1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories (UL). Itis normative for the applicable
2、UL Product Certification Program(s); however, it is currently not part ofthe UL Standard(s) referenced below.Product Category (CCN): NIMX NJOT, NKCR, NKJH, NLDX, NLRV, NRNTStandard Number: UL 60947-4-1AEdition Date: January 26, 2007Edition Number: 2Section / Paragraph Reference: Footnote f of Table
3、C.4.4DV.1DECISION:Revise footnote f of Table C.4.4DV.1 as follows:fThese spacings are also applicable between any uninsulated live parts and the walls of a cast metalenclosure with a wall thickness of minimum 3.2 mm for devices rated 0 600V. without a short circuitrating and complying with footnote
4、a or b.Add superscript “f” in front of superscript “g” following “Other than enclosure walls” in the 3rd column oftable C.4.4DV.1.RATIONALE FOR DECISION:Footnote f is included in table C.4.4DV.1 but is not referenced in any of the columns. In addition, thefootnote is applicable to devices with limit
5、ed ratings only.When a cast metal enclosure is 3.2 mm thick or greater, spacings to the enclosure may be as specifiedfor creepage and clearance since cast metal enclosures of such thickness will not readily deform as aresult of impacts to the enclosure. Also, the characteristics of cast metal are in
6、dependent of the ratings ofthe drive, so the limitation of ratings is unnecessary. In order to keep these spacing requirementsconsistent with those in UL 508, the footnote is applicable to devices rated 0 600V only.Copyright 2007 Underwriters Laboratories Inc.UL, in performing its functions in accor
7、dance 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 Underwriters Laboratories Inc. inpractically applying the requiremen
8、ts 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 Requirement Decisions by anyone. UL shall not incurany obligation or liabil
9、ity 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 customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 60947-4-1A -2-No Text on This Page
