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): QIJB2Standard Number: UL 3730Standard Title: Standard for Photovoltaic Junction BoxesEdition Date: November 11, 2014Edition Number: 1Section / Paragraph Refe
3、rence: Table 4.1Subject: Expansion of UL 3730 to include junction boxes up to 1500 V dc or lessDECISION:4.2 Nonmetallic enclosures and polymeric materialsTable 4.1Determination of comparative tracking index performance level category (PLC)Voltage Creepage distance IPT 1 hr rating required CTI PLC of
4、 2 or betterrequired0 30 Any No No 30 600 30600 12.7 mm No No 600 1000 600 1000 16.0 mm No No1001 1500 24.0 mm Yes No1001 1500 24.0 mm No NoNote - Voltage is determined as follows:Between live parts: the maximum potential difference during normal useBetween live parts and dead metal parts that may b
5、e grounded in service: maximum systemvoltageBetween live parts and any surface exposed to contact: maximum system voltages 35 36,and SectionRATIONALE FOR DECISION:As a result of changes to UL 1703, the Standard for Flat-plate Photovoltaic Modules and Panels, UL hasalso expanded the scope of UL 3730.
6、 The basis for this change is explained in the rationale for the CRDUL 1703. This rationale is provided below:A need exists to be able to rate PV modules with maximum system voltages up to 1500 Vdc.The current maximum of 1000 Vdc limits the ability of industry to efficiently deliver power from PVmod
7、ules. Raising the maximum system voltage rating limit to 1500 Vdc allows the industry to increasepower production while maintaining existing current levels, leading to more efficient use of wiring andbalance of system components such as combiner boxes, fuses, and inverters.The components used in the
8、 manufacturing of PV modules and the devices used to install PV modules inthe field are suitable for system voltages of at least 1500 Vdc. This proposal expands UL 1703 to addressthe creepage and clearances needed to provide suitable isolation of live circuits at 1500 Vdc or less.UL COPYRIGHTED MATE
9、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCopyright 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 th
10、at they will be recognized or adoptedby anyone. Certification Requirement 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
11、) 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, 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 3730 -2-
