TO: Code-Making Panel 11

TO:

FROM:

DATE:

M E M O R A N D U M

Code-Making Panel 11

Sarah Caldwell, Project Administrator

January 30, 2019

SUBJECT: NEC® Second Draft FINAL Ballot Results (A2019)

According to the final ballot results, all ballot items received the necessary

affirmative votes to pass ballot.

15 Members Eligible to Vote

0 Members Not Returned

The attached report shows the number of affirmative, negative, and abstaining

votes as well as the explanation of the vote for each revision.

To pass ballot, each revision requires: (1) a simple majority of those eligible to

vote and (2) an affirmative vote of 2/3 of ballots returned. See Sections 3.3.4.3.(c)

and 4.3.10.1 of the Regulations Governing the Development of NFPA

Standards.

Second Revision No. 7658-NFPA 70-2018 [ Global Comment ]

Create a new section 430.246 and Table 430.252 (in Part XIV) as in the attached Word document.

Supplemental Information

File Name Description Approved

70_SR7658_Global.docx New section and table--for staff use

NEC_Global_SR-7658_430.26-new.docx For ballot

NEC_Global_SR-7658_Table_430.252.docx For ballot

Submitter Information Verification

Committee: NEC-P11

Submittal Date: Tue Oct 23 11:56:25 EDT 2018

Committee Statement

CommitteeStatement:

This Second Revision adds a new Table 430.252 to continue to use the overcurrent protective deviceprotecting the circuit for the sizing of equipment grounding conductors for motor circuits andequipment. This table was in the 2017 code as Table 250.122 but that table was revised at the FirstDraft stage (FR 8114) and no longer accurately applies to equipment grounding of motor circuits. The12.5 percent that is used for sizing equipment grounding conductors, for other than motor circuits, istypically based on overcurrent devices sized at 125 percent of the phase conductor ampacity.However, motor circuits may have a branch-circuit short-circuit and ground-fault protective devicesized at 400 percent of the motor current, which becomes a much greater percentage of the ampacityof the equipment grounding conductor. The second revision also incorporates language formerlylocated in Section 250.122 in a newly created Section 430.246 necessary for proper application ofTable 430.252 and to retain the requirements from the 2017 edition. The language in 430.246(F)(2)(b)was edited to clarify the method of connection for parallel conductors.

The panel has identified other areas that need to be addressed in regards to sizing the equipmentgrounding conductor for motor circuits, such as relief for supervised industrial installations. However,due to lack of public review, the panel will address those issues in the next cycle.

ResponseMessage:

SR-7658-NFPA 70-2018

Public Comment No. 914-NFPA 70-2018 [Section No. 430.245 [Excluding any Sub-Sections]]

Ballot Results

This item has passed ballot

15 Eligible Voters

0 Not Returned

14 Affirmative All

1 Affirmative with Comments

0 Negative with Comments

0 Abstention

Affirmative All

National Fire Protection Association Report https://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPar...

1 of 25 1/29/2019, 12:53 PM

Bas, Luis M.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe

Smith, III, Arthur J.

Waters, Keith

Widup, Ron

Affirmative with Comment

Cabaniss, John E.

If Table 250.122 remains the same as the 2017 Code then SR-7658 should not be approved.


2 of 25 1/29/2019, 12:53 PM

430.246 Size of Equipment Grounding Conductors. (A) General. Copper, aluminum, or copper-clad aluminum equipment grounding conductors of the wire type shall not be smaller than shown in Table 430.252, but in no case shall they be required to be larger than the circuit conductors supplying the equipment. Where a cable tray, a raceway, or a cable armor or sheath is used as the equipment grounding conductor, as provided in 250.118 and 250.134(1), it shall comply with 250.4(A)(5) or (B)(4).

Equipment grounding conductors shall be permitted to be sectioned within a multiconductor cable, provided the combined circular mil area complies with Table 430.252.

(B) Increased in Size. Where ungrounded conductors are increased in size from the minimum size that has sufficient ampacity for the intended installation, wire-type equipment grounding conductors, where installed, shall be increased in size proportionately, according to the circular mil area of the ungrounded conductors.

(C) Multiple Circuits. Where a single equipment grounding conductor is run with multiple circuits in the same raceway, cable, or cable tray, it shall be sized in accordance with Table 430.252 based on the largest overcurrent device protecting conductors in the raceway, cable, or cable tray. Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c).

(D) Motor Circuits. Equipment grounding conductors for motor circuits shall be sized in accordance with 430.246(D)(1) or (D)(2).

(1) General. The equipment grounding conductor size shall not be smaller than determined by 430.246(A) based on the rating of the branch circuit short-circuit and ground-fault protective device.

(2) Instantaneous-Trip Circuit Breaker and Motor Short-Circuit Protector. Where the overcurrent device is an instantaneous trip circuit breaker or a motor short-circuit protector, the equipment grounding conductor shall be sized not smaller than that given by 430.246(A) using the maximum permitted rating of a dual element time-delay fuse selected

for branch circuit short-circuit and ground-fault protection in accordance with 430.52(C)(1), Exception No. 1.

(E) Flexible Cord and Fixture Wire. The equipment grounding conductor in a flexible cord with the largest circuit conductor 10 AWG or smaller, and the equipment grounding conductor used with fixture wires of any size in accordance with 240.5, shall not be smaller than 18 AWG copper and shall not be smaller than the circuit conductors. The equipment grounding conductor in a flexible cord with a circuit conductor larger than 10 AWG shall be sized in accordance with Table 430.252.

(F) Conductors in Parallel. For circuits of parallel conductors as permitted in 310.10(G), the equipment grounding conductor shall be installed in accordance with 430.246(F)(1) or (F)(2).

(1) Conductor Installations in Raceways, Auxiliary Gutters, or Cable Trays.

(a) Single Raceway or Cable Tray. If conductors are installed in parallel in the same raceway or cable tray, a single wire-type conductor shall be permitted as the equipment grounding conductor. The wire-type equipment grounding conductor shall be sized in accordance with 430.246, based on the overcurrent protective device for the feeder or branch circuit. Wire-type equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c). Metal raceways or auxiliary gutters in accordance with 250.118 or cable trays complying with 392.60(B) shall be permitted as the equipment grounding conductor.

(b) Multiple Raceways. If conductors are installed in parallel in multiple raceways, wire-type equipment grounding conductors, where used, shall be installed in parallel in each raceway. The equipment grounding conductor installed in each raceway shall be sized in compliance with 430.246 based on the overcurrent protective device for the feeder or branch circuit. Metal raceways or auxiliary gutters in accordance with 250.118 or cable trays complying with 392.60(B) shall be permitted as the equipment grounding conductor.

(2) Multiconductor Cables.

(a) If multiconductor cables are installed in parallel, the equipment grounding conductor(s) in each cable shall be connected in parallel.

(b) If multiconductor cables are installed in parallel in the same raceway, auxiliary gutter, or cable tray, a single equipment grounding conductor that is sized in accordance with 430.246 shall be permitted to be connected together in parallel with the equipment grounding conductors provided within the multiconductor cables.

(c) Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c). Cable trays complying with 392.60(B), metal raceways in accordance with 250.118, or auxiliary gutters shall be permitted as the equipment grounding conductor.

(d) Except as provided in 430.246(F)(2)(b) for raceway or cable tray installations, the equipment grounding conductor in each multiconductor cable shall be sized in accordance with 430.246 based on the overcurrent protective device for the feeder or branch circuit.

(G) Motor Feeder Taps. Equipment grounding conductors run with motor feeder taps shall not be smaller than shown in Table 430.252 based on the rating of the overcurrent device ahead of the motor feeder but shall not be required to be larger than the tap conductors.

Table 430.252 Minimum Size Equipment Grounding Conductors for Grounding Motor Circuits and Equipment

Rating or Setting of Branch Circuit Short-Circuit and Ground-Fault Protective Device

in Circuit Ahead of Equipment, Conduit, etc., Not Exceeding

. (Amperes)

Size (AWG or kcmil)

Copper Aluminum or Copper-Clad Aluminum*

15 14 12

20 12 10

60 10 8

100 8 6

200 6 4

300 4 2

400 3 1

500 2 1/0

600 1 2/0

800 1/0 3/0

1000 2/0 4/0

1200 3/0 250

1600 4/0 350

2000 250 400

2500 350 600

3000 400 600

4000 500 750

5000 700 1200

6000 800 1200

Note: Where necessary to comply with 250.4(A)(5) or (B)(4), the equipment grounding conductor shall be sized larger than given in this table.

*See installation restrictions in 250.120.

Second Revision No. 7547-NFPA 70-2018 [ Definition: Thermally Protected (as applied

to motors). ]

Thermally Protected (as applied to motors).

The words Thermally Protected appearing on the nameplate of a A motor or motor-compressor indicatethat the motor is provided with a thermal protector. (CMP-11)


Committee: NEC-P11

Submittal Date: Mon Oct 22 13:39:51 EDT 2018

Committee Statement

CommitteeStatement:

The definition has been rewritten to comply with the NEC Style Manual. The term being definedshould not be included in the definition. The marking is covered by 430.7 and 440.4(A). Thischange is editorial in nature and is not introducing new material.

ResponseMessage:

SR-7547-NFPA 70-2018

Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith


3 of 25 1/29/2019, 12:53 PM

Widup, Ron


4 of 25 1/29/2019, 12:53 PM

Second Revision No. 7538-NFPA 70-2018 [ Definition: Controller. ]

Controller.

For the purpose of this article, a controller is any Any switch or device that is normally used to start andstop a motor by making and breaking the motor circuit current.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

The definition of “controller” contained the phrase “For the purpose of this Article”, which is notnecessary based on the added text in 430.2. The text has been removed for clarity. The termbeing defined has also been removed from the definition.

ResponseMessage:

SR-7538-NFPA 70-2018

Public Comment No. 870-NFPA 70-2018 [Section No. 430.2]

Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith


5 of 25 1/29/2019, 12:53 PM

Widup, Ron


6 of 25 1/29/2019, 12:53 PM

Second Revision No. 7542-NFPA 70-2018 [ Definition: Electronically Protected (as

applied to motors). ]

Electronically Protected (as applied to motors).

The words “electronically protected” appearing on the nameplate of a motor indicate that the A motor thatis provided with electronic control that is an integral part of the motor and protects the motor againstdangerous overheating due to failure of the electronic control, overload and failure to start.


Committee: NEC-P11


Committee Statement

Committee Statement: The definition has been rewritten to comply with the NEC Style Manual. The

term being defined should not be included in the definition.

Response Message: SR-7542-NFPA 70-2018

Public Comment No. 556-NFPA 70-2018 [Definition: Electronically Protected (as applied to motors).]

Public Comment No. 999-NFPA 70-2018 [Definition: Electronically Protected (as applied to motors).]

Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


7 of 25 1/29/2019, 12:53 PM


Waters, Keith

Widup, Ron


8 of 25 1/29/2019, 12:53 PM

Second Revision No. 7551-NFPA 70-2018 [ Definition: Part-Winding Motors. ]

Part-Winding Motors.

A part-winding start induction or synchronous motor is one that is arranged for starting by first energizingpart of its primary (armature) winding and, subsequently, energizing the remainder of this winding in oneor more steps. A standard part-winding start induction motor is arranged so that one-half of its primarywinding can be energized initially, and, subsequently, the remaining half can be energized, both halvesthen carrying equal current.

Informational Note: A hermetic refrigerant motor-compressor is not considered a standard part-winding start induction motor. See Article 440 .


Committee: NEC-P11


Committee Statement

CommitteeStatement:

This definition has been rewritten to comply with the NEC Style Manual. In accordance with 4.1.1of the Style Manual: “References shall not be made to an entire article”. The reference has beenremoved.

ResponseMessage:

SR-7551-NFPA 70-2018

Public Comment No. 998-NFPA 70-2018 [Definition: Part-Winding Motors.]

Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.


9 of 25 1/29/2019, 12:53 PM

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


10 of 25 1/29/2019, 12:53 PM

Second Revision No. 7565-NFPA 70-2018 [ Section No. 430.26 ]

430.26 Feeder Demand Factor.

Where reduced heating of the conductors results from motors operating on duty-cycle, intermittently, orfrom all motors not operating at one time, the authority having jurisdiction may grant permission for feederconductors to have an ampacity less than specified in 430.24, provided the conductors have sufficientampacity for the maximum load determined in accordance with the sizes and number of motors suppliedand the character of their loads and duties.

Informational Note: Demand factors determined in the design of new facilities can often bevalidated against actual historical experience from similar installations. For more information, seeIEEE 3004.8-2016, Recommended Practice for Motor Protection in Industrial and CommercialPower Systems .


Committee: NEC-P11


Committee Statement

CommitteeStatement:

IEEE 3004.8-2016 does not address demand factors, so this reference has been deleted.

CMP 11 does not agree with the substantiation provided by the submitter of public comment 2193for the following reasons. The submitter's substantiation states that IEEE 3004.8 containsrequirements. It is not an enforceable standard but only a recommended practice. Additionally, theIEEE voting process is an ANSI approved consensus process.

ResponseMessage:

SR-7565-NFPA 70-2018


Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.


11 of 25 1/29/2019, 12:53 PM

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


12 of 25 1/29/2019, 12:53 PM


430.96 Grounding.

Multisection motor control centers shall be connected together with an equipment grounding conductor oran equivalent equipment grounding bus sized in accordance with Table 250.122 Table 430.96 . Equipmentgrounding conductors shall be connected to this equipment grounding bus or to a grounding terminationpoint provided in a single-section motor control center.

Table 430.96 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment

Rating or Setting of Automatic Overcurrent Device in CircuitAhead of Equipment, Conduit, etc., Not Exceeding

(Amperes)

Size (AWG or kcmil)

CopperAluminum or Copper-

Clad Aluminum*

15 14 12

20 12 10

60 10 8

100 8 6

200 6 4

300 4 2

400 3 1

500 2 1/0

600 1 2/0

800 1/0 3/0

1000 2/0 4/0

1200 3/0 250

1600 4/0 350

2000 250 400

2500 350 600

3000 400 600

4000 500 750

5000 700 1200

6000 800 1200

Note: Where necessary to comply with 250.4(A)(5) or (B)(4), the equipment grounding conductor shall besized larger than given in this table.

*See installation restrictions in 250.120.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

This new Table 430.96 is the 2017 edition of Table 250.122. FR-8114 re-wrote 250.122 and Table250.122 for the 2020 NEC but did not show correlation with 430.96 and how it could affect motorcontrol centers. Adopting the 2017 NEC Table 250.122 in 430.96 will retain alignment with the UL845 MCC product standard (Table 24).

This SR would not be needed if CMP 5 moves back to the 2017 version of table 250.122 by notmoving forward with FR-8114.


13 of 25 1/29/2019, 12:53 PM

ResponseMessage:

SR-7609-NFPA 70-2018


Ballot Results


15 Eligible Voters

0 Not Returned

14 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


Cabaniss, John E.

If Table 250.122 remains the same as the 2017 Code then SR-7609 should not be approved.


14 of 25 1/29/2019, 12:53 PM

Second Revision No. 7603-NFPA 70-2018 [ Section No. 430.98(A) ]

(A) Motor Control Centers.

Motor control centers shall be marked according to 110.21, and the marking shall be plainly visible afterinstallation. Marking shall also include common power bus current rating and motor control center short-circuit current rating.


Committee: NEC-P11


Committee Statement

Committee Statement: This revision is correcting the terminology.



Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


15 of 25 1/29/2019, 12:53 PM


(A) Branch/Feeder Circuit Conductors.

Circuit conductors supplying power conversion equipment included as part of an adjustable-speed drivesystem shall have an ampacity not less than 125 percent of the rated input current to the powerconversion equipment.

Informational Note No. 1: Power conversion equipment can have multiple power ratings andcorresponding input currents.

Informational Note No. 2: Circuit conductors on the output of an adjustable-speed drive system aresusceptible to breakdown under certain conditions due to the characteristics of the outputwaveform of the drive. Factors affecting the conductors include but are not limited to the outputvoltage, frequency, and current, the length of the conductors, the spacing between the conductors,and the dielectric strength of the conductor insulation. Methods to mitigate breakdown includeconsideration of one or more of these factors.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

The added Informational Note draws attention to potential risks involving possible damage to theequipment and conductors on the output of an adjustable-speed drive system. There are multipleways to mitigate the risks so a specific method was not included in this revision.

ResponseMessage:

SR-7597-NFPA 70-2018

Public Comment No. 2187-NFPA 70-2018 [Section No. 430.122(A)]

Ballot Results


15 Eligible Voters

0 Not Returned

14 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.


16 of 25 1/29/2019, 12:53 PM

Hinson, Tim

Mueller, Dirk R. F.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron

Negative with Comment

Neubauer, Arthur S.

The addition of the proposed informational note does not provide the necessary information to the installer of theequipment to be able to tell when he/she must consider the note. The informational note implies that all driveshave this potential problem under "certain conditions". This is not the case.


17 of 25 1/29/2019, 12:53 PM

Second Revision No. 7641-NFPA 70-2018 [ Section No. 430.122(B) ]

(B) Output Conductors.

The output conductors from between the power conversion equipment to and the motor shall have anampacity not less equal to or larger than 125 percent of the motor full-load current as determined by430.6 430.6(A) or (B) .

Exception: If the power conversion equipment is listed and marked as “Suitable for Output MotorConductor Protection,” the conductor between the power conversion equipment and the motor shallhave an ampacity equal to or greater than the larger of:

(1) 125 percent of the motor full load current as determined by 430.6(A) or (B)

(2) The ampacity of the minimum conductor size marked on the power conversion equipment

Informational Note: The minimum ampacity required of output conductors is often different than thatof the conductors supplying the power conversion equipment. See 430.130 and 430.131 for branchcircuit protection requirements.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

Drive technology is capable of providing output conductor short-circuit and ground-fault protection.UL 61800-5-1 has been updated to allow an AC drive to be marked for protecting its outputconductors in individual-motor installations. This change permits the use of such a drive to decouplethe output conductor sizing from the branch-circuit short-circuit ground-fault protective device sizing.The panel has changed 430.6 to 430.6 (A) or (B) to be more specific on what table should be used.This action answers the question posed by the CC.

ResponseMessage:

SR-7641-NFPA 70-2018


Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.


18 of 25 1/29/2019, 12:53 PM

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


19 of 25 1/29/2019, 12:53 PM

Second Revision No. 7688-NFPA 70-2018 [ Section No. 430.122(D) ]

(D) Several Motors or a Motor and Other Loads.

Conductors supplying several motors or a motor and other loads, including power conversion equipment,shall have ampacity in accordance with 430.24, using the rated input current of the power conversionequipment as the considered full-load motor current for purposes of calculating ampacity.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

The term “considered full-load motor current” lacked clarity. It was unnecessary so it wasremoved.


Public Comment No. 1002-NFPA 70-2018 [Section No. 430.122(B)]

Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim

Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


20 of 25 1/29/2019, 12:53 PM


(A) Circuits Containing Power Conversion Equipment.

Circuits containing power conversion equipment shall be protected by a branch circuit short-circuit andground-fault protective device in accordance with all of the following:

(1) The rating and type of protection shall be determined by 430.52(C)(1), (C)(3), (C)(5), or (C)(6), usingthe full-load current rating of the motor load as determined by 430.6 430.6(A) or (B) .

Exception to 1: Where the power conversion equipment is listed and additionally marked “Suitablefor Output Motor Conductor Protection,” the maximum rating of the designated motor branch-circuitshort-circuit and ground-fault protective device in Table 430.52 The rating and type of protectionshall be permitted to be determined by replacing the motor full-load current with the Table 430.52using the power conversion equipment’s rated input current where the power conversionequipment is listed and marked “Suitable for Output Motor Conductor Protection.”

Informational Note No. 1: Motor conductor branch circuit short-circuit and ground-faultprotection is provided by from the power conversion equipment when to the motor is providedby power conversion equipment that is listed and additionally marked “Suitable for OutputMotor Conductor Protection.” per the product standard

Informational Note No. 2: A motor branch circuit using power conversion equipment, includingequipment listed and marked “Suitable for Output Motor Conductor Protection,” includes theinput circuit to the power conversion equipment.

(2) Where maximum branch circuit short-circuit and ground-fault protective ratings are stipulated forspecific device types in the manufacturer's instructions for the power conversion equipment or areotherwise marked on the equipment, they shall not be exceeded even if higher values are permittedby 430.130(A)(1).

(3) A self-protected combination controller shall only be permitted where specifically identified in themanufacturer’s instructions for the power conversion equipment or if otherwise marked on theequipment.

Informational Note: The type of protective device, its rating, and its setting are often marked onor provided with the power conversion equipment.

(4) Where an instantaneous trip circuit breaker or semiconductor fuses are permitted in accordance withthe drive manufacturer’s instructions for use as the branch circuit short-circuit and ground-faultprotective device for listed power conversion equipment, they shall be provided as an integral part ofa single listed assembly incorporating both the protective device and power conversion equipment.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

Drive technology is capable of providing output conductor short-circuit and ground-fault protection.UL 61800-5-1 has been updated to allow power conversion equipment to be marked for protectingits output conductors in individual-motor installations. This change permits the use of such powerconversion equipment to decouple the output conductor sizing from the branch circuit protectivedevice sizing.

The section has been revised to address Correlating Committee concerns as follows. The referenceto 430.6 has been updated to clarify that it is not inclusive of the requirements in 430.6(C). Thephrase “per the product standard” has been removed since this is not used in the NEC document.The use of the word "when" was removed as this is not time related.

Overall, the exception and informational note were revised to simplify the requirement and to reduceconfusion. A second informational note was added to clarify power conversion equipment is not an


21 of 25 1/29/2019, 12:53 PM

overcurrent protection device.

ResponseMessage:

SR-7677-NFPA 70-2018


Ballot Results


15 Eligible Voters

0 Not Returned

13 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Hinson, Tim

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


Mueller, Dirk R. F.

With respect to feeder and branch circuit definitions, this revision does not establish a drive marked and used as“suitable for output motor conductor protection” as the final overcurrent protective device. The branch circuit short-circuit and ground-fault protective device as required by Part IV of Article 430 should be considered the finalovercurrent protective device.

Negative with Comment

Guidry, Paul E.

I am voting Negative on this SR for two reasons. 1. The panel has added Informational Note 2, which seeminglytries to redefine the definition and intent of a "branch circuit" found in Art. 100. This would violate NEC Style GuideSection 3.1.3. In cases where power conversion equipment provides motor conductor protection, according to thedefinition of a "branch circuit" in Art. 100, the motor branch circuit would begin at the output terminals of the powerconversion equipment, and the breaker/fuse/conductors ahead of the power conversion equipment would actuallybe a "feeder" by definitions found in Art. 100. 2. As presented during the CMP meeting, when power conversionequipment, such as a VFD, is listed as a combination motor controller then the entire assembly, including the VFD,is part of the motor branch circuit per current product standards. While this may be how the product standards arecurrently written, I disagree with the principle. Since power conversion equipment is actually a new power source(voltage changes, frequency, wave form, etc.) and may contain protection for the equipment downstream, I believe


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either the product standards should be revised to align with the current definition of "branch circuit" in Art. 100, ora new definition in the NEC should be added to Art. 430.2 to define this alternative type of "branch circuit" insteadof trying to define the concept with an informational note.


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440.32 Single Motor-Compressor.

Branch-circuit conductors supplying a single motor-compressor shall have an ampacity not less than thegreater of:

(1) 125 percent of either the motor-compressor rated-load current or

(2) 125 percent of the branch-circuit selection current, whichever is greater.

For a wye-start, delta-run connected motor-compressor, the selection of branch-circuit conductorsbetween the controller and the motor-compressor shall be permitted to be based on 72 percent of eitherthe motor-compressor rated-load current or the branch-circuit selection current, whichever is greater.

Informational Note: The individual motor circuit conductors of wye-start, delta-run connected motor-compressors carry 58 percent of the rated load current. The multiplier of 72 percent is obtained bymultiplying 58 percent by 1.25.


Committee: NEC-P11


Committee Statement

CommitteeStatement:

It is the intent that the 125% be applied to either the branch-circuit selection current or the ratedload current, whichever is greater. This revision clarifies the language.

ResponseMessage:

SR-7691-NFPA 70-2018


Ballot Results


15 Eligible Voters

0 Not Returned

15 Affirmative All



0 Abstention

Affirmative All

Bas, Luis M.

Cabaniss, John E.

Cole, Terry D.

Cosic, Zivorad

Deachin, Donald P.

Fahey, Robert G.

Guidry, Paul E.

Hinson, Tim


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Mueller, Dirk R. F.

Neubauer, Arthur S.

Novak, Jebediah J.

Schomaker, Joe


Waters, Keith

Widup, Ron


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Documents

TO: Code-Making Panel 11