UL 1310 CRD-2013 UL Standard for Safety Class 2 Power Units - Section Paragraph Reference Table 33 1 Section 70 Subject Maximum acceptable surface temperature for permanently conn.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): QQIJStandard Number: UL 1310Standard Title: Standard for Class 2 Power UnitsEdition Date: August 26, 2011Edition Number: 6Section / Paragraph Reference: Tabl

3、e 33.1, Section 70Subject: Maximum acceptable surface temperature for permanently connected unitsDECISION:Table 33.1Maximum acceptable temperature risesMaterials and components C (F)A. COMPONENTS1. Rubber- or thermoplastic-insulated conductorsa35 (63)2. Silicon componentsb75 (135)B. ELECTRICAL INSUL

4、ATION GENERAL1. Class 105 insulation systems:Resistance method 75 (135)Thermocouple method 65 (117)2. Class 120 insulation systems:Resistance method 85 (153)Thermocouple method 75 (135)3. Class 130 insulation systems:Resistance method 95 (171)Thermocouple method 85 (153)4. Class 155 insulation syste

5、ms:Resistance method 115 (207)Thermocouple method 110 (198)5. Class 180 insulation systems:Resistance method 135 (243)Thermocouple method 125 (225)6. Class 200 insulation systems:Resistance method 150 (270)Thermocouple method 140 (252)7. Class 220 insulation systems:Resistance method 165 (297)Thermo

6、couple method 155 (279)8. Fiber employed as electrical insulation 65 (117)9. Phenolic compositiona125 (225)10. Varnish-cloth insulation 60 (108)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 33.1 ContinuedMaterials and components C (F)C

7、. SURFACES1. Surface temperature, metalc,d30 (54)2. Surface temperature, nonmetallicc,e50 (90)3. Wood or similar material 65 (117)aThe limitation on phenolic composition, rubber and thermoplastic insulation does not apply to compounds thathave been investigated and found to be acceptable for use at

8、a higher temperature. The maximum acceptabletemperature rise in any case is 25C (77F) less than the acceptable temperature limit in question.bDoes not apply to a material that has been investigated and found acceptable for a higher temperature.cA material having a coefficient of thermal conductivity

9、 greater than 2.419 Btu per hour per square foot per foot perdegree Fahrenheit (0.01 c/s/cm2/cm/C) is considered to be metal. See 33.7.d45C (81F) rise for semipermanent mounted and permanently connected units marked as required by 52.5 and70.2 respectively.e65C (117F) rise for semipermanent mounted

10、and permanently connected units marked as required by 52.5 and70.2 respectively.70 Markings70.2 A permanently connected unit that exceeds the surface temperature limits specified in Table 33.1 foreither metallic or nonmetallic shall be legibly marked where readily visible after installation with the

11、 signalword of 52.1 and the following or the equivalent: “HOT SURFACES Risk of Burns Do not touch.”RATIONALE FOR DECISION:Currently there is no surface temperature limitation being addressed specifically for permanentlyconnected units. Table 33.1 and clause 70.2 have been modified/added to supplemen

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13、rement 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) processes. UL shall not be responsible toanyone for the use of or

14、 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 1310 -2-