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): EPBU, QQIJ, IKIQ, FKSZStandard Number: UL 1310Standard Title: Standard for Class 2 Power UnitsEdition Date: August 26, 2011Edition Number: 6Section / Paragra
3、ph Reference: 24.1Subject: Spacing requirements on a semiconductor deviceDECISION:24.1 Spacings between live parts of opposite polarity, between live and dead metal parts, and betweenlive parts and a metal enclosure, shall be as specified in Table 24.1 or Table 24.2, as appropriate. If a livepart is
4、 not rigidly secured in position by a means other than friction between surfaces, or if a movable deadmetal part is in proximity to an uninsulated live part, the construction shall be such that at least theminimum spacings will be maintained.Exception No. 1: Spacings between traces on a printed-wiri
5、ng board need not comply with Tables 24.1and 24.2 if the printed-wiring board complies with the abnormal operation test in 39.8. See also 22.3. Therequirements specified in 22.3 and 39.8 do not substitute for the minimum required spacings between theprinted-wiring board foils and dead metal parts or
6、 the spacings between the primary and secondary foilsof the printed-wiring board as specified in Table 24.1 or 24.2.Exception No. 2: This requirement does not apply to a unit complying with the requirements in 24.5 24.9.Exception No. 3: This requirement does not apply to inherent spacings of a compo
7、nent such as adjacentterminals of a power switching semiconductor device.RATIONALE FOR DECISION:This Certification Requirement Decision (CRD) clarifies the spacing for power switching semiconductors.Copyright 2016 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its o
8、bjectives, 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 Inc. inpractically applying the requirements of the standa
9、rd. 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. UL shall not incurany obligation or liability for damages,
10、 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 1310 -2-No Text on This Page
