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): DGZZStandard Number: UL 588Standard Title: Standard for Seasonal and Holiday Decorative ProductsEdition Date: October 26, 2015Edition Number: 19Section / Par
3、agraph Reference: 13.2.4Subject: Addition of CXTW-ISDECISION:13.2.4 The wire employed in a series-connected seasonal product shall be a minimum 22 AWG (0.32mm2) Type CXTW twisted conductor or 22 AWG (0.32 mm2) Type XTW, with a minimum insulationtemperature of 105C (221F). Type CXTW and XTW wire are
4、suitable for both indoor and outdoor use.Exception No. 1-5 are not shown for brevityException No. 6: A series-connected lighting string employing 22 AWG conductors is permitted to employsingle conductor CXTW-IS or CXTW-S cord.RATIONALE FOR DECISION:UL 588 currently permits single conductor CXTW to b
5、e used if it is twisted with a non-current carryingpolymeric supporting rope or a single conductor CXTW-S where the strength member is provided with thecopper conductors. There are other technologies that similar mechanical strength can be achieved. UL 62,the Standard for Flexible Cords recently int
6、roduced a new conductor Type CXTW-IS that can be shownto have the equivalent strength to the breaking strength of a 2-conductor, twisted 22 AWG CXTW (UL 588,13.2.4), or to the breaking strength of a single conductor CXTW twisted with a supporting rope (UL 588,81A.1). Therefore, CXTW-IS is being adde
7、d as an exception to Type CXTW twisted pair construction inUL 588. The exception is also being clarified that the exception is only for lighting strings employing 22AWG conductors.Copyright 2016 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not
8、 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 Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not rep
9、resent 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 Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including conseque
10、ntial 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 customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 588 -2-No Text on This Page
