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): GPWV/GPRTStandard Number: UL 507Edition Date: December 13, 1999Edition Number: 9Section / Paragraph Reference: 2.3.9ASubject: Usable Normal Condition Clarifi
3、cationDECISION:2.3.9A USABLE NORMAL CONDITION - Operation in excess of 25 rpm for ceiling suspended fans andoperation at 10% or greater of measured as-received high speed rpms for all other fans, excluding fansfor use in unattended areas.Exception No. 1: For fans intended for use in unattended areas
4、 aAn increase in volume or change in pitchof noise emitted from the fan is considered to signify an abnormal condition.Exception No. 2: Operation of a motor thermal protector prior to temperature stabilization is considered tosignify an abnormal condition.RATIONALE FOR DECISION:Previous discussion
5、regarding “usable normal condition” centered on the users inability to observe rpmfor unattended area fans. However, noise changes and increases are considered to be a viable indicatorof abnormal operation for all fan types.Copyright 2011 Underwriters Laboratories Inc.UL, in performing its functions
6、 in accordance 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 r
7、equirements 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
8、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electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 507 -2-No Text on This Page
