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): WEVZ, WEVZ7, AUUZ, AUUZ7, WFJX, WFJX7Standard Number: UL 891Standard Title: Standard for SwitchboardsEdition Date: July 26, 2005Edition Number: 11Section / P
3、aragraph Reference: Table 12Subject: Additional “Type” Ratings for Switchboard EnclosuresDECISION:Table 12Enclosure types(6.2.8.1, 8.2.1.1.2, 8.2.1.4.2)Type number* Intended use and description Qualification tests as specified in:Reference item No. 2 ofAnnex BThis Standard1 Indoor use primarily to p
4、rovide a degree ofprotection against contact with the enclosedequipmentCorrosion Protection orRust ResistanceRod Entry 8.2.1.3.32 Indoor use to provide a degree of protection againstlimited amounts of falling water and dirtCorrosion Protection orRust Resistance and DripRod Entry 8.2.1.3.33R Outdoor
5、use to provide a degree of protectionagainst falling rain, sleet, and external ice formationRain, Icing, andProtective CoatingRod Entry 8.2.1.3.3Latch Pull 9.2.9* In addition to one of the Enclosure Types noted in Table 12, Switchboards may be evaluated for enclosure Types asspecified in Reference I
6、tem No. 2 of Annex B. When applying additional enclosure Types, the Rod Entry (8.2.1.3.3) andLatch Pull (9.2.9) requirements in this Standard apply.RATIONALE FOR DECISION:Installers may need to locate a Switchboard in areas where one of the three noted Enclosure Types(Types 1, 2, and 3R) is not suff
7、icient to address the environmental conditions of the application. TheStandard for Enclosures for Electrical Equipment, Environmental Considerations, UL 50E, includesadditional “Type” ratings that could be used to rate the switchboard enclosure for use in additionalenvironmental applications.Copyrig
8、ht 2015 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 they will be recognized or adoptedby anyone. Certification Requirement Decisions are the o
9、pinion 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 reliance upon Certificati
10、on 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.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 891 -2-
