directs the performance
of work for which a building permit is required shall cause said performance of work to be
performed by a person licensed or registered under the provisions of Section 20-334 of the
General Statutes. The contractor who obtains the building permit shall be deemed to have
caused or directed the performance of all work performed under the building permit.
(i) No person shall use solder containing mre than 0.2 per cent lead in making joints and
fitting in any public or private plumbing, heating or cooling system, or fire protection system
as defined in Sections 20-330 (3), 20-330- (5) and 20-330 (9) of the general statutes
Sec. 20-335. License fee. Continuing professional education requirements. Expiration and renewal. Any
person who has successfully completed an examination for such person's initial license under this
chapter shall pay to the Department of Consumer Protection a fee of one hundred fifty dollars for a
contractor's license or a fee of one hundred twenty dollars for any other such license. Any such initial
license fee shall be waived for persons who present a recommendation for review issued pursuant to
section 31-22u. All such licenses shall expire annually. No person shall carry on or engage in the work or
occupations subject to this chapter after the expiration of such person's license until such person has
filed an application bearing the date of such person's registration card with the appropriate board. Such
application shall be in writing, addressed to the secretary of the board from which such renewal is
sought and signed by the person applying for such renewal. A licensee applying for renewal shall, at such
times as the commissioner shall by regulation prescribe, furnish evidence satisfactory to the board that
the licensee has completed any continuing professional education required under sections 20-330 to 20-
341, inclusive, or any regulations adopted thereunder. The board may renew such license if the
application for such renewal is received by the board no later than one month after the date of
expiration of such license, upon payment to the department of a renewal fee of one hundred fifty
dollars in the case of a contractor and of one hundred twenty dollars for any other such license. For any
completed renewal application submitted pursuant to this section that requires a hearing or other
action by the applicable examining board, such hearing or other action by the applicable examining
board shall occur not later than thirty days after the date of submission for such completed renewal
application. The department shall issue a receipt stating the fact of such payment, which receipt shall be
a license to engage in such work or occupation. A licensee who has failed to renew such licensee's
license for a period of over two years from the date of expiration of such license shall have it reinstated
only upon complying with the requirements of section 20-333. All license fees and renewal fees paid to
the department pursuant to this section shall be deposited in the General Fund.
Sec. 20-338a. Work required to be performed by licensed persons. Any contractor who applies for a
building permit from a local building official for any work required to be performed by a person licensed
under the provisions of this chapter, shall cause such work to be performed by a person licensed under
the provisions of this chapter.
Sec. 20-338b. Building permit applications. Who may sign. Any licensed contractor who seeks to obtain a
permit from a building official may sign the building permit application personally or delegate the
signing of the building permit application to an employee, subcontractor or other agent of the licensed
contractor, provided, the licensed contractor's employee, subcontractor or other agent submits to the
building official a dated letter on the licensed contractor's letterhead, signed by the licensed contractor,
stating that the bearer of the letter is authorized to sign the building permit application as the agent of
the licensed contractor. The letter shall not be a copy or a facsimile, but shall be an original letter
bearing the original signature of the licensed contractor. The letter shall also include: (1) The name of
the municipality where the work is to be performed; (2) the job name or a description of the job; (3) the
starting date of the job; (4) the name of the licensed contractor; (5) the name of the licensed
contractor's agent; and (6) the license numbers of all contractors to be involved in the work.
Sec. 20-338c. Work not to commence until permit obtained. No person licensed pursuant to sections 20-
330 to 20-341, inclusive, shall commence work within the scope of sections 20-330 to 20-341, inclusive,
unless each applicable permit with respect to the specific work being performed by such licensee has
been obtained as required pursuant to local ordinances and the general statutes.
Sec. 20-340. Exemptions from licensing requirements. The provisions of this chapter shall not apply to:
(1) Persons employed by any federal, state or municipal agency; (2) employees of any public service
company regulated by the Public Utilities Regulatory Authority or of any corporate affiliate of any such
company when the work performed by such affiliate is on behalf of a public service company, but in
either case only if the work performed is in connection with the rendition of public utility service,
including the installation or maintenance of wire for community antenna television service, or is in
connection with the installation or maintenance of wire or telephone sets for single-line telephone
service located inside the premises of a consumer; (3) employees of any municipal corporation specially
chartered by this state; (4) employees of any contractor while such contractor is performing electrical-
line or emergency work for any public service company; (5) persons engaged in the installation,
maintenance, repair and service of electrical or other appliances of a size customarily used for domestic
use where such installation commences at an outlet receptacle or connection previously installed by
persons licensed to do the same and maintenance, repair and service is confined to the appliance itself
and its internal operation; (6) employees of industrial firms whose main duties concern the maintenance
of the electrical work, plumbing and piping work, solar thermal work, heating, piping, cooling work,
sheet metal work, elevator installation, repair and maintenance work, automotive glass work or flat
glass work of such firm on its own premises or on premises leased by it for its own use; (7) employees of
industrial firms when such employees' main duties concern the fabrication of glass products or
electrical, plumbing and piping, fire protection sprinkler systems, solar, heating, piping, cooling,
chemical piping, sheet metal or elevator installation, repair and maintenance equipment used in the
production of goods sold by industrial firms, except for products, electrical, plumbing and piping systems
and repair and maintenance equipment used directly in the production of a product for human
consumption; (8) persons performing work necessary to the manufacture or repair of any apparatus,
appliances, fixtures, equipment or devices produced by it for sale or lease; (9) employees of stage and
theatrical companies performing the operation, installation and maintenance of electrical equipment if
such installation commences at an outlet receptacle or connection previously installed by persons
licensed to make such installation; (10) employees of carnivals, circuses or similar transient amusement
shows who install electrical work, provided such installation shall be subject to the approval of the State
Fire Marshal prior to use as otherwise provided by law and shall comply with applicable municipal
ordinances and regulations; (11) persons engaged in the installation, maintenance, repair and service of
glass or electrical, plumbing, fire protection sprinkler systems, solar, heating, piping, cooling and sheet
metal equipment in and about single-family residences owned and occupied or to be occupied by such
persons; provided any such installation, maintenance and repair shall be subject to inspection and
approval by the building official of the municipality in which such residence is located and shall conform
to the requirements of the State Building Code; (12) persons who install, maintain or repair glass in a
motor vehicle owned or leased by such persons; (13) persons or entities holding themselves out to be
retail sellers of glass products, but not such persons or entities that also engage in automotive glass
work or flat glass work; (14) persons who install preglazed or preassembled windows or doors in
residential or commercial buildings; (15) persons registered under chapter 400 who install safety-backed
mirror products or repair or replace flat glass in sizes not greater than thirty square feet in residential
buildings; (16) sheet metal work performed in residential buildings consisting of six units or less by new
home construction contractors registered pursuant to chapter 399a, by home improvement contractors
registered pursuant to chapter 400 or by persons licensed pursuant to this chapter, when such work is
limited to exhaust systems installed for hoods and fans in kitchens and baths, clothes dryer exhaust
systems, radon vent systems, fireplaces, fireplace flues, masonry chimneys or prefabricated metal
chimneys rated by Underwriters Laboratories or installation of stand-alone appliances including wood,
pellet or other stand-alone stoves that are installed in residential buildings by such contractors or
persons; (17) employees of or any contractor employed by and under the direction of a properly
licensed solar contractor, performing work limited to the hoisting, placement and anchoring of solar
collectors, photovoltaic panels, towers or turbines; (18) persons performing swimming pool
maintenance and repair work authorized pursuant to section 20-417aa; and (19) any employee of the
Connecticut Airport Authority covered by a state collective bargaining agreement.
Sec. 20-341. Penalties for violations. (a) Any person who wilfully engages in or practices the
work or occupation for which a license is required by this chapter or chapter 399b without
having first obtained an apprentice permit or a certificate and license for such work, as
applicable, or who wilfully employs or supplies for employment a person who does not have a
certificate and license for such work, or who wilfully and falsely pretends to qualify to engage in
or practice such work or occupation, including, but not limited to, offering to perform such work
in any print, electronic, television or radio advertising or listing when such person does not hold
a license for such work as required by this chapter, or who wilfully engages in or practices any of
the work or occupations for which a license is required by this chapter after the expiration of
such person's license, shall be guilty of a class B misdemeanor, except that no criminal charges
shall be instituted against such person pursuant to this subsection unless the work activity in
question is reviewed by the Commissioner of Consumer Protection, or the commissioner's
authorized agent, and the commissioner or such agent specifically determines, in writing, that
such work activity requires a license and is not the subject of a bona fide dispute between
persons engaged in any trade or craft, whether licensed or unlicensed. Notwithstanding the
provisions of subsection (d) or (e) of section 53a-29 and subsection (d) of section 54-56e, if the
court determines that such person cannot fully repay any victims of such person within the
period of probation established in subsection (d) or (e) of section 53a-29 or subsection (d) of
section 54-56e, the court may impose probation for a period of not more than five years. The
penalty provided in this subsection shall be in addition to any other penalties and remedies
available under this chapter or chapter 416.
(b) The appropriate examining board or the Commissioner of Consumer Protection may, after
notice and hearing, impose a civil penalty for each violation on any person who (1) engages in or
practices the work or occupation for which a license or apprentice registration certificate is
required by this chapter, chapter 394, chapter 399b or chapter 482 without having first obtained
such a license or certificate, or (2) wilfully employs or supplies for employment a person who
does not have such a license or certificate or who wilfully and falsely pretends to qualify to
engage in or practice such work or occupation, or (3) engages in or practices any of the work or
occupations for which a license or certificate is required by this chapter, chapter 394, chapter
399b or chapter 482 after the expiration of the license or certificate, or (4) violates any of the
provisions of this chapter, chapter 394, chapter 399b or chapter 482 or the regulations adopted
pursuant thereto. Such penalty shall be in an amount not more than one thousand dollars for a
first violation of this subsection, not more than one thousand five hundred dollars for a second
violation of this subsection and not more than three thousand dollars for each violation of this
subsection occurring less than three years after a second or subsequent violation of this
subsection, except that any individual employed as an apprentice but improperly registered shall
not be penalized for a first offense.
(c) If an examining board or the Commissioner of Consumer Protection imposes a civil penalty
under the provisions of subsection (b) of this section as a result of a violation initially reported
by, a municipal building official in accordance with subsection (c) of section 29-261, the
commissioner shall, not less than sixty days after collecting such civil penalty, remit one-half of
the amount collected to such municipality.
(d) A violation of any of the provisions of this chapter shall be deemed an unfair or deceptive
trade practice under subsection (a) of section 42-110b.
(e) This section shall not apply to any person who (1) holds a license issued under this chapter,
chapter 394, chapter 399b or chapter 482 and performs work that is incidentally, directly and
immediately appropriate to the performance of such person's trade where such work commences
at an outlet, receptacle or connection previously installed by a person holding the proper license,
or (2) engages in work that does not require a license under this chapter, chapter 394, chapter
399b or chapter 482.
2017 NEC Chapter 4
Equipment For General Use
404.22 Electronic Lighting Control Switches.
■ 2017 NEC Change
In conjunction with revisions to 404.2(C), new text was added at 404.22 stating that electronic lighting
control switching devices are required to be listed and “shall not introduce current on the equipment
grounding conductor during normal operation.” This prohibition on introducing current on the
equipment grounding conductor has a future effective date of January 1, 2020.
406.2 Definitions. [Receptacles, Cord Connectors, and Attachment Plugs (Caps)]
■ 2017 NEC Change
A clear and expressive definition for the term “outlet box hood” was added at 406.2.
406.3 Receptacle Rating and Type.
■ 2017 NEC Change
The word “Controlled” is now required to be placed on the controlled receptacle along with the previous
symbol. The word “Controlled” was also added to Figure 406.3(E). The controlled receptacle symbol and
the word “Controlled” are to be placed on the controlled receptacle face (not the faceplate or cover)
and visible after installation.
406.3 Receptacle Rating and Type.
■ 2017 NEC Change
New provisions were added pertaining to 125-volt 15- or 20-ampere receptacle that additionally
provides Class 2 power in the form of a USB charger. These new provisions require these devices to be
listed and constructed such that the Class 2 circuitry is integral with the receptacle.
406.4 General Installation Requirements.
■ 2017 NEC Change
The main requirement of AFCI protection at replacement receptacles as described in the 2014 NEC holds
true with two new exceptions added. The first new exception recognizes applications where an existing
two- wire receptacle is replaced and no equipment grounding conductor can be installed. The second
new exception stipulates that the exception to 210.12(B) does not apply when replacing existing
receptacles.
406.4 General Installation Requirements. ■ 2017 NEC Change
406.4(D)(5) still requires listed tamper-resistant receptacles where replacements are made at receptacle outlets
that are required to be tamper-resistant elsewhere in the Code “except where a non-grounding receptacle is
replaced with another non-grounding receptacle.” The tamper-resistant receptacle requirements at 406.12
remained basically the same for dwelling units, guest rooms and guest suites of hotels and motels,
and for a child care facility (see complete change report for 406.12 in this periodical).
406.6 Receptacle Faceplates (Cover Plates).
■ 2017 NEC Change
New requirements were added at 406.6(D) about receptacle faceplates with integral night lights and/or
USB chargers. These faceplates must be listed and constructed such that the night light and/or Class 2
circuitry is “integral with the flush device cover plate.”
406.9 Receptacles in Damp or Wet Locations.
■ 2017 NEC Change
The previous requirements for 15- and 20-ampere, 125- and 250-voltreceptacles installed in a wet
location still holds true with language added to indicate that other listed products, enclosures, or
assemblies providing weatherproof protection that do not utilize an outlet box hood need not be
marked “extra duty.”
406.12 Tamper-Resistant Receptacles.
■ 2017 NEC Change Requirements for tamper-resistant receptacles were expanded to mobile
homes, preschools and elementary education facilities, as well as other locations where small children
are likely to congregate. TR receptacles were expanded to 250-volt receptacles as well as 125-volt
receptacles.
406.15 Dimmer-Controlled Receptacles.
■ 2017 NEC Change
The requirements for dimmer-controlled receptacles at 406.15 have been deleted.
408.3 Support and Arrangement of Busbars and Conductors. (Switchboards, Switchgear, and
Panelboards)
■ 2017 NEC Change
The barrier requirements of 408.3(A)(2) were expanded to all service panelboards as well as service
switchboards and switchgear. An exception also was added eliminating the barriers at panelboards
installed to comply with the requirements of 408.36, Ex. No. 1, 2, and 3.
409.22(B) Short-Circuit Current Rating. (Industrial Control Panels).
■ 2017 NEC Change
The missing companion component for documentation of the available
short-circuit current (fault current) at industrial control panels was added at 409.22(B). This new
requirement also required documentation of the date the short-circuit current calculation was
performed.
410.62 Cord-Connected Lampholders and Luminaires.
■ 2017 NEC Change
The same basic requirements still apply to cord-connected electric discharge and LED luminaires with
the information re-organized into an easier to understand list format that improves the clarity of the
content.
Article 411 Low-Voltage Lighting Systems Operating at 30 Volts or Less and Lighting Equipment
Connected to Class 2 Power Sources.
■ 2017 NEC Change Article 411 was re-organized and renamed.
422.2 Definition. (Appliances)
■ 2017 NEC Change
Vending machines are still required to be GFCI-protected, but the require- ment has been relocated to
422.5(A)(5). All appliances operating at 50 volts or more are now required be listed (see new 422.6). In
determining what constitutes a vending machine, the user of the Code will need to rely on the listing
and the product standards for vending machines.
422.5 Ground-Fault Circuit-Interrupter (GFCI) Protection for Personnel.
■ 2017 NEC Change
The five appliances requiring GFCI protection in Article 422 were grouped together, and the GFCI
requirements for these appliances were relocated to one location at 422.5(A). A new 422.5(B) was also
added allowing five options for the location and type of GFCI protective device provided to
deliver GFCI protection to the specific appliances listed at 422.5(A).
422.6 Listing Required. (Appliances)
All appliances operating at 50 volts or more shall be listed.
422.14 Infrared Lamp Industrial Heating Appliances.
■ 2017 NEC Change
Section 422.14 titled, “Infrared Lamp Industrial Heating Appliances,” was deleted and the information
relocated to new Article 425 at 425.14.
422.16 Flexible Cords. (Appliances)
■ 2017 NEC Change
Dishwashers are now only permitted to have the receptacle outlet for a cord- and plug-connected built-
in dishwasher to be located in the space adjacent to the space occupied by the dishwasher. The
maximum length of a cord for a built-in dishwasher was extended from the previous maxi- mum length
of 1.2 m (4 ft) to 2.0 m (6.5 ft) measured from the face of the attachment plug to the plane of the rear of
the appliance. Other requirements for dishwashers and trash compactors remain the same as in the
2014 NEC.
422.16 Flexible Cords. (Appliances)
■ 2017 NEC Change
The requirements for a cord- and plug-connected range hood are much the same as the 2014 NEC with
the length of the flexible cord expanded to 1.2 m (4 ft). The language pertaining to the receptacle
needing to be located to “avoid” physical damage was changed to “protect against” physical damage to
incorporate more enforceable language.
Article 424 Fixed Electric Space-Heating Equipment
■ 2017 NEC Change
Part V of Article 424 was revised for simpler interpretation and application. Two new sections were
added. These sections (424.45 and 424.47) address proper installations of cables under floor coverings
and labels provided by the manufacturer. The previous edition of the Code did not properly address
these added items in Part V.
424.45 Installation of Cables Under Floor Coverings.
■ 2017 NEC Change
New requirements were added at 424.45 (Part V of Article 424) to give direction for the installation of
heating cables installed under floor coverings.
424.47 Label Provided by Manufacturer.
■ 2017 NEC Change
New requirements for manufacturer’s labels were added at 424.47 in Part V of Article 424 for
application to electric space-heating cables. The manufacturer’s label requirements for heating panels
and panel sets at 424.92(D) remained the same.
Article 424 Fixed Electric Space-Heating Equipment.
■ 2017 NEC Change
To address products identified as low-voltage fixed electric space-heating equipment, a new Part X was
added to Article 424 for the 2017 NEC.
Article 425 Fixed Resistance and Electrode Industrial Process Heating Equipment
■ 2017 NEC Change
New Article 425 (Fixed Resistance and Electrode Industrial Process Heating Equipment) has been
incorporated into the 2017 NEC. In previous editions, the NEC did not adequately address requirements
for industrial process heating equipment. Section 422.14, which covered appliances
with infrared heat lamps, has been relocated to new Article 425 at 425.14.
426.32 Voltage Limitations. (Fixed Outdoor Electric Deicing and Snow-Melting Equipment)
■ 2017 NEC Change
The secondary winding of an isolation transformer connected to an impedance heating element cannot
have an output voltage greater than 30 volts ac. The allowance for voltage output greater than 30 volts
ac if the system is provided with Class A GFCI protection has been deleted.
430.2 Definitions. (Motors, Motor Circuits, and Controllers)
■ 2017 NEC Change
The definition of a part-winding motor was moved from 430.4 to its proper location at 430.2.
430.53 Several Motors or Loads on One Branch Circuit.
■ 2017 NEC Change
New 430.53(D)(4) increases the maximum length of the conductors of any tap supplying a single motor
to 7.5 m (25 ft) when the ampacity is not less than one-third that of the branch-circuit conductors.
430.99 Available Fault Current. (Motors,Motor Circuits, and Controllers)
■ 2017 NEC Change
New provisions were added at 430.99 requiring documentation of the available short-circuit current
(fault current) at motor control centers along with the date the short-circuit current calculation was
performed.
440.9 Grounding and Bonding. (Air-Conditioning and Refrigerating Equipment)
■ 2017 NEC Change
The outdoor portions of metallic raceway systems that use non-threaded fittings are now required to
contain a wire-type equipment grounding conductor when installed outdoors on a roof to supply
multimotor and combination-load equipment.
440.65 Leakage-Current Detector-Interrupt- er (LCDI) and Arc-Fault Circuit Interrupter (AFCI)
Protection Devices.
■ 2017 NEC Change In addition to the previously allowed protection for single-phase, cord-and plug-connected room air conditioners
of LCDI or AFCI protection, a new form of protection was introduced at 440.65 allowing heat detecting circuit
interrupter (HDCI) protection for room air conditioners. These three forms of protection for room air conditioners
were placed in a list format for better clarity to the user of the Code.
445.11 Marking. (Generators)
■ 2017 NEC Change
Nameplate marking requirements for generators have been revised and put into a list format.
445.13 Ampacity of Conductors. (Generators)
■ 2017 NEC Change
A new requirement clarifies that feeder taps can be used if the generator is equipped with an
overcurrent relay or other overcurrent protective device.
445.18 Disconnecting Means Required for Generators and Shutdown of Prime Mover.
■ 2017 NEC Change
Revisions and new requirements were incorporated into 445.18 by installing three subsections for
disconnecting means for a generator. The provisions of 445.18(A) retain the existing requirements, with
revisions, for a disconnecting means for a generator. New 445.18(B) adds requirements for the
shutdown of the prime mover for a generator or generator set.
445.20 Ground-Fault Circuit-Interrupter Protection for Receptacles on 15-kW or Smaller Portable
Generators.
■ 2017 NEC Change
Listed cord sets incorporating GFCI protection for portable generators manufactured or rebuilt prior to
January 1, 2015, are now permitted. GFCI requirements have been separated into unbonded
(floating neutral) generators versus bonded neutral generators.
480.3 Equipment. (Storage Batteries)
Storage batteries and battery management equipment shall be listed. This
requirement shall not apply to lead-acid batteries.
Chapter 5
Special Occupancies
500.2 Definitions Article 100 Definitions
■ 2017 NEC Change
The fourteen definitions that resided at 500.2 in previous editions of the Code have been relocated to
Article 100 of the NEC.
500.5 Classifications of Locations.
■ 2017 NEC Change
The title of 500.5(A) was changed from “Classifications of Locations” to “General” as 500.5(A) applies to
all of 500.5, including 500.5(B), (C), and (D). Revisions to the text of 500.5(A) clarify that “refrigerant
machinery rooms” containing ammonia refrigeration may be classified as “unclassified” locations based
on the use of gas detection and adequate ventilation with this “adequate ventilation” being defined as
“continuous or initiated by a detection system at a concentration not exceeding 150 ppm (parts per
million).”
500.8 Equipment.
■ 2017 NEC Change
Previous Table 500.8(D)(2) has been deleted as the table is no longer applicable because the fixed
ignition temperature limits referenced in the table are no longer used to evaluate Class II temperature
limitations on equipment.
501.10 Wiring Methods. (Class I Locations)
■ 2017 NEC Change
Besides the wiring methods permitted in the previous Code, the wiring methods permitted for Class I,
Division 2 locations have been expanded to include rigid metal conduit (RMC) and intermediate metal
conduit (IMC) with listed threadless fittings, as well as cablebus.
501.15 Sealing and Drainage. (Class I Locations)
■ 2017 NEC Change
A new sentence was added to 501.15(D)(1) identifying that only explosion- proof unions, couplings,
reducers, elbows, and capped elbows that are not larger than the trade size of the enclosure entry are
permitted between the cable sealing fitting and the enclosure in a Class I, Division 1 location.
511.3 Area Classification, General. (Commercial Garages, Repair, and Storage)
■ 2017 NEC Change
The text provisions of 511.3(C) and (D) were revised into a table format and moved to two new tables in
511.3. The previous requirements of 511.3(C) and (D) were replaced with a new Table 511.3(C) covering
both major and minor repair garages where heavier than air gaseous Class I liquids are transferred or
dispensed. New Table 511.3(D) covers major repair garages where vehicles using lighter than air gaseous
fuels are repaired or stored.
511.8 Underground Wiring. (Commercial Ga- rages, Repair and Storage)
■ 2017 NEC Change
A new section (511.8) was added to Article 511 requiring the underground wiring method for a
commercial repair garage to be installed in threaded rigid metal conduit (RMC) or threaded steel
intermediate metal conduit (IMC). A new exception at 511.8 permits PVC conduit, RTRC conduit, and
high-density polyethylene (HDPE) conduit to be used where buried under not less than 600 mm (2 ft) of
cover.
514.3 Classification of Location. (Motor Fuel Dispensing Facilities)
■ 2017 NEC Change
Specific requirements for fuel storage of compressed natural gas, liquefied natural gas, and liquefied
petroleum gas were put in place, along with references to other NFPA documents that offer further
detail were added to the 2017 NEC.
514.8 Underground Wiring. (Motor Fuel Dispensing Facilities)
■ 2017 NEC Change
In addition to the permitted wiring methods allowed in the 2014 NEC, high density polyethylene (HDPE)
conduit was added to 514.8, Ex. No. 2 as an acceptable wiring method for underground installations for
motor fuel dispensing facilities where buried under not less than 600 mm (2 ft) of cover
514.11 Circuit Disconnects. (Motor Fuel Dispensing Facilities)
■ 2017 NEC Change
The same basic requirements for the emergency shutoff devices still exist for the 2017 NEC. Fuel
dispensing systems are required to be provided with one or more clearly identified emergency shutoff
devices or electrical disconnects. Such devices or disconnects shall be installed in approved locations but
not less than 6 m (20 ft) or more than 30 m (100 ft) from the fuel dispensing devices that they serve.
Language was revised at 514.11 to clearly indicate that these minimum and maximum distances hold
true at both attended and unattended motor fuel dispensing facilities.
Article 516 Spray Application, Dipping, Coating, and Printing Processes Using Flammable or
Combustible Materials
■ 2017 NEC Change
Article 516 was re-arranged and revised to give the article a clearer out- line. Four individual parts were
added to the article. The requirements now align with the requirements of NFPA 33 and NFPA 34.
517.2 Definitions. (Health Care Facilities)
■ 2017 NEC Change
The term “governing body” appears at seven different locations in Article 517 for the 2017 NEC and a
new definition has been added at 517.2.
517.2 Definitions. (Health Care Facilities)
■ 2017 NEC Change
The definition of a Health Care Facility was revised for the 2017 NEC and now includes the term “mobile
enclosures.” The examples of a health care facility that were included in the definition in the previous
edition of the Code are now found in an informational note below the revised definition
517.2 Definitions. (Health Care Facilities)
■ 2017 NEC Change
To define a well-used term in Article 517, a new definition for Medical Office (Dental Office) was added
at 517.2 for the 2017 NEC
517.2 Definitions. (Health Care Facilities)
■ 2017 NEC Change
The four types of patient care spaces were revised to include NFPA 99 numbered categories assigned to
each of these types of patient care spaces. Bracketed NFPA 99s were was added after each description
and informational note. Informational notes were relocated after each definition, and these
informational notes contain examples of each of the different categories
517.16 Use of Isolated Ground Receptacles.(Health Care Facilities)
■ 2017 NEC Change
New provisions were added to 517.16 pertaining to the proper installation of isolated ground
receptacles located outside of a patient care vicinity. The prohibition of isolated ground receptacle
inside a patient care vicinity are addressed at 517.16(A) and isolated ground receptacles installed
outside a patient care vicinity are addressed at 517.16(B).
517.35 517.30 Sources of Power. (Health Care Facilities)
■ 2017 NEC Change
The same basic provisions that were located at 517.35 were relocated to 517.30. Fuel cell systems will
now be permitted to serve as the alternate source for all or part of an essential electrical system as any
reference to a battery system has been deleted.
517.33 517.34 Critical Branch. (Essential Electrical System-Health Care Facilities)
■ 2017 NEC Change
Positive language was added at 517.34(B) to specifically permit the control of task illumination on the
critical branch of the essential electrical system.
520.2 Definitions. (Theaters, Audience Areas of Motion Picture and Television Studios, Performance
Areas, and Similar Locations)
■ 2017 NEC Change
A new definition of Adapter was added at 520.2 to address misapplication of this term in Article 520.
520.2 Definitions. (Theaters, Audience Areas of Motion Picture and Television Studios, Performance
Areas, and Similar Locations)
■ 2017 NEC Change
A new definition for “Stage Switchboard, Portable” was added to Article 520 and the phrase
“permanently installed” was added to the existing definition of “Stage Switchboard.”
525.23 Ground-Fault Circuit-Interrupter (GFCI) Protection. (Carnivals, Circuses, Fairs, and Similar
Events)
■ 2017 NEC Change
New requirements were imposed at 525.23(D) requiring GFCI protection
to be listed, labeled, and identified for portable use when said GFCI protection is provided through the
use of GFCI receptacles, and the branch circuits supplying these receptacles utilize a flexible cord.
547.5 Wiring Methods. (Agricultural Buildings)
■ 2017 NEC Change
A revision at 547.5(F) eliminated the permission to use a “covered” equip- ment grounding conductor
for an underground installation at agricultural buildings.
550.2 Definitions. (Mobile Homes, Manufactured Homes, and Mobile Home Parks)
■ 2017 NEC Change
The existing definition for a “manufactured home” was revised for consistency with the definition of a
“manufactured home” found in NFPA 501 (Standard on Manufactured Housing). The last sentence of the
definition was revised to exclude park trailers.
550.13 Receptacle Outlets. (Mobile Homes, Manufactured Homes, and Mobile Home Parks)
■ 2017 NEC Change
GFCI protection for mobile homes was revised to reflect GFCI coverage for all sinks, dishwashers, and
other locations similarly found at 210.8(A).
550.25 Arc-Fault Circuit-Interrupter Protection. (Mobile Homes, Manufactured Homes, and Mobile
Home Parks)
■ 2017 NEC Change
AFCI protection at mobile and manufactured homes was revised by eliminating the specific list of rooms
and areas requiring AFCI protection at mobile and manufactured homes and simply requiring
compliance with 210.12.
551.2 Definitions. (Recreational Vehicles and Recreational Vehicle Parks)
■ 2017 NEC Change
The definition of “Recreational Vehicle Park” was revised to correlate with the same definition in NFPA
1194 (Standard for Recreational Vehicle Parks and Campgrounds).
551.71 Type Receptacles Provided. (Recreational Vehicle Parks)
■ 2017 NEC Change
The section has been broken into six separate first level subdivisions with titles. The number of RV sites
required to be equipped with 50-ampere, 125/250-volt receptacles has increased from 20 percent to 40
percent for all new recreational vehicle sites. GFCI devices used in RV site electrical equipment are not
required to be weather- or tamper-resistant in accordance with 406.9 and 406.12.
551.73 Calculated Load. (Recreational Vehicle Parks)
■ 2017 NEC Change
The minimum calculated load for RV parks sites equipped with 50- ampere, 208Y/120 or 120/240-volt
supply facilities has increased from 9600 volt-amperes to 12,000 volt-amperes per site. The calculated
loads for 20-ampere and 30-ampere supply facilities remained the same
551.75 Grounding. (RV Parks)
■ 2017 NEC Change
A new 551.75(B) was added indicating that power outlets or RV site supply equipment (other than those
used as service equipment) are not required to have a grounding electrode established at RV site
electrical equipment.
Article 555 Marinas, Boatyards, and Commercial and Noncommerical Docking Facilities
■ 2017 NEC Change
The title of Article 555 was changed from “Marinas and Boatyards” to “Marinas, Boatyards, and
Commercial and Noncommercial Docking Facilities.” Revisions to 555.1 make Article 555 relevant to
dwelling unit docking facilities as well as commercial docking facilities
555.3 Ground-Fault Protection. (Marinas, Boat- yards and Commercial and Noncommercial Docking
Facilities)
■ 2017 NEC Change The ground-fault protection required for overcurrent protective devices for marinas, and now boatyards, and
commercial and noncommercial docking facilities as well was reduced to a maximum of 30 mA rather than 100
mA. This GFP protection is required in all supply overcurrent pro- tective devices, not necessarily in the main
OCPD. The allowance of GFCI protection in each individual branch or feeder was deleted as this 30 mA GFP
protection is required in all supply OCPDs. GFCI protection is still required for 15- and 20-ampere, single-phase,
125-volt receptacles by the requirements of 555.19(B)(1).
555.19 Receptacles. (Marinas, Boatyards, and Commercial and Noncommercial Docking Facilities)
■ 2017 NEC Change
The statement, “where portable electrical hand tools, electrical diagnostic equipment, or portable
lighting equipment are to be used” was deleted. GFCI protection for personnel will now be required for
all 125-volt, single-phase, 15- and 20-ampere receptacles installed outdoors, in boathouses, and in build-
ings or structures used for storage, maintenance, or repair regardless of the intended use of these
receptacles.
555.24 Signage. (Marinas, Boatyards and Com- mercial and Noncommercial Docking Facilities)
■ 2017 NEC Change
New requirements were added for permanent safety signs to be installed to give notice of electrical
shock hazard risks to persons using or swimming near a boat dock or marina. The signage must comply
with 110.21(B)(1) and be clearly visible from all approaches to a marina or boatyard facility. The signs
shall state “WARNING — POTENTIAL SHOCK HAZARD— ELECTRICAL CURRENTS MAY BE PRESENT IN THE
WATER.”
590.4 General. (Temporary Installations)
■ 2017 NEC Change
Along with Type NM and Type NMC cables, Type SE cable has been added to the acceptable cable
assembly wiring methods for temporary installations. Type SE cable is now permitted to be installed in a
raceway in a temporary underground installation as well.
590.6 Ground-Fault Protection for Personnel. (Temporary Installations)
■ 2017 NEC Change The phrase “In addition to this required ground-fault circuit-interrupter protection for personnel,” was added in
front of “listed cord sets or devices incorporating listed ground-fault circuit-interrupter protection for personnel
identified for portable use shall be permitted.” This added language was to clarify that these portable GFCI cord
sets or devices are permitted in addition to the GFCI protection required for all 125-volt, single-phase, 15-, 20-, and
30-ampere receptacle outlets that are not a part of the permanent wiring of the building or structure.
2014 NEC
Chapters 4-5
CHAPTER FOUR
EQUIPMENT FOR GENERAL USE
400.4 Types (Flexible Cords and Cables). Revision requires “permission by the authority having
jurisdiction” rather than requiring these flexible cords and cables to be the “subject of special
investigation.” . . .rop 6-86; roc 6-69
400.5(A) Ampacity tables for Flexible cords and Cables. A listed cords or cables may include
a temperature marking, but not all flexible cords are req.to be listed . . rop 6-93a, 6-94
400.7(A)(11) Uses Permitted (Flexible Cords and Cables). The wiring interconnecting the inlet
to the single receptacle outlet must be a Chapter 3 wiring method . .rop 6-101; roc 6-71
404.2(C) Grounded Conductor at Switch Locations. Grounded conductor required at all switch
locations with (7) concessions to this main rule . . . rop 9-87 to 91, 82, 83; roc 9-43 to 46
404.8(C) Multipole Snap Switches. Multipole snap switches rated not less than the system
voltage being allowed to be fed from more than a single circuit has been removed from 404.8(C)
. . . rop 9-97; roc 9-47
406.3(E) Controlled Receptacle Marking. It is important to be able to identify receptacle
outlets that are automatically powered on and off . . . rop 18-15
406.4(D) Replacement Receptacles. AFCI and GFCI-type receptacles installed for replacement
receptacles required to be installed in an accessible location . . . rop 18-18
406.5(E) Receptacles in Countertops and Similar Work Surfaces. Restriction to prohibit
receptacles from being installed in face-up position in all occupancies . . . rop 19-32, 33, 34; roc 18-21, 23
406.5(F) Receptacles in Seating areas and Other Similar Surfaces. New provisions added
which prohibits receptacles from being installed in a “face-up” position in seating areas . . . rop
18-34; roc 18-23
406.9(B)(1) 15- and 20-Ampere Receptacles in a Wet Location. “Extra Duty” covers are now
required for all 15- and 20-amp, 125- and 250V receptacles installed in a wet location . . . rop 18-
35, 36, 37, 38
406.12 Tamper-Resistant Receptacles. Tamper-resistant receptacles at dwelling units has been
expanded to guest rooms and guest suites of hotels and motels and child care facilities . . . rop
18-41a, 44, 46, 48 to 52; roc 18-25
406.15 Dimmer Controlled Receptacles. Dimmer-controlled receptacles now permitted for a
plug/receptacle combination in listed nonstandard configuration types . . . rop 18-53
Article 408 and 408.1 Switchboards, Switchgear, and Panelboards. The new definition
creates an opportunity to utilize a generic term in all locations where the term “switchboard” was
mentioned previously, and where the use of the term “switchgear” is appropriate . . . rop 9-103a,
104a, 104, 105, 106; roc 9-55, 56
408.3(E)(2) DC Bus Arrangement. Crucial for installers and maintenance personnel is labeling
of dc buses . . . rop 9-103a, 9-110; roc 9-55, 9-62
408.4(B) Field Identification – Source of Supply. All non-dwelling unit switchboards,
switchgear, and panelboards supplied by a feeder shall be marked to indicate where the power
originates . . . rop 9-116, 9-103a
408.55 Wire-Bending Space Within an Enclosure Containing a Panelboard. Section was
reorganized into a list format rather than one long paragraph for clarity . . .rop 9-130, 131
409.20 Conductor – Minimum Size and Ampacity (Industrial Control Panels). Induction
heating loads were not previously required to be included as a load for determining the ampacity
of the conductors that serve industrial control panels . . .rop 11-13
410.6 Listing Required (Luminaires). Listing requirements for luminaires and lampholders
have been expanded to “Retrofit Kits” . . . rop 18-59
410.10(F) Luminaires Installed in or Under Roof Decking. Luminaires no longer permitted to
be installed within 38 mm (1½ in.) of the lowest metal deck surface . .rop 18-66
410.130(G)(1) Disconnecting Means. Exception for industrial establishments (with qualified
persons) has been deleted . . . rop 18-78 to 80; roc 18-31, 35
422.5 GFCI Protection (Appliances). Readily accessible locations are required for GFCI
devices providing protection to appliances . . . rop 17-19
422.11(F)(3) Water Heaters and Steam Boilers. Previous language did not include appropriate
regulations for electric immersion water heaters used for heating water or solutions in either . . .
rop 17-21
422.23 Tire Inflation and Automotive Vacuum Machines. GFCI protection now required for
all tire inflation and automotive vacuum machines provided for public use…
422.49 High-Pressure Spray Washers. GFCI protection in the cord or plug of high-pressure
spray washing machines expanded to three-phase equipment rated 208Y/120 volts and 60
amperes or less . . . rop 17-37, 18a; roc 17-13, 14
422.51 GFCI Protection – Vending Machines. GFCI protection has been expanded to hard-
wired vening machines as well as cord-and-plug-connected vending machines . . .
Rop 17-38 to 41; roc 17-3
424.19 Disconnecting Means (fixed Electric Space-Heating Equipment). Fixed electric
space-heating equipment can be supplied by more than one source that can include more than
one feeder or branch circuit . . . rop 17-49; roc 17-17
424.66 Installations (Duct Heaters). New provisions were put in place to require limited forms
of working space about duct heaters for fixed electric space-heating equipment . . . rop 17-75;
roc 17-19
430.22(G) Conductors for Small Motors. Current referred to within 430.22(G) is the current
of the motor and not the conductors . . . rop 11-29a; 11-30
430.52(C)(5) rating or Setting: Power Electronic Devices. “Semiconductor fuses” intended to
protect bypass contactors, isolation contractors and conductors in a solid-state motor control
system permitted in lieu of devices listed in Table 430.52 . . .rop 11-359
430.53(D) Single Motor Taps on One Branch Circuit. Revisions clarify that 3 m (10 ft) and
the 7.5 m (25 ft) tap conductors measurements for a motor are intended to begin from the point
of the tap . . . rop 11-36b
430.233 Guards for Attendants. Any voltage above 50V is considered an electrical shock
hazard according to NFPA 70E (Standard for Electrical Safety in the Workplace), the NEC, and
OSHA . . . rop 11-68
445.11 Marking (Generator). A new manufacturer’s marking provision was added requiring
indication whether or not the generator neutral is bonded to the generator
frame . . . rop 13-10, 13-11; roc 13-2
445.18 Disconnecting Means Required for Generators. Portable generators with a cord and
plug connection have been added as an acceptable disconnecting means for a generator . . . rop
13-16; roc 13-18a, 13-5, 6, 7
445.20 GFCI Protection for Receptacles on 15-kW or Smaller, Portable Generators. All
125V, single-phase, 15-and 20 amp receptacle outlets, on 15 kW or smaller, portable generators
shall have GFCI protection; if the generator does not have a 125/250V locking-type receptacle,
GFCI requirements not required . . . rop 11-19; roc 13-16
450.10 Grounding (Transformers). Grounding and bonding connections permitted to be
connected together using methods in 250.8 and must be bonded to the metal
enclosure . . . rop 9-144
450.11 Marking (Transformers). Installation instructions will be provided with “Bi-
Directional” transformers detailing specific info as to how the transformer should be connected
when primary and secondary are reversed . . . rop 9-145; roc 9-73
Article 480 Storage Batteries. Changes in Article 480 resulted in the article being restructures .
. . rop 13-3, 13-22, 13-24 to 33, 37, 38, 42, 44, 45; roc 13-2 to 29
490.48 Substations (Equipment Over 1000 Volts, Nominal). New provisions for a permanent,
single-line diagram of the switchgear to be provided in a readily visible location in the same
room or enclosed area with switchgear . . . rop 4-86 to 94, 9-179; roc 9-9 to 17
CHAPTER FIVE
SPECIAL OCCUPANCIES
501.40 Multiwire Branch Circuits. 501.40 and exception were deleted entirely as requirements
for simultaneous disconnection of all ungrounded conductors of multiwire branch circuits are
provided at 210.4(B) . . . rop 14-59
Article 504 Intrinsically Safe Systems. Article 504 was revised to align with intrinsically safe
products standards . . . rop 14-112, 116, 47, 120, 123 to 125; roc 14-33, 34, 35
514.3(B) Classified Areas Adjacent to Dispenser Mounted on Aboveground Storage Tank.
New Figure 514.3(B) illustrates classified areas adjacent to dispensers mounted on aboveground
storage tanks . . . rop 14-237
Article 516 Spray Application, Dipping, Coating, and Printing Processes. Revised and
reorganized for the 2014 NEC . . . rop 14-234, 244; roc 14-67
517.2 Definitions (Health Care Facilities). Several definitions in Article 517 were revised,
deleted or added as a result of the re-organization of the make-up of the “Essential Electrical
System” of a hospital . . .rop 15-3, 12, 13, 14, 16, 19, 21, 24; roc 15-5, 6, 8, 10, 11, 12
517.16 Use of Isolated Ground Receptacles. An isolated ground receptacle shall not be
installed within a patient care vicinity . . . rop 15-31; roc 15-22
517.18(A) Patient Bed Location (General Care Areas). Receptacles or the cover plates
themselves are required to have a distinctive color or marking so as to be readily identifiable as
being supplied from the critical branch . . . rop 15-34
517.18(B) Patient Bed Location Receptacles (General Care Areas). The minimum number of
receptacles increased from four to eight for general care area patient bed locations . . . rop 15-35,
36
517.19(B) Patient Bed Location Receptacles (Critical Area Areas). The minimum number of
receptacles increased from six to fourteen in critical care area patient bed locations of health care
facilities . . . rop 15-39
517.19(C) Operating Room Receptacles. New 517.19(C) was added requiring a minimum
number of thirty-six receptacles in an operating room of health care
facilities . . . rop 15-41
517.30(B) Essential Electrical System (Hospital). Essential electrical systems for hospitals
shall be comprised of three separate branches capable of supplying a limited amount of lighting
and power service that is considered essential for life safety and effective hospital operation
during the time the normal electrical service is interrupted for any reason . . . rop 15-51, 52; roc
15-4
517.30(G) Coordination (Essential Electrical Systems). This new requirement is not full
selective coordination but only requires “coordination” for fault events that exceed 0.1 seconds .
. . rop 15-66; roc 15-58 to 65
520.2 Definitions (theaters, Television Studios, Performance Areas, Etc.). The three
definitions added to this article to meet demands of new theatre stage lighting technology are
Stage Equipment, Stage Lighting Hoist, Stage Switchboard . . . rop 15-99
547.2 Definitions: Equipotential Plane (Agriculture Buildings). As was indicated with the
previous wording, the equipotential plane never completely eliminates all of the voltage
granulates or stray voltage . . . rop 19-11a; roc 19-5
547.5(F) Separate Equipment Grounding Conductor (Agricultural Buildings). An insulated or
covered aluminum or copper equipment grounding conductor is now permitted for underground
agricultural building installations . . . rop 19-20; roc 19-8
550.15(H) Under-Chassis Wiring (Exposed to Weather). Rather than the conductors having
to be “suitable” for use in a wet location, the conductors must now be “listed” for use in wet
locations . . . rop 19-37, 38, 39
551.4(C) Labels (Recreational Vehicles). Labels must be made of etched, metal-stamped, or
embossed brass, SS, or plastic laminates . . . rop 19-50; roc 19-23
551.71 Type Receptacles Provided (RV Parks). Every recreational vehicle site equipped with
a 50-amp receptacle is now required to also be equipped with a 30-amp, 125V receptacle . . . rop
19-17
555.15(B) and (C) Type and Sizes of EGCs (Marinas and Boatyards). An insulated
aluminum or copper equipment grounding conductor (EGC) is now permitted at marinas and
boatyards . . . rop 19-106; 19-30
590.4(D)(2) Receptacles in Wet Locations (Temporary Installations). “Extra duty” covers
required for all 15- and 20-amp., 125- and 250V receptacles installed at temporary installations
in a wet location . . . rop 3-102; roc 3-33
590.4(I)Termination(s) at Devices (Temporary Installations). Flexible cords and cables must
be secured to boxes with fittings “listed for connecting flexible cords and cables to boxes” . . .
rop 3-104
590.4(J) Support (Temporary Installations). Cable assemblies and flexible cords and cables
shall be supported in place at intervals that ensure that they will be protected from physical
damage . . . rop 3-105; roc 3-
