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): DIVQStandard Number: UL 489Standard Title: Standard for Molded-Case Circuit Breakers, Molded-Case Switchesand Circuit-Breaker EnclosuresEdition Date: January
3、 15, 2013Edition Number: 12Section / Paragraph Reference: 6.1.4.3.6Subject: Revision to Field Wiring Conductor LengthDECISION:6.1.4.3.5 The free length of a wiring conductor shall be at least 152 mm (6 inches).6.1.4.3.6 Notwithstanding 6.1.4.3.5, the free length of a wiring conductor may be less tha
4、n 152 mm (6inches) when all of the following conditions are met:a) The wire described in 6.1.4.3.1 shall be of a solid construction only,b) The device shall be manufactured with the conductor factory installed and formed asintended to be field installed in the specified end use equipment,c) The cond
5、uctor is of sufficient length for connection in the specified end-use equipment,d) The device shall be marked for use only in specific end-use equipment. This informationmay be provided with the installation instructions if the device is marked to reference theappropriate publication,e) Instructions
6、 for installation shall be provided with the device unless completely obvious,f) The acceptability of the device shall be determined in the end-use equipmentRATIONALE FOR DECISION:This CRD is intended to allow a shorter minimum length of a field wiring conductor of a circuit breaker.The present requ
7、irement in UL 489 for the length of the field wiring conductor is, “at least 152 mm (6inches)”. With the increased use of circuit breakers requiring a field installed connection to the neutral bar,manufacturers have requested other solutions by providing a design with a shorter conductor that isinte
8、nded to be installed into specific end-use equipment. This wiring conductor would be pre-formed at thefactory to the correct shape for termination during the installation process.Copyright 2015 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not
9、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. They do not repr
10、esent formal interpretations of theUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULstandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requir
11、ement Decisions by anyone. UL shall not incurany 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 489 -2-
