1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): DIHS, DIHS2Standard Number: UL 489Standard Title: Standard for Molded-Case Circuit Breakers, Molded-Case Switchesand Circuit-Breaker EnclosuresEdition Date: October 24, 2016Edition Number: 13Section /
3、 Paragraph Reference: 14.1.4.3; Table 14.1.4.1 and Table 15.1.1Subject: Extend Wire Range of Accessories to 24 AWGDECISION:14.1.4.3 Terminal leads shall be 2422 AWG (0.20 mm2) minimum. The free length of a terminal lead shallbe at least 150 mm (6 inches).Table 14.1.4.1Ampacities of insulated conduct
4、orsWire size 60C (140F)AWG (mm2) Copper Aluminum24 (0.20) 2 22 (0.32) 3 20 (0.52) 5 18 (0.82) 7 16 (1.3) 10 Table 15.1Pull forceWire size, AWG Force, N (lbf)18 and larger 89 (20)20 2224 44.5 (10)RATIONALE FOR DECISION:The accessory terminal lead wire size is currently limited to 22 AWG minimum. Vari
5、ous other standardsfor wiring leads on devices and terminal blocks allow for wire smaller than 22 AWG. This proposalchanges the minimum wire size from 22 AWG to 24 AWG.Copyright 2016 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrect
6、ness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the standard. They do not represent formal interpretations of the standard underAmer
7、ican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM
8、 ULobligation or liability for damages, including consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 489 -2-
