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): XJYWStandard Number: UL 60745-1Edition Date: July 31, 2007Edition Number: 4Section / Paragraph Reference: 18.10, K.23.1.10Subject: Electronic switches - “Dangerous Mal
3、function” and Breaking CapacityDECISION:18.10 Electronic circuits shall be so designed and applied so that a fault condition will not render the toolunsafe with regard to electric shock, fire hazard, mechanical hazard or dangerous malfunction.NEW Note: Automatic operation of a switch intended for ma
4、nual actuation of a circular saw or a tool thatresults in the firing of a projectile, movement of an unguarded grinding disc, or an unguarded rotatingblade is considered to be a dangerous malfunction. Independent switches or switch / interlockcombinations for dual activation of the tool are consider
5、ed one at a time.K.23.1.10 Power switches shall have adequate breaking capacity.NEW Note: Any switch or device that when manually activated makes or breaks a motor and / or heaterload is considered a power switch.RATIONALE FOR DECISION:Electronic switches are becoming more prevalent in portable tool
6、s. Unintentional activation of the switchmay result in a risk of injury. The requirements for dangerous malfunction were clarified to identify thosecircumstances and the constructions considered to pose a risk.Copyright 2008 Underwriters Laboratories Inc.UL, in performing its functions in accordance
7、 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 requirements of
8、 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 liability f
9、or 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 60745-1 -2-No Text on This Page
