MEMORANDUM. According to the final ballot results, all ballot items received the necessary affirmative votes to pass ballot.

Transcription

1 National Fire Protection Association 1 Batterymarch Park, Quincy, MA Phone: Fax: MEMORANDUM To: NEC Code-Making Panel 6 From: Kimberly Shea, Project Administrator Date: April 16, 2015 Subject: NEC First Draft TC FINAL Ballot Results (A2016) According to the final ballot results, all ballot items received the necessary affirmative votes to pass ballot. 12 Members Eligible to Vote 0 Not Returned 4 Members Voted Affirmative with Comment on one or more Revision (Huddleston Jr, Kent, Laideler, Picard) 4 Members Voted Negative on one or more Revisions (Huddleston, Kent, Xeri, Zimmoch) 1 Member Abstained on one or more Revisions (Picard) The attached report shows the number of affirmative, negative, and abstaining votes as well as the explanation of the vote for each first revision. There are two criteria necessary for each first revision to pass ballot: (1) simple majority and (2) affirmative 2 / 3 vote. The mock examples below show how the calculations are determined. (1) Example for Simple Majority: Assuming there are 20 vote eligible committee members, 11 affirmative votes are required to pass ballot. (Sample calculation: 20 members eligible to vote 2 = = 11) (2) Example for Affirmative 2 / 3 : Assuming there are 20 vote eligible committee members and 1 member did not return their ballot and 2 members abstained, the number of affirmative votes required would be 12. (Sample calculation: 20 members eligble to vote 1 not returned 2 abstentions = 17 x 0.66 = = 12 ) As always please feel free to contact me if you have any questions.

2 of 98 4/15/ :10 PM First Revision No NFPA [ Global Input ] Change title of Article 400 to Flexible Cords and Flexible Cables Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 17:01:44 EST 2015 Committee Statement Committee Statement: This is being done to mirror the scope of the article in 400.1, and also to clear up any misconceptions that might lead one to believe that this article covers the cable wiring methods addressed in Chapter three. Response Message: Public Input No NFPA [Article 400] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Page 1 of 101

3 of 98 4/15/ :10 PM Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 2 of 101

4 of 98 4/15/ :10 PM First Revision No NFPA [ Global Input ] See attached file for renumbering in Articles 400 and 402 Supplemental Information File Name Panel_6_Global_FR_1519_cjf_renumbering.docx Description Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Jan 20 13:25:27 EST 2015 Committee Statement Committee Statement: This will make the NEC more user friendly by following an already established pattern that the.10 and.12 sections of an article is uses permitted and uses not permitted, respectively. Response Message: Public Input No NFPA [Section No ] Public Input No NFPA [Section No ] Public Input No. 796-NFPA [Section No ] Public Input No. 804-NFPA [Section No ] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Page 3 of 101

5 of 98 4/15/ :10 PM Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 4 of 101

6 Article 400 & ed. Revision Page 5 of 101

7 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (H)(5) ] (5) Equipment Bonding Grounding Conductors. Where parallel equipment bonding grounding conductors are used, they shall be sized in accordance with Sectioned equipment bonding grounding conductors smaller than 1/0 AWG shall be permitted in multiconductor cables, provided that if the combined circular mil area of the sectioned equipment bonding grounding conductors in each cable complies with Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 09:20:22 EST 2015 Committee Statement Committee Statement: PI 3476 adds clarity and complies with the Style Manual. PI The change from "grounding" to "bonding" in the 2014 NEC was inadvertent. CMP-6 accepted the change only if CMP-5 accepted changing from "equipment grounding conductor" to "equipment bonding conductor". Since CMP-5 did not accept that change, the TCC directed that ROP 6-13 be recorded as a "reject". Therefore, the change from "grounding" to "bonding" was in error and needs to be changed back. Response Message: Public Input No NFPA [Section No (H)(5)] Public Input No NFPA [Section No (H)(5)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Page 6 of 101

8 of 98 4/15/ :10 PM Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 7 of 101

9 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (A)(2) ] (2) Selection of Ampacity. Where more than one ampacity applies for a given circuit length, the lowest value shall be used. Exception: Where two different ampacities apply to adjacent portions of a circuit, the higher ampacity shall be permitted to be used beyond the point of transition, a distance equal to if the total portion(s) of the circuit with lower ampacity does not exceed the lesser of 3.0 m (10 ft) or 10 percent of the circuit length figured at the higher ampacity, whichever is less total circuit. Informational Note: See (C) for conductor temperature limitations due to termination provisions. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 12:58:15 EST 2015 Committee Statement Committee Statement: The present text of (A)(2) is correct, and the ampacity of that portion of the circuit with higher ampacity may be used for the circuit ampacity, even if one or more parts of the circuit have lower ampacity, as long as the total of the parts with lower ampacity do not exceed the lesser of 10 ft. or 10% of the total circuit length. The parts of the circuit with lower ampacity do not have to be adjacent. This exception should not be used in conjunction with (B)(3)(a). Response Message: Public Input No NFPA [Section No (A)(2)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Page 8 of 101

10 of 98 4/15/ :10 PM Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 9 of 101

11 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (B)(3) ] Page 10 of 101

12 0 of 98 4/15/ :10 PM (3) Adjustment Factors. Page 11 of 101

13 1 of 98 4/15/ :10 PM (a) More Than than Three Current-Carrying Conductors. Where the number of currentcarrying conductors in a raceway or cable exceeds three, or where single conductors or multiconductor cables are installed without maintaining spacing for a continuous length longer than 600 mm (24 in.) and are not installed in raceways, the allowable ampacity of each conductor shall be reduced as shown in Table (B)(3)(a). Section (A)(2) exception shall not apply. Each current-carrying conductor of a paralleled set of conductors shall be counted as a current-carrying conductor. Where conductors of different systems, as provided in 300.3, are installed in a common raceway or cable, the adjustment factors shown in Table (B)(3)(a) shall apply only to the number of power and lighting conductors (Articles 210, 215, 220, and 230). Informational Note No. 1: See Annex B for adjustment factors for more than three current-carrying conductors in a raceway or cable with load diversity. Informational Note No. 2: See (A) for adjustment factors for conductors and ampacity for bare copper and aluminum bars in sheet metal auxiliary gutters and (B) for adjustment factors for conductors in metal wireways. (1) Where conductors are installed in cable trays, the provisions of shall apply. (2) Adjustment factors shall not apply to conductors in raceways having a length not exceeding 600 mm (24 in.). (3) Adjustment factors shall not apply to underground conductors entering or leaving an outdoor trench if those conductors have physical protection in the form of rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit (PVC), or reinforced thermosetting resin conduit (RTRC) having a length not exceeding 3.05 m (10 ft), and if the number of conductors does not exceed four. (4) Adjustment factors shall not apply to Type AC cable or to Type MC cable under the following conditions: a. The cables do not have an overall outer jacket. b. Each cable has not more than three current-carrying conductors. c. The conductors are 12 AWG copper. d. Not more than 20 current-carrying conductors are installed without maintaining spacing, are stacked, or are supported on bridle rings. Exception: A 60 percent adjustment factor shall be applied if the current-carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing exceeds 20. (5) An adjustment factor of 60 percent shall be applied to Type AC cable or Type MC cable under the following conditions: a. The cables do not have an overall outer jacket. b. The number of current carrying conductors exceeds 20. c. The cables are stacked or bundled longer that 600 mm (24 in. ) without spacing being maintained. Table (B)(3)(a) Adjustment Factors for More Than than Three Current-Carrying Conductors Number of Conductors 1 Percent of Values in Table (B)(16) through Table (B)(19) as Adjusted for Ambient Temperature if Necessary Page 12 of 101

14 2 of 98 4/15/ :10 PM Number of Conductors 1 Percent of Values in Table (B)(16) through Table (B)(19) as Adjusted for Ambient Temperature if Necessary and above 35 1 Number of conductors is the total number of conductors in the raceway or cable, including spare conductors. The count shall be adjusted in accordance with (B)(5) and (6). The count shall not include conductors that are connected to electrical components but that cannot be simultaneously energized. (b) Raceway Spacing. Spacing between raceways shall be maintained. (c) Raceways and Cables Exposed to Sunlight on Rooftops. Where raceways or cables are exposed to direct sunlight on or above rooftops, the adjustments shown in Table (B) (3)(c) raceways or cables shall be installed a minimum distance above the roof to the bottom of the raceway or cable of 23 mm ( 7 8 in.). Where the distance above the roof to the bottom of the raceway is less than 23 mm ( 7 8 in.), a temperature adder of 33 C (60 F) shall be added to the outdoor temperature to determine the applicable ambient temperature for application of the correction factors in Table (B)(2)(a) or Table (B)(2)(b). Exception: Type XHHW-2 insulated conductors shall not be subject to this ampacity adjustment. Informational Note: One source for the ambient temperatures in various locations is the ASHRAE Handbook Fundamentals. Table (B)(3)(c) Ambient Temperature Adjustment for Raceways or Cables Exposed to Sunlight on or Above Rooftops Temperature Adder Distance Above Roof to Bottom of Raceway or Cable C F On roof 0 13 mm (0 1 2 in.) Above roof 13 mm 90 mm ( 1 2 in in.) Above 90 mm 300 mm (3 1 2 in. 12 in.) Above 300 mm 900 mm (12 in. 36 in.) Informational Note to Table (B)(3)(c): The temperature adders in Table (B)(3)(c) are based on the measured temperature rise above the local climatic ambient temperatures due to sunlight heating. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 13:12:09 EST 2015 Committee Statement Page 13 of 101

15 13 of 98 4/15/ :10 PM Committee Statement: PI 3375: This text revision restores the requirement to that intended by the committee. The previous text unintentionally restricted the installation of all Type MC and Type AC cables. Based on additional information submitted from multiple sources, the rooftop adders were deleted, with the exception of wiring methods placed in direct contact with the roof surface. This information includes: Public Input 3373, which proposes to delete the adders with the exception of wiring methods placed directly on the rooftop. This public input was based on the work of a task group formed by the NEC Correlating Committee and assigned to review and investigate the rooftop adders. The basis for the substantiation states that the present NEC method for derating conductor ampacity without the rooftop adders is more than adequate is based on the fact that the existing ampacity tables were developed prior to the introduction of the insulation types currently being used and the ampacity tables and temperature correction values have not changed since. Additional findings proved that the heat inside a raceway insulates it from solar radiation; therefore, the thermal effects of rooftop installations are not additive. The research indicates that wiring methods placed directly on the rooftop will have higher internal temperatures. This public input further indicates that the original testing submitted to the code-making panel failed to account for multiple methods of heat dissipation experienced in actual installations. Public Input 3232, which proposes to delete the rooftop adders. Testing submitted indicates that wiring methods sized appropriately for the load and located on rooftops anywhere in the United States will not exceed their temperature rating, even without these adders. The submitted report also shows that even using the ambient temperature correction factors in Table (B)(2)(a) results in a conservative allowable ampacity. The test setup collected data from wiring methods that were not in direct contact with the roof surface. Modeling and testing was performed at a public university to support this Public Input. Public Input 2809, which seeks complete relief from the provisions in the NEC for rooftop adders installed in industrial installations. Industrial buildings are installed in the same locations as commercial and residential buildings, all of which are subject to the same rooftop conditions. Public Input 1947, which correctly points out that no documented conductor failures due to exposure to direct sunlight have been reported to the panel. Changing the reference to and deleting sheet metal from the informational note does not diminish the purpose of the informational note, which is to direct the user to the appropriate article. Also, the text submitted in the public input did not show Table (B)(2)(a). The assumption is that this was done for clarity and there was no intent to delete the table. PI 1713: Remove "but" from the footnote of Table (B)(3)(a). The word "but" is awkward and should be removed. Public Input No. 1-NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Page 14 of 101

16 4 of 98 4/15/ :10 PM Public Input No NFPA [Section No (B)(3)] Public Input No NFPA [Section No (B)(3)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 6 Affirmative All 3 Affirmative with Comments 2 Negative with Comments 1 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Affirmative with Comment Huddleston, Jr., Robert L. The task group that was appointed by NFPA to explore rooftop ampacity adjustments did an admirable job of putting the issue to rest. The arbitrary 7/8" height above the roof that this FR requires raceways and cables should be decreased to 3/4", which would not disallow many commonly used spacers, such as a 1" planed wooden board. Also, the exception in this FR uses the terminology "ampacity adjustment", which should be changed to "correction factor". Kent, Gerald W. While there is much evidence direct sunlight does add to the ambient temperature inside the conduit in direct sunlight, studies have also shown the apparent overages in temperature correction factors of Table (B)(2)(a) makes an increase in the correction factor unnecessary. A study by the task group to determine proper correction factors should be done to update Table (B)(2)(a) at which time the deletion of Table (B)(3)(c) would need to be revisited. Laidler, William F. We are voting in favor of this first revision despite a disagreement with new language added to (B)(3)(a). The new language would not allow the option to use the exception to (A)(2) where there are more than three current carrying conductors in a raceway or cable. The exception allows the higher ampacity to be used for either 10% or 10 whichever is less. This exception should apply for either temperature correction or adjustment for number of conductors over three in a raceway or cable. The driving change in FR 1503 is the language change in (B)(3)(c) Rooftops. We have reversed our position on this issue because of new data. In previous cycles we felt strongly about our votes to retain the temperature adders based on the data provided at the time. In response to PI since the 2005 code cycle Panel 6 has invested many hours addressing the issue of sunlight exposure on rooftops and the impact that exposure has on the allowable ampacity of conductors. Most importantly- all the time invested providing recommendations, research and studies done by the electrical industry. At the end of the 2014 cycle the Panel requested that the Correlating Committee to a point a independent task group to address the concerns of Panel 6 ward. These concerns were the origination of the provided values in the ampacity tables and that all the variables of these types of installations were being considered. PI 3773 was submitted as the end result of the Page 15 of 101

17 5 of 98 4/15/ :10 PM work done per request of Panel 6. Those involved with the work were cautious to insure that they used data from previous studies, provided an open invitation to contribute and the study was done by using impartial volunteers outside of the industry to record data and creating computer modeling. These factors alone strengthen the validity of the testing. The task group came back and said for the most part up no one was wrong. The end result of the testing demonstrated that providing an additional temperature adder on top of the ambient was not necessary due to the thermal dynamic effects of heat dissipation when conduits are exposed to sunlight. As the conduit began to heat up on the outside it actually acted as an insulator so the temperature of the conductors were not affected as much as previously thought. The only installation that showed that there was a problem was when the raceway was placed directly on the roof. This group was also able to trace back the origination of the existing ampacity values. These values are based on testing that was done with code grade rubber. The types of materials used in today s insulation are far superior to code grade rubber. The work done by this task group is groundbreaking and it s important that Panel 6 moves forward with their recommendations. Negative with Comment Xerri, Mario The work performed by the University of Wisconsin for the benefit of the task group was based solely on modeling. While we support modeling, and the work done by the University, there was no testing performed to validate any of the assumptions and conclusions presented. For the limited cases modeled, which did not include any cable wiring systems, the model seemed to verify some of the conclusions made by the task group. However, the assumptions and results of this model were never validated by any laboratory testing with actual rooftops and wiring systems exposed to sunlight as was done with previous Fact-Finding Investigations. We would like to see more laboratory testing before the comment stage to verify the results of the model and the conclusions made by the task group before a final decision is made on the appropriateness of deleting these temperature adders. Zimnoch, Joseph S. The information provided to the Panel was incomplete and unscientific. Materials were unavailable to many Panel members until the Public Input meeting and not available for advance review by members. - The submitted Task Group work did not review and incorporate data from past work into its model resulting in assumptions in the model that are inaccurate. The design of the experimentation had many flaws that rendered the scientific applicability questionable, at best. Among examples, the Task Group and the model did not take into account white roofs that reflect sunlight onto conduit when raised up off the roof. The model also did not take into account more than three current carrying conductors in a conduit. Thermal modeling is an accepted industry practice when the assumptions are confirmed via testing. Unfortunately the model assumptions were not confirmed with actual testing. Past testing that was accepted by the panel, show the assumed variables in the model to be incorrect. - The UNLV test report is flawed in many ways. The following is a summary of the report and does not include all inconsistencies in the report. Submitted testing from UNLV only energized one of the ten installations where only 2 of 4 size 12 AWG copper conductors were energized in ½ inch RMC. The 2 conductors were energized at 14.8 amps on a 20 amp rated cable from the 60C ampacity column of Table (B)(16). This ampacity is based on 3 current carrying conductors and then was derated based on 4 conductors in the conduit even though only 2 conductors were energized. The week the collected data was analyzed was selected at random rather than worst case. The measured 30F temperature rise re-enforcing the current values when 8 inches off the roof corresponds per Table 31.15(B)(3)(c). It was also noted that the temperature rise was notable higher on the jacketed MC Cable than the RMC. Resulting temperature of the two energized conductors was 67.5C which would exceed the maximum temperature rating of a 60C rated conductor. The conclusion of unlikely that wiring methods sized appropriately for the load and located on rooftops anywhere in the United States will ever exceed their rated insulation temperature contradicts the only energized circuit data found in the report. Abstention Picard, Paul R. Page 16 of 101

18 6 of 98 4/15/ :10 PM The Aluminum Association supports the changes to the AC and MC ampacity adjustment factors; however, we could not reach consensus on the changes to (B)(3)(c). Therefore, we will abstain on this FR. Page 17 of 101

19 7 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (B)(7) ] (7) 120/240-Volt, Single-Phase Dwelling Services and Feeders. For one-family dwellings and the individual dwelling units of two-family and multifamily dwellings, service and feeder conductors supplied by a single-phase, 120/240-volt system shall be permitted to be sized in accordance with (B)(7)(1) through (4). Single-phase feeders from a 208Y/120 volt system shall be permitted to use (B)(7)(1) through (4). (1) For a service rated 100 through 400 A amperes, the service conductors supplying the entire load associated with a one-family dwelling, or the service conductors supplying the entire load associated with an individual dwelling unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than 83 percent of the service rating. (2) For a feeder rated 100 through 400 A amperes, the feeder conductors supplying the entire load associated with a one-family dwelling, or the feeder conductors supplying the entire load associated with an individual dwelling, unit in a two-family or multifamily dwelling, shall be permitted to have an ampacity not less than 83 percent of the feeder rating. (3) In no case shall a feeder for an individual dwelling unit be required to have an ampacity greater than that specified in (B)(7)(1) or (2). (4) Grounded conductors shall be permitted to be sized smaller than the ungrounded conductors, provided that if the requirements of and for service conductors or the requirements of and for feeder conductors are met. (5) Where correction or adjustment factors are required by (B)(2) or (3), they shall be permitted to be applied to the ampacity associated with the temperature rating of the conductor. Informational Note No. 1: The conductor ampacity may require other correction or adjustment factors applicable to the conductor installation. The service or feeder ratings addressed by this section are based on the standard ampacity ratings from 240.6(A). Informational Note No. 2: See Example D7 in Annex D. Supplemental Information File Name Panel_6_FR_1513_cjf.docx Description Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Page 18 of 101

20 8 of 98 4/15/ :10 PM Submittal Date: Mon Jan 19 14:16:57 EST 2015 Committee Statement Committee Statement: The Canadian Electrical Code allows reduced conductor sizes for single dwellings, apartments and similar buildings for both 120/240 and 120/208 V feeder conductors. This revised language will contribute to harmonization of the NEC and CE Code requirements. The load diversity in residential applications is similar whether the residence is fed with 120/240 or 120/208; therefore, 120/208 will be added to (B)(7). Temperature correction and adjustment factors are required in certain applications by (B)(2) and (B)(3)(a). The added language in list item (5) clarifies their application. Response Message: Public Input No NFPA [Section No (B)(7)] Public Input No NFPA [Section No (B)(7)] Public Input No NFPA [Section No (B)(7)] Public Input No NFPA [Section No (B)(7)] Public Input No NFPA [Section No (B)(7)] Public Input No NFPA [Section No (B)(7)] Public Input No NFPA [Section No (B)(7)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 10 Affirmative All 0 Affirmative with Comments 2 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 19 of 101

21 9 of 98 4/15/ :10 PM Negative with Comment Huddleston, Jr., Robert L. 1. Section (C)(1), which (4) references in the FR, states: Prohibited Reductions. There shall be no reduction of the neutral or grounded conductor capacity applied to the amount in (C)(1) or portion of the amount in (C)(2) from that determined by the basic calculation: (1) any portion of the 3-wire circuit consisting of 2 ungrounded conductors and the neutral conductor of a 4-wire, wye-connected 3-phase system. 2. Section (B)(5)(b) states: In a 3-wire circuit consisting of two phase conductors and the neutral conductor of a 4-wire, 3-phase wye-connected system, a common conductor carries approximately the same current as the line-to-neutral load currents of the other conductors and shall be counted when applying the provisions of (B)(3)(a). 3. In addition, the ampacity adjustment for the grounded conductor allowed in single-phase 120/240 volt systems is based on the fact that when the two phase conductor currents are balanced, there is no current at all in the grounded conductor. If the two phase conductor currents are not identical, the grounded conductor only carries the imbalance, which is generally a very low amount of current. Because of this, the neutral is not really considered a current-carrying conductor and it does not produce heat in the raceway or cabling encasing the feeder. However, if the grounded conductor conducts significant current, as it would in a 3-wire 208/120 volt system, heat would be generated in this conductor. This should eliminate the reduction in sizing that FR 1504 allows. Kent, Gerald W. No technical substantiation was provide to allow for this change. In a 120/240v systems, heat is generated in effectively two conductors under full load. In a fully loaded 120/208v system, heat would be generated in all three conductors. Time honored tradition has shown the deductions work for 120/240v systems I believe due to the 'zero' effect of the neutral load that would not be present in 120/208v system. Page 20 of 101

22 Page 21 of 101

23 0 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (C) ] Page 22 of 101

24 1 of 98 4/15/ :10 PM (C) Engineering Supervision. Page 23 of 101

25 2 of 98 4/15/ :10 PM Under engineering supervision, conductor ampacities shall be permitted to be calculated by means of the following general equation: [310.15(C)] where: Tc = = conductor temperature in degrees Celsius ( C) Ta = = ambient temperature in degrees Celsius ( C) Rdc = = dc resistance of 305 mm (1 ft) of conductor in microohms at temperature, Tc Yc = = component ac resistance resulting from skin effect and proximity effect Rca = = effective thermal resistance between conductor and surrounding ambient Table (B)(16) (formerly Table ) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60 C Through 90 C (140 F Through 194 F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30 C (86 F)* Size AWG or kcmil 60 C (140 F) Types TW, UF Temperature Rating of Conductor [See Table (A).] 75 C (167 F) Types RHW, THHW, THW, THWN, XHHW, USE, ZW COPPER 90 C (194 F) Types TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 60 C (140 F) Types TW, UF 75 C (167 F) Types RHW, THHW, THW, THWN, XHHW, USE 90 C (194 F) Types TBS, SA, SIS, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 ALUMINUM OR COPPER-CLAD ALUMINUM 18** 14 16** 18 14** ** ** 10** ** / /0 2/ /0 3/ /0 4/ /0 Size AWG or kcmil Page 24 of 101

26 3 of 98 4/15/ :10 PM *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 30 C (86 F). Refer to (B)(3)(a) for more than three current-carrying conductors. **Refer to 240.4(D) for conductor overcurrent protection limitations. Table (B)(17) (formerly Table ) Allowable Ampacities of Single-Insulated Conductors Rated Up to and Including 2000 Volts in Free Air, Based on Ambient Temperature of 30 C (86 F)* Size AWG or kcmil 60 C (140 F) Types TW, UF Temperature Rating of Conductor [See Table (A).] 75 C (167 F) Types RHW, THHW, THW, THWN, XHHW, ZW COPPER 90 C (194 F) Types TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 60 C (140 F) Types TW, UF 75 C (167 F) Types RHW, THHW, THW, THWN, XHHW 90 C (194 F) Types TBS, SA, SIS, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 ALUMINUM OR COPPER-CLAD ALUMINUM ** ** ** 10** ** Page 25 of 101 Size AWG or kcmil

27 4 of 98 4/15/ :10 PM / /0 2/ /0 3/ /0 4/ / *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 30 C (86 F). **Refer to 240.4(D) for conductor overcurrent protection limitations. Table (B)(18) (formerly Table ) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 150 C Through 250 C (302 F Through 482 F). Not More Than Three Current-Carrying Conductors in Raceway or Cable, Based on Ambient Air Temperature of 40 C (104 F)* Size AWG or kcmil 150 C (302 F) Type Z Temperature Rating of Conductor [See Table (A).] 200 C (392 F) Types FEP, FEPB, PFA, SA COPPER 250 C (482 F) 150 C (302 F) Types PFAH, TFE NICKEL OR NICKEL- COATED COPPER Type Z ALUMINUM OR COPPER-CLAD ALUMINUM Page 26 of 101 Size AWG or kcmil

28 5 of 98 4/15/ :10 PM Size AWG or kcmil 150 C (302 F) Type Z Temperature Rating of Conductor [See Table (A).] 200 C (392 F) Types FEP, FEPB, PFA, SA COPPER 250 C (482 F) 150 C (302 F) Types PFAH, TFE NICKEL OR NICKEL-COATED COPPER Type Z ALUMINUM OR COPPER-CLAD ALUMINUM / /0 2/ /0 3/ /0 4/ /0 Size AWG or kcmil *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 40 C (104 F). Refer to (B)(3)(a) for more than three current-carrying conductors. Table (B)(19) (formerly Table ) Allowable Ampacities of Single-Insulated Conductors, Rated Up to and Including 2000 Volts, 150 C Through 250 C (302 F Through 482 F), in Free Air, Based on Ambient Air Temperature of 40 C (104 F)* Size AWG or kcmil 150 C (302 F) Type Z Temperature Rating of Conductor [See Table (A).] 200 C (392 F) Types FEP, FEPB, PFA, SA COPPER 250 C (482 F) 150 C (302 F) Types PFAH, TFE NICKEL, OR NICKEL-COATED COPPER Type Z ALUMINUM OR COPPER-CLAD ALUMINUM / /0 Size AWG or kcmil Page 27 of 101

29 6 of 98 4/15/ :10 PM Size AWG or kcmil 150 C (302 F) Type Z Temperature Rating of Conductor [See Table (A).] 200 C (392 F) Types FEP, FEPB, PFA, SA COPPER 250 C (482 F) 150 C (302 F) Types PFAH, TFE NICKEL, OR NICKEL-COATED COPPER Type Z ALUMINUM OR COPPER-CLAD ALUMINUM 2/ /0 3/ /0 4/ /0 Size AWG or kcmil *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 40 C (104 F). Table (B)(20) (formerly Table ) Ampacities of Not More Than Three Single Insulated Conductors, Rated Up to and Including 2000 Volts, Supported on a Messenger, Based on Ambient Air Temperature of 40 C (104 F)* Size AWG or kcmil Temperature Rating of Conductor [See Table (A).] 75 C (167 F) 90 C (194 F) Types RHW, THHW, THW, THWN, XHHW, ZW Types MI, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHHW, XHHW-2, ZW-2 COPPER 75 C (167 F) Types RHW, THW, THWN, THHW, XHHW 90 C (194 F) Types THHN, THHW, RHH, XHHW, RHW-2, XHHW-2, THW-2, THWN-2, USE-2, ZW-2 ALUMINUM OR COPPER-CLAD ALUMINUM / /0 2/ /0 3/ /0 4/ / Page 28 of 101 Size AWG or kcmil

30 7 of 98 4/15/ :10 PM Size AWG or kcmil Temperature Rating of Conductor [See Table (A).] 75 C (167 F) 90 C (194 F) Types RHW, THHW, THW, THWN, XHHW, ZW Types MI, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHHW, XHHW-2, ZW-2 COPPER 75 C (167 F) Types RHW, THW, THWN, THHW, XHHW 90 C (194 F) Types THHN, THHW, RHH, XHHW, RHW-2, XHHW-2, THW-2, THWN-2, USE-2, ZW-2 ALUMINUM OR COPPER-CLAD ALUMINUM Size AWG or kcmil *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 40 C (104 F). Refer to (B)(3)(a) for more than three current-carrying conductors. Table (B)(21) (formerly Table ) Ampacities of Bare or Covered Conductors in Free Air, Based on 40 C (104 F) Ambient, 80 C (176 F) Total Conductor Temperature, 610 mm/sec (2 ft/sec) Wind Velocity AWG or kcmil Copper Conductors AAC Aluminum Conductors Bare Covered Bare Covered Amperes AWG or kcmil Amperes AWG or kcmil Amperes AWG or kcmil / / / / / / / / / / / / / / / / Amperes Page 29 of 101

31 8 of 98 4/15/ :10 PM AWG or kcmil Copper Conductors AAC Aluminum Conductors Bare Covered Bare Covered Amperes AWG or kcmil Amperes AWG or kcmil Amperes AWG or kcmil Submitter Information Verification Amperes Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 14:47:23 EST 2015 Committee Statement Committee Statement: Adding a reference to (B)(3)(a) in the note increases usability. The other notes suggested by this public input create too much duplication of code text. Type USE is acceptable for use at ampacities corresponding to the 75C columns. Response Message: Public Input No. 609-NFPA [Section No (C)] Public Input No NFPA [Section No (C)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Page 30 of 101

32 9 of 98 4/15/ :10 PM Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 31 of 101

33 0 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (B) [Excluding any Sub-Sections] ] Ampacities for conductors rated 2001 to 35,000 volts shall be as specified in Table (C)(67) through Table (C)(86). Ampacities for ambient temperatures other than those specified in the ampacity tables shall be corrected in accordance with (C) (4)310.60(C)(4) (B)(4). Informational Note No. 1: For ampacities calculated in accordance with (A), reference IEEE (IPCEA Pub. No. P ), Standard Power Cable Ampacity Tables, and the references therein for availability of all factors and constants. Informational Note No. 2: Ampacities provided by this section do not take voltage drop into consideration. See (A), Informational Note No. 4, for branch circuits and 215.2(A), Informational Note No. 2, for feeders. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 15:00:20 EST 2015 Committee Statement Committee Statement: Response Message: All reference to the IPCEA publication has been omitted due to the publication being no longer available. Public Input No NFPA [Section No (B) [Excluding any Sub-Sections]] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Page 32 of 101

34 1 of 98 4/15/ :10 PM Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 33 of 101

35 2 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (B)(2) ] (2) Burial Depth of Underground Circuits. Where the burial depth of direct burial or electrical duct bank circuits is modified from the values shown in a figure or table, ampacities shall be permitted to be modified as indicated in (C) (B) (2)(a) and (C) (B) (2)(b). (a) (b) Where burial depths are increased in part(s) of an electrical duct run, no a decrease in ampacity of the conductors is needed shall not be required, provided the total length of parts of the duct run increased in depth is less than 25 percent of the total run length. Where burial depths are deeper than shown in a specific underground ampacity table or figure, an ampacity derating factor of 6 percent per 300-mm 300 mm (1-ft 1 ft ) increase in depth for all values of rho shall be permitted. No rating change is needed ampacity adjustments shall be required where the burial depth is decreased. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 15:04:33 EST 2015 Committee Statement Committee Statement: Response Message: These proposed changes should be viewed as editorial revisions, seeking to create an enforceable statement. Public Input No NFPA [Section No (B)(2)] Public Input No NFPA [Section No (B)(2)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Page 34 of 101

36 3 of 98 4/15/ :10 PM Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 35 of 101

37 4 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (C) ] (B) Engineering Supervision. Under engineering supervision, conductor ampacities shall be permitted to be calculated by using the following general equation: [310.60(B)] where: Tc = = conductor temperature ( C) Ta = = ambient temperature ( C) Td = = dielectric loss temperature rise Rdc = = dc resistance of conductor at temperature Tc Yc = = component ac resistance resulting from skin effect and proximity effect Rca = = effective thermal resistance between conductor and surrounding ambient Informational Note: The dielectric loss temperature rise ( Td) is negligible for single circuit extruded dielectric cables rated below 46 kv. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Jan 20 14:13:32 EST 2015 Committee Statement Committee Statement: In order to comply with NEC style manual and to correlate with references in Section , the panel changes the designation for section " (B)Tables" to "(C) Tables" and "(C) Engineering Supervision" to "(B) Engineering Supervision". Response Message: Public Input No NFPA [Section No (B)(2)] Public Input No NFPA [Section No (B)(4)] Public Input No NFPA [Global Input] Public Input No NFPA [Section No (C)] Ballot Results This item has passed ballot Page 36 of 101

38 5 of 98 4/15/ :10 PM 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 37 of 101

39 6 of 98 4/15/ :10 PM First Revision No NFPA [ Section No ] Page 38 of 101

40 7 of 98 4/15/ :10 PM Conductor Constructions and Applications. Page 39 of 101

41 8 of 98 4/15/ :10 PM Insulated conductors shall comply with the applicable provisions of Table (A) through Table (E). Informational Note: Thermoplastic insulation may stiffen at temperatures lower than -10 C (+14 F). Thermoplastic insulation may also be deformed at normal temperatures where subjected to pressure, such as at points of support. Table (A) Conductor Applications and Insulations Rated 600 Volts 1 Trade Name Fluorinated ethylene propylene Mineral insulation (metal sheathed) Moisture-, heat-, and oil-resistant thermoplastic Paper Type Letter FEP or FEPB MI MTW Maximum Operating Temperature 90 C ( 194 F) 200 C ( 392 F) 90 C ( 194 F) 250 C ( 482 F) 60 C ( 140 F) 90 C ( 194 F) 85 C ( 185 F) Application Provisions Dry and damp locations Insulation Fluorinated ethylene propylene Dry locations Fluorinated special ethylene applications 3 propylene Dry and wet locations For special applications 3 Machine tool wiring in wet locations Machine tool wiring in dry locations. Informational Note: See NFPA 79. For underground service conductors, or by special permission Magnesium oxide Flameretardant, moisture-, heat-, and oil-resistant thermoplastic Paper Thickness of Insulation AWG or kcmil mm mils Outer Covering 2 None Glass braid / (A) (B) (A) (B) Glass or other suitable braid material Copper or alloy steel (A) None (B) Nylon jacket or equivalent Lead sheath Page 40 of 101

42 9 of 98 4/15/ :10 PM Trade Name Type Letter Maximum Operating Temperature Application Provisions Insulation Thickness of Insulation AWG or kcmil mm mils Outer Covering 2 PFA 90 C ( 194 F) 200 C ( 392 F) Dry and damp locations Dry locations special applications 3 Perfluoroalkoxy Perfluoroalkoxy / None Perfluoroalkoxy PFAH 250 C ( 482 F) Dry locations only. Only for leads within apparatus or within raceways Perfluoroalkoxy connected to apparatus (nickel or nickelcoated copper only) / None Thermoset RHH 90 C ( 194 F) Dry and damp locations / Moistureresistant, flameretardant, nonmetallic covering 2 thermoset RHW RHW-2 75 C ( 167 F) 90 C ( 194 F) Dry and wet locations Moistureresistant Flameretardant, moistureresistant thermoset / Moistureresistant, flameretardant, nonmetallic covering Silicone SA 90 C ( 194 F) 200 C ( 392 F) Dry and damp locations For special application 3 Silicone rubber / Glass or other suitable braid material Thermoset SIS 90 C ( 194 F) Switchboard and switchgear wiring only Flameretardant thermoset / None Thermoplastic and fibrous outer braid TBS 90 C ( 194 F) Switchboard and switchgear Thermoplastic / Flameretardant, nonmetallic Page 41 of 101

43 0 of 98 4/15/ :10 PM Trade Name Extended polytetra- fluoro- ethylene Type Letter TFE Maximum Operating Temperature 250 C ( 482 F) Heat-resistant thermoplastic THHN 90 C ( 194 F) Moisture- and heat-resistant thermoplastic Moisture- and heat-resistant thermoplastic THHW THW 75 C ( 167 F) 90 C ( 194 F) 75 C ( 167 F) 90 C ( 194 F) Application Provisions Insulation Thickness of Insulation AWG or kcmil mm mils Outer Covering 2 wiring only 2.03 covering Dry and damp locations Dry locations only. Only for leads within apparatus or within raceways Extruded connected to polytetrafluoroethylene apparatus, or as open wiring (nickel or nickelcoated copper only) Flameretardant, heat-resistant thermoplastic Wet location Flameretardant, moisture- and heat-resistant Dry location thermoplastic Dry and wet locations Special applications within electric discharge lighting equipment. Limited to 1000 open-circuit volts or less. (size 14-8 only as permitted in ) Flameretardant, moisture- and heat-resistant thermoplastic / / / / None Nylon jacket or equivalent None None Page 42 of 101

44 1 of 98 4/15/ :10 PM Trade Name Moisture- and heat-resistant thermoplastic thermoplastic Underground feeder and branch-circuit cable single conductor (for Type UF cable employing more than one conductor, see Article 340.) Type Letter THW-2 THWN THWN-2 TW UF Underground serviceentrance cable single conductor (for Type USE USE cable employing more than one conductor, see Article 338.) USE-2 Maximum Operating Temperature 90 C ( 194 F) 75 C ( 167 F) 90 C ( 194 F) 60 C ( 140 F) 60 C ( 140 F) Application Provisions Dry and wet locations Dry and wet locations Dry and wet locations See Article 340. Insulation Flameretardant, moisture- and heat-resistant thermoplastic Moistureresistant Flameretardant, moistureresistant thermoplastic Moistureresistant 75 C Moisture- and ( 167 F) 5 heat-resistant 90 C ( 194 F) Dry and wet locations Page 43 of 101 Thickness of Insulation AWG or kcmil / / / / mm mils Outer Covering 2 Nylon jacket or equivalent None Integral with insulation 75 C ( 167 F) 5 See Article 338. Heat- and moistureresistant Moistureresistant nonmetallic covering (See )

45 2 of 98 4/15/ :10 PM Trade Name Type Letter Maximum Operating Temperature Application Provisions Insulation Thickness of Insulation AWG or kcmil mm mils Outer Covering 2 Thermoset XHH 90 C ( 194 F) Dry and damp locations Flameretardant thermoset / None Thermoset XHHN 90 C (194 F) Dry and damp locations Flameretardant thermoset / Nylon jacket or equivalent thermoset XHHW 90 C ( 194 F) 75 C ( 167 F) Dry and damp locations Wet locations Moistureresistant Flameretardant, moistureresistant thermoset / None thermoset XHHW-2 90 C ( 194 F) Dry and wet locations Moistureresistant Flameretardant, moistureresistant thermoset / None thermoset XHWN XHWN-2 75 C (167 F) 90 C (194 F) Dry and wet locations Moistureresistant Flameretardant, moistureresistant thermoset / Nylon jacket or equivalent Modified ethylene tetrafluoroethylene Z 90 C ( 194 F) 150 C ( 302 F) Dry and damp locations Dry locations special applications 3 Modified ethylene tetrafluoroethylene /0 4/ None Modified ethylene tetrafluoroethylene ZW 75 C ( 167 F) 90 C ( 194 F) 150 C Wet locations Dry and damp Modified ethylene tetrafluoroethylene None Page 44 of 101

46 3 of 98 4/15/ :10 PM Trade Name Type Letter Maximum Operating Temperature Application Provisions Insulation Thickness of Insulation AWG or kcmil mm mils Outer Covering 2 locations ZW-2 ( 302 F) 90 C ( 194 F) Dry locations special applications 3 Dry and wet locations 1 Conductors can be rated up to 1000 V if listed and marked. 2 Some insulations do not require an outer covering. 3 Where design conditions require maximum conductor operating temperatures above 90 C (194 F). 4 For signaling circuits permitting 300-volt insulation. 5 For ampacity limitation, see Includes integral jacket. 7 Insulation thickness shall be permitted to be 2.03 mm (80 mils) for listed Type USE conductors that have been subjected to special investigations. The nonmetallic covering over individual rubber-covered conductors of aluminum-sheathed cable and of lead-sheathed or multiconductor cable shall not be required to be flame retardant. For Type MC cable, see For nonmetallic-sheathed cable, see Article 334, Part III. For Type UF cable, see Article 340, Part III. Table (B) Thickness of Insulation for Nonshielded Types RHH and RHW Solid Dielectric Insulated Conductors Rated 2000 Volts Conductor Size (AWG or kcmil) Column A 1 Column B 2 mm mils mm mils / /0 4/ Column A insulations are limited to natural, SBR, and butyl rubbers. 2 Column B insulations are materials such as cross-linked polyethylene, ethylene propylene rubber, and composites thereof. Table (C) Conductor Application and Insulation Rated 2001 Volts and Higher Page 45 of 101

47 4 of 98 4/15/ :10 PM Trade Name Type Letter Maximum Operating Temperature Application Provision Insulation Outer Covering Medium voltage solid dielectric MV-90 MV-105* 90 C 105 C Dry or wet locations Thermoplastic or thermosetting Jacket, sheath, or armor *Where design conditions require maximum conductor temperatures above 90 C. Table (D) Thickness of Insulation and Jacket for Nonshielded Solid Dielectric Insulated Conductors Rated 2001 to 5000 Volts Conductor Size (AWG or kcmil) Dry Locations, Single Conductor Without Jacket Insulation With Jacket Wet or Dry Locations Single Conductor Insulation Jacket Insulation Jacket Multiconductor Insulation* mm mils mm mils mm mils mm mils mm mils mm mils / /0 4/ *Under a common overall covering such as a jacket, sheath, or armor. Table (E) Thickness of Insulation for Shielded Solid Dielectric Insulated Conductors Rated 2001 to 35,000 Volts Volts Volts ,000 Volts Conductor Size (AWG or kcmil) 100 Percent Insulation Level Percent Insulation Level Percent Insulation Level Percent Insulation Level Percent Insulation Level Percent Insulation Level Percent Insulation Level 3 mm mils mm mils mm mils mm mils mm mils mm mils mm mils mm / Pe Ins L Page 46 of 101

48 5 of 98 4/15/ :10 PM Conductor Size (AWG or kcmil) 100 Percent Insulation Level 1 25,001 28,000 volts 28,001 35,000 volts 133 Percent Insulation Level Percent Insulation Level Percent Insulation Level Percent Insulation Level Percent Insulation Level 3 mm mils mm mils mm mils mm mils mm mils mm mils / Percent Insulation Level. Cables in this category shall be permitted to be applied where the system is provided with relay protection such that ground faults will be cleared as rapidly as possible but, in any case, within 1 minute. While these cables are applicable to the great majority of cable installations that are on grounded systems, they shall be permitted to be used also on other systems for which the application of cables is acceptable, provided the above clearing requirements are met in completely de-energizing the faulted section Percent Insulation Level. This insulation level corresponds to that formerly designated for ungrounded systems. Cables in this category shall be permitted to be applied in situations where the clearing time requirements of the 100 percent level category cannot be met and yet there is adequate assurance that the faulted section will be de-energized in a time not exceeding 1 hour. Also, they shall be permitted to be used in 100 percent insulation level applications where additional insulation is desirable Percent Insulation Level. Cables in this category shall be permitted to be applied under all of the following conditions: (1) In industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons service the installation (2) Where the fault clearing time requirements of the 133 percent level category cannot be met (3) Where an orderly shutdown is essential to protect equipment and personnel (4) There is adequate assurance that the faulted section will be de-energized in an orderly shutdown Also, cables with this insulation thickness shall be permitted to be used in 100 or 133 percent insulation level applications where additional insulation strength is desirable. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Jan 20 11:31:02 EST 2015 Committee Statement Committee Revision to Table (A) to include Thermoset XHHN and moisture-resistant Page 47 of 101

49 6 of 98 4/15/ :10 PM Statement: Response Message: Thermoset XHWN and XHWN-2. Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 48 of 101

50 7 of 98 4/15/ :10 PM First Revision No NFPA [ Section No ] Scope. This article covers general requirements, applications, and construction specifications for flexible cords and flexible cables. Informational Note: UL 817, Cord Sets and Power-Supply Cords allows the use of flexible cords manufactured in accordance with UL 62, Flexible Cords and Cables. Cord sets and power-supply cords are restricted in use by the requirements in Article 400. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 17:06:03 EST 2015 Committee Statement Committee Statement: Response Message: This Informational Note will help make it clear that Cord Sets and Power-Supply Cords are restricted in use by Article 400. Public Input No NFPA [Section No ] Public Input No NFPA [Section No ] Public Input No NFPA [Section No ] Public Input No NFPA [Article 400] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Page 49 of 101

51 8 of 98 4/15/ :10 PM Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 50 of 101

52 9 of 98 4/15/ :10 PM First Revision No NFPA [ Section No ] Page 51 of 101

53 0 of 98 4/15/ :10 PM Types. Page 52 of 101

54 1 of 98 4/15/ :10 PM Flexible cords and flexible cables shall conform to the description in Table The use of flexible cords and flexible cables other than those in Table shall require permission by the authority having jurisdiction. Table Flexible Cords and Cables (See ) Nominal Insulation Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Thickness or kcmil mm mils Braid on Each Conduc tor Lamp cord C or more Thermoset or thermoplastic Cotton Elevator cable 300 E 1, 2,3,4 or or more Thermoset Cotton Flexible nylon jacket Elevator cable EO 1,2,4 300 or or more Thermoset Cotton Elevator cable ETP 2,4 300 or 600 Rayon ETT 2,4 300 or 600 None Electric vehicle cable EV 5, or more plus grounding conductor(s), plus optional hybrid data, Thermoset with optional nylon (0.51) 1.14 (0.76) 30 (20) 45 (30) Optional Page 53 of 101

55 2 of 98 4/15/ :10 PM Nominal Insulation Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Thickness or kcmil mm mils Braid on Each Conduc tor signal communications, and optical fiber cables /0 EVJ 5, EVE 5, or more plus grounding conductor(s), Thermoplastic plus optional elastomer hybrid data, with optional signal nylon communications, and optical fiber cables 1.52 (1.14) 2.03 (1.52) (1.90) /0 EVJE 5, EVT 5, or more plus grounding conductor(s), plus optional Thermoplastic hybrid data, with optional signal nylon communications, and optical fiber cables 0.76 (0.51) ] 0.76 (0.51) 1.14 (0.76) 1.52 (1.14) 2.03 (1.52) (1.90) /0 EVJT 5, (0.51) 0.76 (0.51) 1.14 (0.76) 1.52 (1.14) 2.03 (1.52) (1.90) 0.76 (0.51) 60 (45) 80 (60) 95 (75) 30 (20) 30 (20) 45 (30) 60 (45) 80 (60) 95 (75) 30 (20) 30 (20) 45 (30) 60 (45) 80 (60) 95 (75) 30 (20) Optional Portable power cable G plus grounding conductor(s) Thermoset / Page 54 of 101

56 3 of 98 4/15/ :10 PM Heater cord Trade Name Parallel heater cord Thermoset jacketed heater cords Type Letter Voltage AWG or kcmil G-GC Number of Conductors 3 6 plus grounding conductors and 1 ground check conductor Insulation Thermoset HPD , 3, or 4 Thermoset HPN or 3 Oil-resistant thermoset HSJ , 3, or 4 Thermoset AWG Nominal Insulation Thickness or kcmil mm mils / Braid on Each Conduc tor None None None HSJO HSJOW HSJOO Oil-resistant thermoset HSJOOW NISP Thermoset NISP Non-integral parallel cords Twisted portable cord NISPE Thermoplastic 2 or 3 elastomer NISPE NISPT Thermoplastic NISPT PD or more Thermoset or thermoplastic None Cotton Page 55 of 101

57 4 of 98 4/15/ :10 PM Nominal Insulation Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Thickness or kcmil mm mils Braid on Each Conduc tor Portable power cable PPE plus optional grounding conductor(s) Thermoplastic elastomer / Hard service cord S or more Thermoset None Flexible stage and lighting power cable SC 7, or more Thermoset / SCE 7, Thermoplastic elastomer SCT 7, Thermoplastic Hard service cord SE or more Thermoplastic elastomer None SEW 7, SEO SEOW 7,9 600 SEOO SEOOW 7,9 600 Oil-resistant thermoplastic elastomer Junior hard service cord SJ Thermoset None Page 56 of 101

58 5 of 98 4/15/ :10 PM Nominal Insulation Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Thickness or kcmil mm mils Braid on Each Conduc tor SJE 300 Thermoplastic elastomer SJEW SJEO 300 SJEOW SJEOO 300 Oil-resistant thermoplastic elastomer SJEOOW SJO 300 Thermoset SJOW SJOO 300 Oil-resistant thermoset SJOOW SJT 300 Thermoplastic SJTW SJTO Page 57 of 101

59 6 of 98 4/15/ :10 PM Nominal Insulation Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Thickness or kcmil mm mils Braid on Each Conduc tor SJTOW SJTOO 300 Oil-resistant thermoplastic SJTOOW Hard service cord SO or more Thermoset None SOW 7,9 600 SOO Oilresistant thermoset SOOW 7,9 600 All thermoset parallel cord SP or 3 Thermoset None SP SP , All elastomer (thermoplastic) parallel cord SPE or 3 Thermoplastic elastomer None SPE SPE Page 58 of

60 7 of 98 4/15/ :10 PM Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Nominal Insulation Thickness or kcmil mm mils All thermoplastic SPT or 3 Thermoplastic None parallel cord Braid on Each Conduc tor SPT-1W SPT or SPT-2W SPT or Range, dryer cable SRD or 4 Thermoset None SRDE or 4 Thermoplastic elastomer None SRDT or 4 Thermoplastic None Hard service cord ST or more Thermoplastic None STW 7,9 600 STO STOW 7, STOO Oil-resistant thermoplastic Page 59 of 101

61 8 of 98 4/15/ :10 PM Nominal Insulation Trade Name Type Letter Voltage AWG or kcmil Number of Conductors Insulation AWG Thickness or kcmil mm mils Braid on Each Conduc tor STOOW Vacuum cleaner cord SV or 3 Thermoset None SVE 300 Thermoplastic elastomer SVEO 300 SVEOO 300 Oil-resistant thermoplastic elastomer SVO 300 Thermoset SVOO 300 Oil-resistant thermoset SVT 300 Thermoplastic SVTO 300 Thermoplastic Parallel tinsel cord Jacketed tinsel cord SVTOO 300 Oil-resistant thermoplastic TPT Thermoplastic None TST Thermoplastic None Portable power cable W Thermoset / Notes: All types listed in Table shall have individual conductors twisted together, except for Types HPN, SP-1, SP-2, SP-3, SPE-1, SPE-2, SPE-3, SPT-1, SPT-2, SPT-3, SPT-1W, Page 60 of 101

62 9 of 98 4/15/ :10 PM SPT-2W, TPT, NISP-1, NISP-2, NISPT-1, NISPT-2, NISPE-1, NISPE-2, and three-conductor parallel versions of SRD, SRDE, and SRDT. The individual conductors of all cords, except those of heat-resistant cords, shall have a thermoset or thermoplastic insulation, except that the equipment grounding conductor, where used, shall be in accordance with (B). 1 Rubber-filled or varnished cambric tapes shall be permitted as a substitute for the inner braids. 2 Elevator traveling cables for operating control and signal circuits shall contain nonmetallic fillers as necessary to maintain concentricity. Cables shall have steel supporting members as required for suspension by In locations subject to excessive moisture or corrosive vapors or gases, supporting members of other materials shall be permitted. Where steel supporting members are used, they shall run straight through the center of the cable assembly and shall not be cabled with the copper strands of any conductor. In addition to conductors used for control and signaling circuits, Types E, EO, ETP, and ETT elevator cables shall be permitted to incorporate in the construction one or more 20 AWG telephone conductor pairs, one or more coaxial cables, or one or more optical fibers. The 20 AWG conductor pairs shall be permitted to be covered with suitable shielding for telephone, audio, or higher frequency communications circuits; the coaxial cables shall consist of a center conductor, insulation, and a shield for use in video or other radio frequency communications circuits. The optical fiber shall be suitably covered with flame-retardant thermoplastic. The insulation of the conductors shall be rubber or thermoplastic of a thickness not less than specified for the other conductors of the particular type of cable. Metallic shields shall have their own protective covering. Where used, these components shall be permitted to be incorporated in any layer of the cable assembly but shall not run straight through the center. 3 Insulations and outer coverings that meet the requirements as flame retardant, limited smoke, and are so listed, shall be permitted to be marked for limited smoke after the Code type designation. 4 Elevator cables in sizes 20 AWG through 14 AWG are rated 300 volts, and sizes 10 AWG through 2 AWG are rated 600 volts. 12 AWG is rated 300 volts with a 0.76 mm (30 mil) insulation thickness and 600 volts with a 1.14 mm (45 mil) insulation thickness. 5 Conductor size for Types EV, EVJ, EVE, EVJE, EVT, and EVJT cables apply to nonpowerlimited circuits only. Conductors of power-limited (data, signal, or communications) circuits may extend beyond the stated AWG size range. All conductors shall be insulated for the same cable voltage rating. 6 Insulation thickness for Types EV, EVJ, EVEJE, EVT, and EVJT cables of nylon construction is indicated in parentheses. 7 Types G, G-GC, S, SC, SCE, SCT, SE, SEO, SEOO, SEW, SEOW, SEOOW, SO, SOO, SOW, SOOW, ST, STO, STOO, STW, STOW, STOOW, PPE, and W shall be permitted for use on theater stages, in garages, and elsewhere where flexible cords are permitted by this Code. 8 The third conductor in Type HPN shall be used as an equipment grounding conductor only. The insulation of the equipment grounding conductor for Types SPE-1, SPE-2, SPE-3, SPT-1, SPT-2, SPT-3, NISPT-1, NISPT-2, NISPE-1, and NISPE-2 shall be permitted to be thermoset polymer. 9 Cords that comply with the requirements for outdoor cords and are so listed shall be permitted to be designated as weather and water resistant with the suffix W after the Code type designation. Cords with the W suffix are suitable for use in wet locations and are sunlight resistant. Page 61 of 101

63 0 of 98 4/15/ :10 PM 10 The required outer covering on some single-conductor cables may be integral with the insulation. 11 Types TPT and TST shall be permitted in lengths not exceeding 2.5 m (8 ft) where attached directly, or by means of a special type of plug, to a portable appliance rated at 50 watts or less and of such nature that extreme flexibility of the cord is essential. Supplemental Information File Name Panel_6_FR_1509_CJF.docx Description Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 16:44:58 EST 2015 Committee Statement Committee Statement: There are two lines in the thickness column for each AWG size range, one for a single layer of insulation and one for a layer of insulation that also contains a nylon covering. The AWG sizes need to be aligned with the appropriate rows, so are shifted down. Response Message: Public Input No NFPA [Section No ] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Page 62 of 101

64 1 of 98 4/15/ :10 PM Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 63 of 101

65 Excerpt from Table Trade Name Electric Vehicle Cable Type Letter Voltage AWG or kcmil Number of Conductors EV 5, or more plus grounding conductor(s), plus optional hybrid data, signal communications and optical fiber cables Insulation Thermoset with optional nylon AWG or kcmil / Nominal Insulation Thickness mm mils 0.76 (0.51) 1.14 (0.76) 1.52 (1.14) 2.03 (1.52) 2.41 (1.90) EVJ 5, (0.51) EVE 5, or more plus Thermoplastic grounding elastomer (0.51) conductor(s), with optional plus optional nylon (0.76) hybrid data, signal (1.14) communications, 1 4/ and optical fiber (1.52) cables (1.90) EVJE 5, (0.51) EVT 5, or more plus grounding conductor(s), plus optional hybrid data, signal communications, and optical fiber cables Thermoplastic elastomer with optional nylon / (0.51) 1.14 (0.76) 1.52 (1.14) 2.03 (1.52) 2.41 (1.90) EVJT 5, (0.51) 30 (20) 45 (30) 60 (45) 80 (60) 95 (75) 30 (20) 30 (20) 45 (30) 60 (45) 80 (60) 95 (75) 30 (20) 30 (20) 45 (30) 60 (45) 80 (60) 95 (75) 30 (20) Braid on each Conductor Optional Optional Outer Covering Oil-resistant thermoset Oil-resistant thermoplastic Oil-resistant thermoplastic Electrical vehicle charging Electrical vehicle charging Use Wet locations Wet locations Extra-hard usage Hard usage Extra-hard usage Hard usage Extra-hard usage Hard usage Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Formatted: Underline, Font color: Red Page 64 of 101

66 2 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (A) ] Page 65 of 101

67 3 of 98 4/15/ :10 PM (A) Ampacity Tables. Page 66 of 101

68 4 of 98 4/15/ :10 PM Table 400.5(A)(1) provides the allowable ampacities, and Table 400.5(A)(2) provides the ampacities for flexible cords and cables with not more than three current-carrying conductors. These tables shall be used in conjunction with applicable end-use product standards to ensure selection of the proper size and type. Where cords and cables are used in ambient temperatures other than 30 C (86 F), the temperature correction factors from Table (B) (2)(a) that correspond to the temperature rating of the cord or cable shall be applied to the ampacity in Table 400.5(A)(1) and Table 400.5(A)(2). Cords and cables rated 105 C shall use correction factors in the 90 C column of Table (B)(2)(a) for temperature correction. Where the number of current-carrying conductors exceeds three, the allowable ampacity or the ampacity of each conductor shall be reduced from the three-conductor rating as shown in Table 400.5(A)(3). Informational Note: See Informative Annex B, Table B (B)(2)(11), for adjustment factors for more than three current-carrying conductors in a raceway or cable with load diversity. Table 400.5(A)(1) Allowable Ampacity for Flexible Cords and Cables [Based on Ambient Temperature of 30 C (86 F). See and Table ] Copper Conductor Size (AWG) Thermoplastic Types TPT, TST Thermoset Types C, E, EO, PD, S, SJ, SJO, SJOW, SJOO, SJOOW, SO, SOW, SOO, SOOW, SP-1, SP-2, SP-3, SRD, SV, SVO, SVOO, NISP-1, NISP-2 Thermoplastic Types ETP, ETT, NISPE-1, NISPE-2, NISPT-1, NISPT-2, SE, SEW, SEO, SEOO, SEOW, SEOOW, SJE, SJEW, SJEO, SJEOO, SJEOW, SJEOOW, SJT, SJTW, SJTO, SJTOW, SJTOO, SJTOOW, SPE-1, SPE-2, SPE-3, SPT-1, SPT-1W, SPT-2, SPT-2W, SPT-3, ST, STW, SRDE, SRDT, STO, STOW, STOO, STOOW, SVE, SVEO, SVEOO, SVT, SVTO, SVTOO Column A a Column B b Types HPD, HPN, HSJ, HSJO, HSJOW, HSJOO, HSJOOW 27 c d e Page 67 of 101

69 5 of 98 4/15/ :10 PM Copper Conductor Size (AWG) Thermoplastic Types TPT, TST Thermoset Types C, E, EO, PD, S, SJ, SJO, SJOW, SJOO, SJOOW, SO, SOW, SOO, SOOW, SP-1, SP-2, SP-3, SRD, SV, SVO, SVOO, NISP-1, NISP-2 Thermoplastic Types ETP, ETT, NISPE-1, NISPE-2, NISPT-1, NISPT-2, SE, SEW, SEO, SEOO, SEOW, SEOOW, SJE, SJEW, SJEO, SJEOO, SJEOW, SJEOOW, SJT, SJTW, SJTO, SJTOW, SJTOO, SJTOOW, SPE-1, SPE-2, SPE-3, SPT-1, SPT-1W, SPT-2, SPT-2W, SPT-3, ST, STW, SRDE, SRDT, STO, STOW, STOO, STOOW, SVE, SVEO, SVEOO, SVT, SVTO, SVTOO Types HPD, HPN, HSJ, HSJO, HSJOW, HSJOO, HSJOOW a The allowable currents under Column A apply to three-conductor cords and other multiconductor cords connected to utilization equipment so that only three-conductors are current-carrying. b The allowable currents under Column B apply to two-conductor cords and other multiconductor cords connected to utilization equipment so that only two conductors are current-carrying. c Tinsel cord. d Elevator cables only. e 7 amperes for elevator cables only; 2 amperes for other types. Table 400.5(A)(2) Ampacity of Cable Types SC, SCE, SCT, PPE, G, G-GC, and W. [Based on Ambient Temperature of 30 C (86 F). See Table ] Copper Conductor Size (AWG or kcmil) Temperature Rating of Cable 60 C (140 F) 75 C (167 F) 90 C (194 F) D 1 E 2 F 3 D 1 E 2 F 3 D 1 E 2 F / / / / Page 68 of 101

70 6 of 98 4/15/ :10 PM Copper Conductor Size (AWG or kcmil) Temperature Rating of Cable 60 C (140 F) 75 C (167 F) 90 C (194 F) D 1 E 2 F 3 D 1 E 2 F 3 D 1 E 2 F The ampacities under subheading D shall be permitted for single-conductor Types SC, SCE, SCT, PPE, and W cable only where the individual conductors are not installed in raceways and are not in physical contact with each other except in lengths not to exceed 600 mm (24 in.) where passing through the wall of an enclosure. 2 The ampacities under subheading E apply to two-conductor cables and other multiconductor cables connected to utilization equipment so that only two conductors are current-carrying. 3 The ampacities under subheading F apply to three-conductor cables and other multiconductor cables connected to utilization equipment so that only three conductors are current-carrying. Table 400.5(A)(3) Adjustment Factors for More Than Three Current-Carrying Conductors in a Flexible Cord or Cable Number of Conductors and above 35 Percent of Value in Table 400.5(A)(1) and Table 400.5(A)(2) A neutral conductor that carries only the unbalanced current from other conductors of the same circuit shall not be required to meet the requirements of a current-carrying conductor. In a 3-wire circuit consisting of two phase conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system, a common conductor carries approximately the same current as the line-to-neutral currents of the other conductors and shall be considered to be a currentcarrying conductor. On a 4-wire, 3-phase, wye circuit where more than 50 percent of the load consists of nonlinear loads, there are harmonic currents present in the neutral conductor and the neutral conductor shall be considered to be a current-carrying conductor. An equipment grounding conductor shall not be considered a current-carrying conductor. Page 69 of 101

71 7 of 98 4/15/ :10 PM Where a single conductor is used for both equipment grounding and to carry unbalanced current from other conductors, as provided for in for electric ranges and electric clothes dryers, it shall not be considered as a current-carrying conductor. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Jan 20 13:04:26 EST 2015 Committee Statement Committee Statement: Response Message: Conductors in sizes 7, 5, and 3 AWG have been added to UL 62 for service cords. The ampacity of these cords is being added to Table 400.5(A)(1). Public Input No NFPA [Section No (A)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 70 of 101

72 8 of 98 4/15/ :10 PM First Revision No NFPA [ Section No ] Uses Not Permitted. Unless specifically permitted in , flexible cords and cables, flexible cord sets, and power supply cords shall not be used for the following: (1) As a substitute for the fixed wiring of a structure (2) Where run through holes in walls, structural ceilings, suspended ceilings, dropped ceilings, or floors (3) Where run through doorways, windows, or similar openings (4) Where attached to building surfaces Exception to (4): Flexible cord and cable shall be permitted to be attached to building surfaces in accordance with the provisions of (B). (5) Where concealed by walls, floors, or ceilings or located above suspended or dropped ceilings (6) Where installed in raceways, except as otherwise permitted in this Code (7) Where subject to physical damage Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Jan 20 08:50:00 EST 2015 Committee Statement Committee Statement: PI 4265 has not been included due to the proposed text allowing unlimited use above a suspended ceiling when not used as a plenum. PI 797 will make the NEC more user friendly by following an already established pattern that the.10 and.12 sections of an article is uses permitted and uses not permitted, respectively. PI 3854 has not been included due to the proposed text allowing unlimited use of 3 ft cords in spaces used for environmental air. The allowance of attaching to listed equipment would allow field installed cords attached to equipment. PI1508 provides clarity that cord sets and power-supply cords are required to meet the requirements of and (New and ) Page 71 of 101

73 9 of 98 4/15/ :10 PM Response Message: Public Input No. 797-NFPA [Section No ] Public Input No NFPA [Section No ] Public Input No NFPA [Section No ] Public Input No NFPA [Section No ] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 11 Affirmative All 0 Affirmative with Comments 1 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Negative with Comment Huddleston, Jr., Robert L. 1. It appears that PI797, which the Panel, in their statement, indicates agreement with, did not get incorporated into the FR. Section 10 and 12 were not revised to indicate "Uses Permitted" and "Uses Not Permitted". 2. Adding the words "power supply cords" does not add clarity, and these words basically disagree with the Article heading of "Flexible Cord and Cables". Adding anything to these words in Section does not add clarity to an already easily understood section. Page 72 of 101

74 0 of 98 4/15/ :10 PM First Revision No NFPA [ Section No (A) ] (A) Conductors. The individual conductors of a flexible cord or flexible cable shall have copper flexible stranding and shall not be smaller than the sizes specified in Table Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 19 16:21:15 EST 2015 Committee Statement Committee Statement: The Public Input was made without any supporting documentation or regard for voltage ratings presently established for cord products. Note that ampacities in the article and construction details in standards covering flexible cords only pertain to copper conductors. In order to emphasize that flexible cords and flexible cable rated 600 volts and below should use copper conductors, The word copper was added to (A). Response Message: Public Input No NFPA [Section No ] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 10 Affirmative All 1 Affirmative with Comments 1 Negative with Comments 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Kent, Gerald W. Page 73 of 101

75 1 of 98 4/15/ :10 PM Laidler, William F. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Affirmative with Comment Picard, Paul R. The Aluminum Association supports the use of aluminum for wire and cable. However, the product standards restrict flexible cords and cables to copper; therefore we will not vote against this change. Negative with Comment Huddleston, Jr., Robert L. This word "copper" is not needed, as NEC Section already says that unless otherwise stated in the Code, conductors are copper. Adding additional un-needed words to the Code does not addd clarity or usability. Page 74 of 101

76 2 of 98 4/15/ :10 PM First Revision No NFPA [ Section No ] Page 75 of 101

77 3 of 98 4/15/ :10 PM Types. Page 76 of 101

78 4 of 98 4/15/ :10 PM Fixture wires shall be of a type listed in Table 402.3, and they shall comply with all requirements of that table. The fixture wires listed in Table are all suitable for service at 600 volts, nominal, unless otherwise specified. Informational Note: Thermoplastic insulation may stiffen at temperatures colder lower than 10 C (+14 F 14 F ), requiring that care be exercised during installation at such temperatures. Thermoplastic insulation may also be deformed at normal temperatures where subjected to pressure, requiring that care be exercised during installation and such as at points of support. Table Fixture Wires Name Type Letter Thickness of Insulation Insulation AWG mm mils Outer Covering Maximum Operating Temperature Application Provisions Heat-resistant rubbercovered fixture wire flexible stranding FFH-2 Heat-resistant rubber Cross-linked synthetic polymer Nonmetallic covering 75 C ( 167 F) Fixture wiring ECTFE solid or 7-strand HF Ethylene chlorotrifluoroethylene None 150 C ( 302 F) Fixture wiring ECTFE flexible stranding HFF Ethylene chlorotrifluoroethylene None 150 C ( 302 F) Fixture wiring Tape insulated fixture wire solid or 7-strand KF-1 KF-2 Aromatic polyimide tape Aromatic polyimide tape None None 200 C ( 392 F) 200 C ( 392 F) Fixture wiring limited to 300 volts Fixture wiring Tape insulated fixture wire flexible stranding KFF-1 KFF-2 Aromatic polyimide tape Aromatic polyimide tape None None 200 C ( 392 F) 200 C ( 392 F) Fixture wiring limited to 300 volts Fixture wiring solid or 7-strand (nickel or PAF None 250 C ( 482 F) Fixture wiring (nickel or Perfluoroalkoxy Perfluoroalkoxy nickelcoated Page 77 of 101

79 5 of 98 4/15/ :10 PM Name Type Letter Thickness of Insulation Insulation AWG mm mils Outer Covering Maximum Operating Temperature Application Provisions nickel-coated copper) copper) Perfluoroalkoxy flexible stranding PAFF Perfluoroalkoxy None 150 C ( 302 F) Fixture wiring Fluorinated ethylene propylene fixture wire solid or 7-strand PF Fluorinated ethylene propylene None 200 C ( 392 F) Fixture wiring Fluorinated ethylene propylene fixture wire flexible stranding PFF Fluorinated ethylene propylene None 150 C ( 302 F) Fixture wiring Fluorinated ethylene propylene fixture wire solid or 7-strand PGF Fluorinated ethylene propylene Glass braid 200 C ( 392 F) Fixture wiring Fluorinated ethylene propylene fixture wire flexible stranding PGFF Fluorinated ethylene propylene Glass braid 150 C ( 302 F) Fixture wiring Extruded polytetrafluoroethylene solid or 7-strand (nickel or nickel-coated copper) PTF None 250 C ( 482 F) Fixture wiring (nickel or Extruded polytetrafluoroethylene nickelcoated copper) Page 78 of 101

80 6 of 98 4/15/ :10 PM Name Extruded flexible stranding (AWG silver or polytetrafluoroethylene nickelcoated copper) Heat-resistant nickelcoated rubbercovered fixture wire solid or 7-strand Heat-resistant cross-linked synthetic metallic polymer-insulated fixture wire solid or 7-strand Silicone insulated fixture wire solid or 7-strand Silicone insulated fixture wire flexible stranding Type Letter PTFF RFH-1 RFH-2 Thickness of Insulation Insulation AWG mm mils Heat-resistant rubber Heat-resistant rubber Cross-linked synthetic polymer Cross-linked RFHH-2* synthetic polymer None Outer Covering Nonmetallic covering RFHH-3* SF-1 SF-2 SFF-1 SFF-2 Silicone rubber Silicone rubber Silicone rubber Silicone rubber None or non- covering None or nonmetallic covering Nonmetallic covering Nonmetallic covering Nonmetallic covering Page 79 of 101 Nonmetallic covering Maximum Operating Temperature 150 C ( 302 F) 75 C ( 167 F) Application Provisions Fixture wiring (silver or Extruded polytetrafluoroethylene copper) Fixture wiring limited to 300 volts 75 C ( 167 F) Fixture wiring 90 C ( 194 F) 200 C ( 392 F) 200 C ( 392 F) 150 C ( 302 F) 150 C ( 302 F) Fixture wiring Fixture wiring limited to 300 volts Fixture wiring Fixture wiring limited to 300 volts Fixture wiring

81 7 of 98 4/15/ :10 PM Name Thermoplastic covered fixture wire solid or 7-strand Thermoplastic covered fixture wire flexible stranding covered fixture wire solid or 7-strand covered fixture wire flexible stranded Cross-linked polyolefin insulated fixture wire solid or 7-strand Cross-linked polyolefin insulated fixture wire flexible stranded Modified ETFE solid or 7-strand Type Letter Thickness of Insulation Insulation AWG mm mils Outer Covering Maximum Operating Temperature Application Provisions TF* Thermoplastic None 60 C ( 140 F) Fixture wiring TFF* Thermoplastic None 60 C ( 140 F) Fixture wiring TFN* Thermoplastic TFFN* Thermoplastic XF* XFF* ZF Cross-linked polyolefin Cross-linked polyolefin Modified ethylene tetrafluoroethylene Heat-resistant thermoplastic Nylonjacket- ed or equivalent Heat-resistant thermoplastic Nylonjacket- ed or equivalent None Page 80 of C ( 194 F) Fixture wiring 90 C ( 194 F) Fixture wiring None 150 C ( 302 F) None 150 C ( 302 F) 150 C ( 302 F) Fixture wiring limited to 300 volts Fixture wiring limited to 300 volts Fixture wiring

82 8 of 98 4/15/ :10 PM Name Type Letter Thickness of Insulation Insulation AWG mm mils Outer Covering Maximum Operating Temperature Application Provisions Flexible stranding ZFF Modified ethylene tetrafluoroethylene None 150 C ( 302 F) Fixture wiring High temp. modified ETFE solid or 7-strand ZHF Modified ethylene tetrafluoroethylene None 200 C ( 392 F) Fixture wiring *Insulations and outer coverings that meet the requirements of flame retardant, limited smoke, and are so listed, shall be permitted to be marked for limited smoke after the Code type designation. Submitter Information Verification Submitter Full Name: CMP 6 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Jan 20 09:05:48 EST 2015 Committee Statement Committee Statement: Response Message: The National Electrical Code is not an installation manual and this will agree with the informational note to Public Input No NFPA [Section No ] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 12 Affirmative All 0 Affirmative with Comments 0 Negative with Comments Page 81 of 101

83 9 of 98 4/15/ :10 PM 0 Abstention Affirmative All Brush, Edwin F. Friedman, Samuel B. Huddleston, Jr., Robert L. Kent, Gerald W. Laidler, William F. Picard, Paul R. Riedl, Kenneth Smith, Michael W. Stacey, John Wall, Carl Timothy Xerri, Mario Zimnoch, Joseph S. Page 82 of 101

84 0 of 98 4/15/ :10 PM First Revision No NFPA [ Section No. B (B)(7) ] Page 83 of 101

85 1 of 98 4/15/ :10 PM (7) Examples Showing Use of Figure B (B)(2)(1) for Electrical Duct Bank Ampacity Modifications. Page 84 of 101

86 2 of 98 4/15/ :10 PM Figure B (B)(2)(1) is used for interpolation or extrapolation for values of Rho and load factor for cables installed in electrical ducts. The upper family of curves shows the variation in ampacity and Rho at unity load factor in terms of I1, the ampacity for Rho = 60, and 50 percent load factor. Each curve is designated for a particular ratio I2/I1, where I2 is the ampacity at Rho = 120 and 100 percent load factor. The lower family of curves shows the relationship between Rho and load factor that will give substantially the same ampacity as the indicated value of Rho at 100 percent load factor. As an example, to find the ampacity of a 500-kcmil copper cable circuit for six electrical ducts as shown in Table B (B)(2)(5): At the Rho = 60, LF = 50, I1 = 583; for Rho = 120 and LF = 100, I2 = 400. The ratio I2/I1 = Locate Rho = 90 at the bottom of the chart and follow the 90 Rho line to the intersection with 100 percent load factor where the equivalent Rho = 90. Then follow the 90 Rho line to I2/I1ratio of where F = The desired ampacity = = 431, which agrees with the table for Rho = 90, LF = 100. To determine the ampacity for the same circuit where Rho = 80 and LF = 75, using Figure B (B)(2)(1), the equivalent Rho = 43, F = 0.855, and the desired ampacity = = 498 amperes. Values for using Figure B (B)(2)(1) are found in the electrical duct bank ampacity tables of this informative annex. Where the load factor is less than 100 percent and can be verified by measurement or calculation, the ampacity of electrical duct bank installations can be modified as shown. Different values of Rho can be accommodated in the same manner. Table B (B)(2)(1) Ampacities of Two or Three Insulated Conductors, Rated 0 Through 2000 Volts, Within an Overall Covering (Multiconductor Cable), in Raceway in Free Air Based on Ambient Air Temperature of 30 C (86 F)* Size (AWG or kcmil) 60 C (140 F) Types TW, UF Temperature Rating of Conductor. [See Table (A).] 75 C (167 F) Types RHW, THHW, THW, THWN, XHHW, ZW COPPER 90 C (194 F) Types THHN, THHW, THW-2, THWN-2, RHH, RWH-2, USE-2, XHHW, XHHW-2, ZW-2 60 C (140 F) Type TW 75 C (167 F) Types RHW, THHW, THW, THWN, XHHW 90 C (194 F) Types THHN, THHW, THW-2, THWN-2, RHH, RWH-2,USE-2, XHHW, XHHW-2, ZW-2 ALUMINUM OR COPPER-CLAD ALUMINUM 14** 16** 18** 21** 14 12** 20** 24** 27** 16** 18** 21** 12 10** 27** 33** 36** 21** 25** 28** Size (AWG or kcmil) Page 85 of 101

87 3 of 98 4/15/ :10 PM / /0 2/ /0 3/ /0 4/ / *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 30 C (86 F). **Unless otherwise specifically permitted elsewhere in this Code, the overcurrent protection for these conductor types shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 AWG amperes for 10 AWG aluminum and copper-clad aluminum. Refer to 240.4(D) for conductor overcurrent protection limitations. Table B (B)(2)(3) Ampacities of Multiconductor Cables with Not More Than than Three Insulated Conductors, Rated 0 Through 2000 Volts, in Free Air Based on Ambient Air Temperature of 40 C (104 F) (for Types TC, MC, MI, UF, and USE Cables)* Size (AWG or kcmil) 60 C (140 F) Temperature Rating of Conductor. [See Table (A).] 75 C (167 F) COPPER 85 C (185 F) 90 C (194 F) 60 C (140 F) 75 C (167 F) 85 C (185 F) 90 C (194 F) ALUMINUM OR COPPER-CLAD ALUMINUM ** 18** 21** 24** 25** 14 12** 21** 28** 30** 32** 18** 21** 24** 25** 12 10** 28** 36** 41** 43** 21** 28** 30** 32** Page 86 of 101 Size (AWG or kcmil)

88 4 of 98 4/15/ :10 PM Size (AWG or kcmil) 60 C (140 F) Temperature Rating of Conductor. [See Table (A).] 75 C (167 F) 85 C (185 F) COPPER 90 C (194 F) 60 C (140 F) 75 C (167 F) 85 C (185 F) 90 C (194 F) ALUMINUM OR COPPER-CLAD ALUMINUM Size (AWG or kcmil) 1/ /0 2/ /0 3/ /0 4/ / *Refer to (B)(2) for the ampacity correction factors where the ambient temperature is other than 40 C (104 F). **Unless otherwise specifically permitted elsewhere in this Code, the overcurrent protection for these conductor types shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum. Refer to 240.4(D) for conductor overcurrent protection limitations. Table B (B)(2)(5) Ampacities of Single Insulated Conductors, Rated 0 through Through 2000 Volts, in Nonmagnetic Underground Electrical Ducts (One Conductor per Electrical Duct), Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure B (B)(2)(2), Conductor Temperature 75 C (167 F) Size (kcmil) 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE COPPER 9 Electrical Ducts (Fig. B (B) (2)(2), Detail 4) Types RHW, THHW, THW, THWN, XHHW, USE 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE 9 Electrical Ducts (Fig. B (B) (2)(2), Detail 4) Types RHW, THHW, THW, THWN, XHHW, USE ( ALUMINUM OR COPPER-CLAD ALUMINUM RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO Page 87 of 101

89 5 of 98 4/15/ :10 PM Size (kcmil) 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE COPPER 9 Electrical Ducts (Fig. B (B) (2)(2), Detail 4) Types RHW, THHW, THW, THWN, XHHW, USE 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE 9 Electrical Ducts (Fig. B (B) (2)(2), Detail 4) Types RHW, THHW, THW, THWN, XHHW, USE ( ALUMINUM OR COPPER-CLAD ALUMINUM LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF Ambient Temp. ( C) Correction Factors Table B (B)(2)(6) Ampacities of Three Insulated Conductors, Rated 0 through Through 2000 Volts, Within an Overall Covering (Three-Conductor Cable) in Underground Electrical Ducts (One Cable per Electrical Duct) Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure B (B)(2)(2), Conductor Temperature 75 C (167 F) A T Size (AWG or kcmil) 1 Electrical Duct (Fig. B (B) (2)(2), Detail 1) Types RHW, THHW, THW, THWN, XHHW, USE 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE 1 Electrical Duct (Fig. B (B) (2)(2), Detail 1) Types RHW, THHW, THW, THWN, XHHW, USE 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE Si (AW o kcm COPPER ALUMINUM OR COPPER-CLAD ALUMINUM RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO Page 88 of 101

90 6 of 98 4/15/ :10 PM Size (AWG or kcmil) 1 Electrical Duct (Fig. B (B) (2)(2), Detail 1) Types RHW, THHW, THW, THWN, XHHW, USE 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE COPPER 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE 1 Electrical Duct (Fig. B (B) (2)(2), Detail 1) Types RHW, THHW, THW, THWN, XHHW, USE 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) Types RHW, THHW, THW, THWN, XHHW, USE 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Types RHW, THHW, THW, THWN, XHHW, USE ALUMINUM OR COPPER-CLAD ALUMINUM LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF / / / / Ambient Temp. ( C) Correction Factors Table B (B)(2)(7) Ampacities of Three Single Insulated Conductors, Rated 0 Through 2000 Volts, in Underground Electrical Ducts (Three Conductors per Electrical Duct) Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure B (B)(2)(2), Conductor Temperature 75 C (167 F) Si (AW o kcm Am bie Tem ( 1 Electrical Duct (Fig. B (B) (2)(2), Detail 1) 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) 1 Electrical Duct (Fig. B (B) (2)(2), Detail 1) 3 Electrical Ducts (Fig. B (B) (2)(2), Detail 2) 6 Electrical Ducts (Fig. B (B) (2)(2), Detail 3) Page 89 of 101

91 Size (AWG or kcmil) Types RHW, THHW, THW, THWN, XHHW, USE Types RHW, THHW, THW, THWN, XHHW, USE COPPER Types RHW, THHW, THW, THWN, XHHW, USE Types RHW, THHW, THW, THWN, XHHW, USE Types RHW, THHW, THW, THWN, XHHW, USE Types RHW, THHW, THW, THWN, XHHW, USE ALUMINUM OR COPPER-CLAD ALUMINUM Si (AW o kcm RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO RHO LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF LF / / / / Ambient Temp. ( C) Correction Factors Am bie Tem ( Table B (B)(2)(8) Ampacities of Two or Three Insulated Conductors, Rated 0 Through 2000 Volts, Cabled Within an Overall (Two- or Three-Conductor) Covering, Directly Buried in Earth, Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure B (B)(2)(2), 100 Percent Load Factor, Thermal Resistance (Rho) of 90 Page 90 of of 98 4/15/ :10 PM

92 8 of 98 4/15/ :10 PM Size (AWG or kcmil) 1 Cable (Fig. B (B) (2)(2), Detail 5) 60 C (140 F) UF 75 C (167 F) RHW, THHW, THW, THWN, XHHW, USE TYPES 2 Cables (Fig. B (B) (2)(2), Detail 6) 60 C (140 F) UF COPPER 75 C (167 F) RHW, THHW, THW, THWN, XHHW, USE 1 Cable (Fig. B (B) (2)(2), Detail 5) 60 C (140 F) UF 75 C (167 F) RHW, THHW, THW, THWN, XHHW, USE TYPES 2 Cables (Fig. B (B) (2)(2), Detail 6) 60 C (140 F) UF 75 C (167 F) RHW, THHW, THW, THWN, XHHW, USE ALUMINUM OR COPPER-CLAD ALUMINUM Size (AWG or kcmil) 1/ /0 2/ /0 3/ /0 4/ / Ambient Temp.( C) Correction Factors Ambient Temp. ( F) Note: For ampacities of Type UF cable in underground electrical ducts, multiply the ampacities shown in the table by Table B (B)(2)(9) Ampacities of Three Triplexed Single Insulated Conductors, Rated 0 Through 2000 Volts, Directly Buried in Earth Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure B (B)(2)(2), 100 Percent Load Factor, Thermal Resistance (Rho) of 90 Size (AWG or See Fig. B (B) See Fig. B (B) See Fig. B (B) See Fig. B (B) Size (AWG or Page 91 of 101

93 9 of 98 4/15/ :10 PM kcmil) 60 C (140 F) (2)(2), Detail 7 75 C (167 F) TYPES 60 C (140 F) (2)(2), Detail 8 75 C (167 F) 60 C (140 F) (2)(2), Detail 7 75 C (167 F) TYPES 60 C (140 F) (2)(2), Detail 8 75 C (167 F) UF USE UF USE UF USE UF USE kcmil) COPPER ALUMINUM OR COPPER-CLAD ALUMINUM / /0 2/ /0 3/ /0 4/ / Ambient Temp.( C) Correction Factors Ambient Temp.( F) Table B (B)(2)(10) Ampacities of Three Single Insulated Conductors, Rated 0 Through 2000 Volts, Directly Buried in Earth Based on Ambient Earth Temperature of 20 C (68 F), Electrical Duct Arrangement in Accordance with Figure B (B)(2)(2), 100 Percent Load Factor, Thermal Resistance (Rho) of 90 Size (AWG or kcmil) See Fig. B (B) (2)(2), 60 C (140 F) Detail 9 75 C (167 F) See Fig. B (B) (2)(2), Detail C (140 F) 75 C (167 F) See Fig. B (B) (2)(2), 60 C (140 F) Detail 9 75 C (167 F) See Fig. B (B) (2)(2), Detail C (140 F) 75 C (167 F) Size (AWG or kcmil) TYPES TYPES UF USE UF USE UF USE UF USE Page 92 of 101

94 0 of 98 4/15/ :10 PM COPPER ALUMINUM OR COPPER-CLAD ALUMINUM / /0 2/ /0 3/ /0 4/ / Ambient Temp.( C) Correction Factors Ambient Temp.( F) Table B (B)(2)(11) Adjustment Factors for More Than Three Current-Carrying Conductors in a Raceway or Cable with Load Diversity Number of Conductors* Percent of Values in Tables as Adjusted for Ambient Temperature if Necessary ** ** ** *Number of conductors is the total number of conductors in the raceway or cable adjusted in accordance with (B)(4) and (5). **These factors include the effects of a load diversity of 50 percent. Informational Note: The ampacity limit for 10 through 85 current-carrying conductors is based on the following equation. For more than 85 conductors, special calculations are required that are beyond the scope of this table. Page 93 of 101

95 1 of 98 4/15/ :10 PM [B (B)(7)a] Example 1 where: A1 = = ampacity from Table (B)(16), Table (B)(18), Table B (B) (2)(1), Table B (B)(2)(6), or Table B (B)(2)(7) multiplied by the appropriate adjustment factor from Table B (B)(2)(11). N = = total number of conductors used to select adjustment factor from Table B (B)(2)(11) E = = number of conductors carrying current simultaneously in the raceway or cable A2 = = ampacity limit for the current-carrying conductors in the raceway or cable Calculate the ampacity limit for twelve 14 AWG THWN current-carrying conductors (75 C) in a raceway that contains 24 conductors that may, at different times, be current-carrying. [B (B)(7)b] Example 2 Calculate the ampacity limit for eighteen 14 AWG THWN current-carrying conductors (75 C) in a raceway that contains 24 conductors that may, at different times, be current-carrying. [B (B)(7)c] Figure B (B)(2)(1) Interpolation Chart for Cables in a Duct Bank. I1 = ampacity for Rho = 60, 50 LF; I2 = ampacity for Rho = 120, 100 LF (load factor); desired ampacity = F I1. Page 94 of 101

96 92 of 98 4/15/ :10 PM Figure B (B)(2)(2) Cable Installation Dimensions for Use with Table B (B) (2)(5) Through Table B (B)(2)(10). Informational Note Figure B (B)(2)(3) Ampacities of Single Insulated Conductors Rated 0 through Through 5000 Volts in Underground Electrical Ducts (Three Conductors per Electrical Duct), Nine Single-Conductor Cables per Phase Based on Ambient Earth Temperature of 20 C (68 F), Conductor Temperature 75 C (167 F). Page 95 of 101