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): OBJY2, OBJY3, OBJY8, OBJS2, OBJS3Standard Number: UL 1446Standard Title: Standard for Systems of Insulating Materials - GeneralEdition Date: February 8, 2007
3、Edition Number: 6Section / Paragraph Reference: Section 1Subject: Electrical Insulation Systems - Higher Voltage ApplicationsDECISION:1.1 These requirements cover test procedures to be used in the evaluation of Class 120(E) or higherelectrical insulation systems intended for connection to the low vo
4、ltage side of the distribution networkwhere the thermal factor and not transient overvoltages or partial discharge is the dominating aging factor.These requirements also cover the investigation of the substitution of minor components of insulation ina previously evaluated insulation system and also
5、the test procedures to be used in the evaluation ofmagnet wire coatings, magnet wires, and varnishes.1.5 These requirements do not cover electrical insulation systems where transient overvoltages or partialdischarge are present. Such electrical insulation systems shall be evaluated to the appropriat
6、e standardfor the application. Such standards include, but are not limited to, IEEE C57.12.60, IEEE Standard TestProcedure for Thermal Evaluation of Insulation Systems for Dry-Type Power and Distribution Transformer,Including Open-Wound, Solid-Cast, and Resin-Encapsulated Tranformers.RATIONALE FOR D
7、ECISION:Electrical Insulation Systems (EIS) used in electrotechnical products intended for applications where thereare transient overvoltages or partial discharge, such as dry-type power and distribution transformers,including open-wound, solid-cast and resin encapsulated transformers, have been eva
8、luated for decadesusing the applicable IEEE C57.12 series of standards, to evaluate the effects of these potentialdegradation factors. UL 1446 has been used to evaluate electrical insulation sytems with respect tothermal degradation only, regardless of the application voltage.Therefore, the scope of
9、 the standard should be revised to delete the restriction that the standard onlycovers EIS intended for connection to the low voltage side of the distribution network.Copyright 2015 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or
10、 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 represent formal
11、 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 for damages, including consequential damages
12、 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.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1446 -2-
