UL 5085-2 CRD-2010 UL Standard for Safety Low Voltage Transformers C Part 2 General Purpose Transformers - Section Paragraph Reference Table 8 Subject Maximum temperature rise for.pdf

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): XPTQStandard Number: UL 5085-2Edition Date: April 17, 2006Edition Number: 1Section / Paragraph Reference: Table 8Subject: Maximum temperature rise for Class

3、120(E) transformer insulation systemDECISION:Table 8Maximum temperature rises for transformers rated 10 kVA and less(See Clauses 11.3.5 (Part 1), 17.4.2, 26.6, 28.1, and Table 9)Materials or components C1. Field-wiring conductors or any surface that may be contacted by fieldwiring.35a2. Pressure-ter

4、minal connectors for field-installed conductors other thanas specified in item 3.503. Pressure-terminal connectors used in circuits rated 110 A or less andmarked for use with 75C (167F) wire or 90C (194F) wire.654. Pressure terminals or wire connectors for internal wiring with aluminumconductors unl

5、ess the conductor has been investigated for highertemperature.505. Wire insulation or insulating tubing 35b6. Fiber used as electrical insulation 657 Any point on the exterior of the transformer enclosure than as specifiedin Clauses 17.4.7, 26.10, and 26.11.658. Enclosures with a receptacle 35c9. Co

6、ntacts and fuses 6510. Type S, SJ, SJO, and SO cords 35d11. Sealing compounds Melting point minus 4012. Capacitors Marked temperature limit minus 2513. Coil winding by change-of-resistance method specified in Clause 11.3of Part 1:Insulation system Ambient Hot spot differentialeGeneral purposetransfo

7、rmers:bClass 105(A) 25 10 70Class 120(E) 25 10 80 85Class 130(B) 25 10 95Class 155(F) 25 15 115Class 180(H) 25 20 135Class 200(N) 25 25 150Class 220(R) 25 30 165NOTE If, during the temperature test, the temperature rise on every component is at least 15C less than the maximum shownin this table, the

8、 transformer may be marked as rated for use in a maximum 40C (104F) ambient.aThe maximum temperature rise for 75C (167F) wire is 50C and for 90C (194F) wire is 65C. See also Clause 17.5.4.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 8

9、 ContinuedMaterials or components CbThe maximum temperature rise for material that has been investigated and rated for a higher temperature is the temperaturerating minus 25C.cTemperature rises in excess of 35C, but not greater than 45C, comply when the enclosure is marked in accordance withClause 1

10、7.4.8.dThe limitation on rubber insulation does not apply to compounds that have been investigated and recognized as having specialheat-resisting properties.eThe assumed difference between the average coil temperature determined by the change-of-resistance method and the hottestpoint somewhere withi

11、n the coil.RATIONALE FOR DECISION:The maximum temperature limits for a Class 120(E) insulation system is modified in order to be consistantwith UL 1446.Copyright 2010 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecor

12、rectness 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 interpretation

13、s 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, arising out o

14、f 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 5085-2 -2-