UL 5085-3 CRD-2010 UL Standard for Safety Low Voltage Transformers C Part 3 Class 2 and Class 3 Transformers - Section Paragraph Reference Table 7 Subject Maximum temperature rise.pdf

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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): XOKVStandard Number: UL 5085-3Edition Date: April 17, 2006Edition Number: 1Section / Paragraph Reference: Table 7Subject: Maximum temperature rise for Class

3、120(E) transformer insulation systemDECISION:Table 7Maximum temperature rises(See Clauses 11.3.5 (Part 1), 31.1 and 31.2)Material C1. Rubber or thermoplastic insulated conductorsa352. Primary circuit field wiringb353. Fuses other than Class CC, G, J, or T, and fuses other thanthose with glass or cer

4、amic bodies654. Class CC, G, J, or T fuses and those fuses with glass orceramic bodies855. Fibre used as electric insulation 656. Varnish-cloth insulation 607. Phenolic compositiona1258. Wood or similar material 659. Class 105(A) transformer insulation system:Resistance method 75Thermocouple method

5、6510. Class 120(E) transformer insulation system:Resistance method 75 85Thermocouple method 65 7511. Class 130(B) transformer insulation system:Resistance method 95Thermocouple method 8512. Class 155(F) transformer insulation system:Resistance method 115Thermocouple method 11013. Class 180(H) transf

6、ormer insulation system:Resistance method 135Thermocouple method 12514. Class 200(N) transformer insulation system:Resistance method 150Thermocouple method 14015. Class 220(R) transformer insulation system:Resistance method 165Thermocouple method 15516. Surface temperature, permanently connected tra

7、nsformer 60UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 7 ContinuedMaterial C17. Polymeric materiald40C less than its temperature ratingaThe limitation on phenolic composition and rubber and thermoplastic insulation do not apply to co

8、mpounds that have beeninvestigated and found to be acceptable for use at a higher temperature; however, the maximum acceptable temperature riseis not to equal or exceed a value that is the acceptable temperature limit for the material in question.bThe maximum temperature rise at primary circuit fiel

9、d wiring may be 65C if the transformer is marked in accordance withClause 17.4.6 and Table 2.cA material having a coefficient of thermal conductivity greater than 4.18 W/MK (2.419 Btuft/hourftF) is considered to bemetal.dMaterial relied upon for enclosure, barriers, or direct support of live parts o

10、ther than coils. Polymeric material used in aClass 105(A) coil insulation system shall have an electrical relative thermal index not less than 105C (221F).RATIONALE FOR DECISION:There was an error in the maximum temperature rise for Class 120 (E) insulation systems. The maximumtemperature limits for

11、 Class 120(E) insulation system is modified in order to be consistent with UL 1446.Copyright 2010 Underwriters Laboratories Inc.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

12、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 interpretations of thestandard under American National Standards Institute (ANSI) p

13、rocesses. 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, 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 5085-3 -2-