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): KOHZ, KMLWStandard Number: UL 1996Edition Date: August 31, 2009Edition Number: 4Section / Paragraph Reference: Section 29/Clause 29.1Subject: Update clause 2
3、9.1 to align with Clause 45.2DECISION:29.1 The power and/or current input to a duct heater shall not be more than 105 percent within +/- 5% ofits marked rating.RATIONALE FOR DECISION:The nameplate marking in clause 45.2 of UL 1996 requires that the heater circuit be rated within +/- 5%of the actual
4、input test results. However, the clause 29.1 input test only requires that the measured resultsbe no more than 105% of the marked load. This Certification Requirement Decision is intended to alignclause 29.1 with clause 45.2 and to document present practice.Copyright 2011 Underwriters Laboratories I
5、nc.UL, in performing its functions 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
6、 Inc. inpractically applying the requirements 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.
7、 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electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1996 -2-No Text on This Page
