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): QQVXStandard Number: UL 183Standard Title: Standard for Manufactured Wiring SystemsEdition Date: September 22, 2009Edition Number: 4Section / Paragraph Refer
3、ence: 15.6, 7.1 Exception No. 2Subject: MC-PCS cables with non Class 2 power conductors.DECISION:15.6 Class 2 or 3 powered conductors shall not be run in AC, MC cables, flexible metal conduit or cordswith non Class 2 or 3 powered conductors. Class 2 or 3 powered conductors may be run in MC-PCScables
4、 with non Class 2 or 3 powered conductors.7.1 Exception No. 2: Conductors for use in remote control, signaling, or communications circuits may besmaller than 12 AWG. Class 2 or 3 powered conductors may be run in MC-PCS cables with non Class 2or 3 powered conductors.RATIONALE FOR DECISION:The rationa
5、le for the revision included with the December 5, 2014 Subject 183 proposal to add a newClause 15.6 was as follows:“To address the issue of Class 2 and 3 circuit conductors being placed within the same raceway (AC, MC,FMC or S cord) as the electric light and power conductors clause 15.6 is proposed.
6、 Refer to NEC Article725.136(A) of the National Electrical Code, NFPA 70.”At the time that the Subject 183 proposal was issued, there was a Subject 1569 (MC Cable) CRD in affectthat permitted Class 2 and 3 circuit conductors to be placed within the same cable as the electric light andpower conductor
7、s. The cable complies with NEC Article 725.136(I) which permits Class 2 and 3 circuitconductors to be placed within the same cable as the electric light and power conductors where the Class2 and Class 3 conductors are separated from electric light and power conductors within the cable by ajacket ove
8、r the Class 2 and 3 conductors. The Cable is designated by UL 1569 as Type MC-PCS cable.The rationale for the CRD and eventual proposal is that Type MC-PCS cable is listed and complies withNEC Article 725.136(I) which permits Class 2 and 3 circuit conductors to be placed within the same cableas the
9、electric light and power conductors where the Class 2 and Class 3 conductors are separated fromelectric light and power conductors within the cable by a jacket over the Class 2 and 3 conductors.Copyright 2015 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its object
10、ives, 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 Underwriters Laboratories Inc. inpractically applying the requirements of the standard. T
11、hey 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 Requirement Decisions by anyone. UL shall not incurUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FU
12、RTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULany 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 183 -2-
