1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): ZJCZStandard Number: UL 62Standard Title: Standard for Flexible Cords and CablesEdition Date: May 14, 2014Edition Number: 19Section / Paragraph Reference: 4.
3、1.1.8.2A (new), 4.1.1.8.3, 4.1.1.8.3A (new), Table XX(new)Subject: Grounding Conductor SizesDECISION:4.1.1.8.2 For flexible cord or cable with conductor sizes 5.26 mm2(10 AWG) and smaller, the groundingconductor shall be the same size or larger than the largest circuit conductors, except for Type DR
4、Tc,where a 3.31 mm2(12 AWG) grounding conductor may be used with 5.26 mm2(10 AWG) circuitconductors4.1.1.8.2A For flexible cord or cable with conductor sizes 6.63 mm2(9 AWG), the grounding conductorshall be 5.26 mm2(10 AWG).4.1.1.8.3 For flexible cord or cable with conductor sizes 8.37 33.6 mm2(8 2
5、AWG) and larger, thereduction of the grounding conductor by not more than two AWG sizes from the largest ungrounded circuitconductor shall be permitted (e.g., a cord having an 8.37 mm2(8 AWG) ungrounded circuit conductor mayhave a minimum 5.26 mm2(10 AWG) grounding conductor).4.1.1.8.3A For Electric
6、 vehicle cables with conductor sizes larger than 33.6 mm2(2 AWG), the groundingconductor shall not be smaller than indicated in Table XX and may be sectioned.Table XXCircuit conductor size, mm2(AWG) Minimum grounding conductor size, mm2(AWG)42.4 67.4 (1 2/0) 13.3 (6)85.0 127 (3/0 250) 21.3 (4)152 20
7、3 (300 400) 26.7 (3)253 (500) 33.6 (2)4.1.1.8.4 A grounded circuit conductor larger (oversized neutral) than the largest ungrounded circuitconductor shall be permitted.RATIONALE FOR DECISION:The grounding conductors described in Section 4.1.1.8 were based on the requirements for flexible cordsand ca
8、bles up to 2 AWG. When electric vehicle cables were added to UL 62 in sizes above 2 AWG, thesize of the grounding conductors was not addressed. The sizes of the grounding conductors shown inTable XX are based on the ampacity values in Table 400.5(A)(2) and 250.122 in the NEC.UL COPYRIGHTED MATERIAL
9、NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThe requirements for the grounding conductor for use with a 9 AWG conductor were added. When theodd AWG sized conductors were added to UL 62, this section was overlooked. Based on the establishedrequirements, a cable co
10、ntaining 10 AWG circuit conductors would require a 10 AWG groundingconductor and a cable containing 8 AWG circuit conductors would also allow a 10 AWG groundingconductor. Therefore, it is logical to allow a 10 AWG grounding conductor for cables containing 9 AWGcircuit conductors.Copyright 2015 Under
11、writers Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Und
12、erwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requiremen
13、t Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 62 -2-
