UL 1059 CRD-2013 UL Standard for Safety Terminal Blocks - Section Paragraph Reference Sec 50 3 1 Subject Clarification of time interval between current applications (Edition 4 Dece.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): XCFR2Standard Number: UL 1059Standard Title: Standard for Terminal BlocksEdition Date: December 27, 2001Edition Number: 4Section / Paragraph Reference: Sec.

3、50.3.1Subject: Clarification of time interval between current applications.DECISION:50.3.1 Following the measurement of voltage drop, three separate applications of the test currentspecified in Table 50.1 are to be applied, one after another, through the current paths 1-1 and 2-2, asappropriate, as

4、shown in Figure 50.2. The test current is to be applied for 1 second during eachapplication with an interval of 6 minutes or less more between applications of the current. There shall beno damage to the terminal block or its support.RATIONALE FOR DECISION:The proposed revision provides clarification

5、 of the test method and is intended to be consistent with themethod described in IEC 60947-7-2, Par. 8.4.6. The IEC method specifies a pause of 6 minutes minimumshall be allowed between current surges. This is also replicated in UL 60947-7-2. The proposed changeto UL 1059 will then coincide with the

6、se two documents.The intent is to provide a sufficient cool down period (minimum of 6 min) for the test specimen to recoverbefore application of the next current surge. The existing wording permits the application of anysubsequent test current immediately and not permitting sufficient recovery time.

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9、ification 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electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1059 -2-No Text on This Page