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): CYJVStandard Number: UL 2238Edition Date: May 4, 2011Edition Number: 2Section / Paragraph Reference: Exception to paragraph 6.3.2Subject: End Product Flame T
3、est for Valve EnclosureDECISION:6.3.2 A polymeric material used for the enclosure of a valve fitting shall have a flammability classificationof 5 VA in accordance with the Standard for Tests for Flammability of Plastic Materials for Parts in Devicesand Appliances, UL 94. The flame class rating of th
4、e material shall be determined at the minimumthickness employed at the walls in the device which are critical to the functioning of the enclosure of thedevice.Exception: Rated min HB and complies with the end product Flammability - 127 mm (5 Inch) Flame Testrequirements in the Standard for Polymeric
5、 Materials - Use in Electrical Equipment Evaluations, UL 746C.RATIONALE FOR DECISION:Under UL 429, The Standard for Electrically Operated Values, as an exception, allows an end productflame test per UL 746C for a value with a polymeric electrical enclosure or a polymeric part that is reliedupon to c
6、omplete and maintain the integrity of an electrical enclosure. This CRD is proposing that we adda similar exception to UL 2238.Copyright 2013 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification
7、 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 represent formal interpretations of thestandard under Am
8、erican 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 consequential damages, arising out of or in connectionwith th
9、e 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 2238 -2-No Text on This Page
