UL 2017 CRD-2016 UL Standard for Safety General-Purpose Signaling Devices and Systems - Section Paragraph Reference 37 37 1 Subject Revision to Require Leakage Current Test Only .pdf

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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): UEHX, UDTZ, QVAX, UDGJ, UXPL, FSZI, FSYEStandard Number: UL 2017Standard Title: Standard for General-Purpose Signaling Devices and SystemsEdition Date: Decem

3、ber 23, 2008Edition Number: 2Section / Paragraph Reference: 37 / 37.1Subject: Revision to Require Leakage Current Test Only For Cord-connectedProducts.DECISION:37 Leakage Current Test37.1 When the Where a cord-connected product is powered by a source greater than 42.4 V peak, theleakage current at a

4、ny exposed surface, or between any accessible part and earth ground, or any otheraccessible part with an open circuit potential of is greater than 42.4 volts peak as measured between anyaccessible part and earth ground or any other accessible part, the leakage current at any accessible partshall not

5、 be more than the following values when tested in accordance with 37.2 - 37.7:a) 0.5 milliampere for an ungrounded (2-wire) portable, stationary, or fixed product;b) 0.5 milliampere for a grounded (3-wire) portable product; andc) 0.75 milliampere for a grounded (3-wire) stationary or fixed product.E

6、xception: When an electromagnetic radiation suppression filter is required for the product to function asintended, the leakage current shall not be more than 2.5 milliamperes, when the product complies withthe following conditions:a) The product shall be provided with grounding means in accordance w

7、ith the applicablerequirements for a cord-connected product in Grounding for Products Containing High-VoltageCircuits, Section 24;b) With the filter removed from the product, the leakage current shall not exceed the limitsspecified in 37.1 (b) and (c); as applicable, andc) The product is marked in a

8、ccordance with 83.1.7.RATIONALE FOR DECISION:This revision is to require the Leakage Current Test only for cord-connected products.Fixed equipment is permanently and solidly grounded providing a reliable path for fault current.Cord-connected equipment relies on the mating of an attachment plug and r

9、eceptacle for establishing aground connection which is subject to repeated insertion and withdrawal over the life of the equipment.Although the plug/receptacle provides a secure connection, it is by no means equivalent to the groundconnection for fixed equipment. The main difference between the conn

10、ection methods being permanentUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULversus temporary. The leakage test is only intended to insure that the mating of an attachment plug andreceptacle provides a reliable ground connection; therefore, t

11、he test is primarily applicable tocord-connected products.The Leakage Current test in UL 2017 is also being revised to align with other very similar performancebased standards such as UL 864, UL 916 and UL 2572. A significant number of products Listed to UL864/UL 916/UL 2572 are also complimentary L

12、isted to UL 2017.Copyright 2016 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 Require

13、ment 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) processes. UL shall not be responsible toanyone for the use of or r

14、eliance 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 2017 -2-