1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): DGZZStandard Number: UL 588Standard Title: Standard for Seasonal and Holiday Decorative ProductsEdition Date: October 26, 2015Edition Number: 19Subject: Parallel-connected Lighting Strings Employing 1
3、8 AWG ConductorsDECISION:Table 13.1Maximum conductor current and overcurrent protectionWire size, Maximum conductor current / wattage Overcurrent protectionAWG (mm2) amperes / watts amperes12 (3.31) 12 / 1440 N/A14 (2.08) 12 / 1440 N/A16 (1.31) 10 / 1200 10b18 (0.82) 8a/ 960 8a20 (0.52) 3.6 / 432 52
4、2 (0.32) 1.8 / 216 3aWhen an8Afuseisemployed, the maximum current shall not exceed 8 A. Whena5Afuseisemployed,themaximumcurrent shall not exceed 3.6 A.bOvercurrent is required only when more than 3 load fittings are employed. A maximum of 6 load fittings are permitted whenovercurrent protection is p
5、rovided.29.1 A parallel-connected string shall employ only intermediate- or candelabra-screw lampholders, andshall have at least 7 lampholders, butand the total wattage of the lighting string shall not exceed thewattage indicated in Table 13.1 for the wire size. 216 Watts (1.8 A) when a cord connect
6、or is provided or432 Watts (3.6 A) when no cord connector is provided.125.4.3 A lighting string or a decorative outfit consisting of a lighting string with decorative covers whichthat employs a polarized load fitting shall be marked within 3 inches (76.2 mm) of the face of the loadfitting with the w
7、ord “CAUTION” and the following: “This lighting string is rated _ Watts (_ Amps), donot overload. Connect other lighting strings or decorative outfits end-to-end up to a maximum of 432_Watts (3.6 _Amps) total.” The first blank shall be filled in with the rated wattage of the product.The second blank
8、 shall be filled in with the rated amperage of the product. The third blank shall be filledin with the conductor wattage based on 120 V times the maximum conductor current described in Table13.1. The fourth blank shall be filled in with the maximum total current in Amps described in Table 13.1.Addit
9、ional instructions shall be provided with the user servicing instructions to further explain the wattage,where to find the wattage rating on the product and where to find the current rating on products that donot contain a wattage rating.125.5.1 A product with an input current in excess of 1.875 A o
10、r which employings more than 30parallel-connected lampholders in accordance with 29.1A, shall be marked with the following: CAUTION- Do not connect to another lighting string, decorative outfit, or seasonal product.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOU
11、T PERMISSION FROM ULRATIONALE FOR DECISION:UL588 was recently revised to increase the permitted maximum conductor current of 18 AWG to 8 ampsas shown in Table 13.1. However, the requirements for the interconnection of parallel-connected lightingstrings employing were not updated to reflect the highe
12、r wattage permitted when employing 18 AWG wire.Paragraph 125.5.1 is being revised to align with the 1.8A, 216W requirements elsewhere in the Standardand deletes the reference to the number of lamps that can be interconnected to be consistent with Par.29.1.Copyright 2018 UL LLCUL LLC, in performing i
13、ts 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 opinion of UL LLC. in practically applying therequirements
14、 of the standard. They do not represent formal interpretations of the standard underAmerican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or
15、liability for damages, including consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement 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 588 -2-
