UL 60947-7-3 (ND)-2017 National Differences For Low-Voltage Switchgear and Controlgear C Part 7-3 Ancillary Equipment C Safety Requirements for Fuse Terminal Blocks (Third Edition).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForLow-Voltage Switchgear and Controlgear Part 7-3: Ancillary Equipment Safety Requirementsfor Fuse Terminal BlocksUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUC

2、TION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForLow-Voltage Switchgear and Controlgear Part 7-3: Ancillary Equipment Safety Requirements forFuse Terminal BlocksThird EditionEdition Date: January 27, 2017This revision of ANSI/UL 60947-7-3 is to revise the National Differences to

3、 include Canada. Thisstandard is harmonized for Canada, Mexico and the United States and co-published by all threestandards development organizations (CSA Group, ANCE and UL).This document provides a single listing of the National Differences included in the UL adoption ofthe corresponding IEC stand

4、ard.All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwisewithout prior permission of UL.UL provides this standards document as is without warranty of any k

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6、r damages arising out of the use of or theinability to use this standards document, even if UL or an authorized UL representative has been advisedof the possibility of such damage. In no event shall ULs liability for any damage ever exceed the pricepaid for this standards document, regardless of the

7、 form of the claim.Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonableattorneys fees) resulting from any error or deviation introduced while purcha

8、ser is storing an electronicStandard on the purchasers computer system.Copyright 2017 Underwriters Laboratories Inc.JANUARY 27, 2017NATIONAL DIFFERENCES FOR2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPrefaceThis document provides a single

9、 listing of the technical National Differences included in the UL adoptionof the corresponding IEC standard.In its IEC-based standards, UL uses the notations indicated below to identify national difference type, andthese types are additionally noted in this document. The standard may not use all typ

10、es of thesedeviations.D1 - These are deviations which are based on basic safety principles and requirements, elimination ofwhich would compromise safety for U.S. consumers and users of products.D2 - These are deviations based on safety practices. These are deviations for IEC requirements that maybe

11、acceptable, but adopting the IEC requirements would require considerable retesting or redesign on themanufacturers part.DC - These are deviations based on the component standards and will not be deleted until a particularcomponent standard is harmonized with the IEC component standard.DE - These are

12、 deviations based on editorial comments or corrections.DR - These are deviations based on the national regulatory requirements.Each national difference contains a description of what the national difference entails. Typically one of thefollowing words is used to explain how the text of the national

13、difference is to be applied to the base IECtext:Addition / Add - An addition entails adding a complete new numbered clause, subclause, table, figure,or annex. Addition is not meant to include adding select words to the base IEC text.Deletion / Delete - A deletion entails complete deletion of an enti

14、re numbered clause, subclause, table,figure, or annex without any replacement text.Modification / Modify - A modification is an altering of the existing base IEC text such as the addition,replacement or deletion of certain words or the replacement of an entire clause, subclause, table, figure,or ann

15、ex of the base IEC text.JANUARY 27, 2017 NATIONAL DIFFERENCES FOR 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences1.1DV D2 Modification by adding the following:This standard specifies requirements for fuse terminal blocks

16、with screw-type orscrewless-type clamping units for the connection of rigid (solid or stranded) or flexiblecopper conductors for the reception of cartridge fuse-links, in accordance with AnnexDVB, National Electrical Code, NFPA 70 (for use in the USA), CSA C22.115 CanadianElectrical Code, Part I (fo

17、r use in Canada), and NOM-001-SEDE, Electrical Installations(Utility) for use in Mexico.1.2DV DR Modification by adding the following:For a list of Canada, Mexico, and USA Normative Standards, see Annex DVA of thisstandard.2.1DV D2 Modification by replacing 2.1 with the following:fuse terminal block

18、 terminal block base with or without a fuse carrier.3DV.1 D2 Modification by adding the following item:cDV) fuse terminal block without a fuse-carrier, e.g. fixed mounted fuse clips.3DV.2 D2 Modification by adding the following:Clause 3, Classification, of Annex DVA, Item A applies.3DV.3 D3 Modific

19、ation by adding the following:In Canada, the general requirements applicable to this Standard are provided inCAN/CSA-C22.2 No. 0.4.1DV D2 Addition:Dimensions of cartridge fuse-link shall be stated.4.2DV D2 Modification by adding the following:Subclause 4.2 does not apply in the United States.4.3DV D

20、2 Modification by adding 4.3.7DV and 4.3.8DV:4.3.7DV D2 Type of terminal blockSubclause 4.2, Type of terminal block, of Annex DVA, Item A applies.JANUARY 27, 2017NATIONAL DIFFERENCES FOR4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4.3.8DV

21、D2 Rated and limiting valuesSubclause 4.3.6DV.1, Rated and limiting values, of Annex DVA, Item A applies.5.2DV.1 D2 Modification by replacing item a) with the following:a) to Annex DVA, Item F (NMX-J-515-ANCE), if the manufacturer claims compliance withthis standard;5.2DV.2 D2 Deletion of items g) a

22、nd h):These items are not applicable.5.2DV.3 D2 Modification by adding the following:Subclause 5.2DV, Additional information, of Annex DVA, Item A applies.5.3DV D2 Deletion:Subclause 5.3 does not apply.7.1DV D2 Modification by adding the following:Subclause 7.1, Constructional requirements, of Annex

23、 DVA, Item A applies as modified bythe requirements of 7.1.1 through 7.1.9 DV and addition of 7.1.5 DV.7.1.1DV D2 Modification by replacing 7.1.1 with the following:7.1.1DV.1 A metal part for mounting or holding contact clips shall be securely and rigidlyfastened to the supporting base or mounting s

24、urface. All current-carrying parts shall beprevented from turning or shifting in position by means other than friction betweensurfaces.NOTE: Turning or shifting may be prevented by the use of two screws or rivets, bynoncircular shoulders or mortises, by a dowel pin, lug, or offset, by a connecting s

25、trap orclip fitted into an adjacent part, or by an equivalent method.7.1.1DV.2 For Canada and the USA, where parts are held together by screws, a threadedpart shall not have fewer than two full, clean-cut threads. Threads shall not be finer than12-24, 10-32, 8-32, and 6-36 if the screw extends all t

26、he way through the threaded part. Ifthe screw does not extend all the way through the threaded part, it shall engage full,clean-cut threads for a distance of not less than the diameter of the screw.7.1.1DV.3 Copper and brass are not acceptable for the plating of an iron or steelwire-binding screw, n

27、ut, or stud terminal, but a plating of zinc is acceptable.7.1.2DV D2 Modification by adding the following:7.1.2DV.1 A mounting-screw hole shall be located or countersunk so that there will be aspacing of not less than 12.7 mm over the surface of the insulating material between thehead of the screw o

28、r washer and the nearest uninsulated live part.JANUARY 27, 2017 NATIONAL DIFFERENCES FOR 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.2DV.2 A mounting-screw hole located between uninsulated live parts of oppositepolarity shall be count

29、ersunk unless barriers of the equivalent are provided to prevent thescrewhead from being in the path of a possible arc between such live parts.7.1.2DV.3 For Canada and the United States, testing per 8.3.2 is not required.7.1.8DV D2 Modification by adding the following:For Canada and the United State

30、s, products claiming safety from finger touch shall be IP20. Products not claiming safety from finger touch shall be IP 00. Definitions of IP Codescan be found in IEC 60529.7.1.9DV D2 Addition:Contact clips of cartridge fuse terminal blocksEnd stops in the contact clips, or other suitable means, sha

31、ll be provided to ensure theproper location of a fuse-link.7.2.1DV D2 Modification by adding the following:Subclause 7.2.6DV.1, Test of mechanical strength of clamping units, Subclause 7.2.6DV.2,Tab pull test, and Subclause 7.2.6DV.3, Solid-wire tightening test, of Annex DVA, Item Aapply.7.2.2.1DV D

32、2 Modification by adding the following:Subclause 7.2.2, Dielectric properties, of Annex DVA, Item A applies.7.2.2.2DV D2 Deletion:Subclause 7.2.2.2 does not apply.7.2.2.3DV D2 Modification by adding the following and Table 7.2.2.3DV:For Canada and the United States, the temperature rises of a fuse t

33、erminal block shall notexceed the values listed in Table 7.2.2.3DV. For Mexico, the temperature rises on a terminalblock shall not exceed the applicable values specified in Table 7.2.2.3DV, except any bus,strap or fuse clip when tested with a fuse, and pressure terminal connectors for fieldinstalled

34、 conductors shall not exceed 45 K.JANUARY 27, 2017NATIONAL DIFFERENCES FOR6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 7.2.2.3DVMaximum acceptable temperature risesMaterials and components C (F)1. Insulation base aa2. Any bus, strap

35、or fuse clip when tested with a dummy fuse 30 (54)3. Any bus, strap or fuse clip when tested with a fuse 85 (185)4. Pressure terminal connectors for field installed conductors 50b(90)bNOTE - These limits do not apply to an insulated conductor or other material that has been investigated and foundacc

36、eptable for a higher temperature.aRated temperature limit of material minus test ambient temperature.bIn a fuse type terminal block tested with dummy fuse links, the recorded temperature rise shall be increased20C to represent the heating of fuses.7.2.2.4DV D2 Modification by adding the following:Fo

37、r Canada and the United States, Subclause 7.2.5, Electrical performance after ageing (forscrewless-type terminal blocks only), of Annex DVA, Item A applies.7.2.3DV D2 Modification by adding the following:For Canada and the United States, subclause 7.2.3 does not apply.8.3.1DV D2 Modification by addi

38、ng the following dashed items to the list: tab pull test (8.3.6DV); solid wire tightening test (8.3.7DV).8.3.2DV D2 Modification by adding the following:For Canada and the United States, subclause 8.3.2 does not apply.8.3.3.4DV D2 Modification by adding the following:For Canada and the United States

39、 subclause 8.3.3.4 does not apply.8.3.4DV D2 Deletion:Subclause 8.3.4 does not apply.8.3.5DV D2 Deletion:Subclause 8.3.5 does not apply.8.3.6DV D2 Addition:8.3.6DV.1 Tab pull testSubclause 8.3.3.6DV.1 of Annex DVA, Item A applies.JANUARY 27, 2017 NATIONAL DIFFERENCES FOR 7UL COPYRIGHTED MATERIAL NO

40、T AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.3.7DV D2 Addition:8.3.7DV.1 Solid wire tightening testSubclause 8.3.3.6DV.2 of Annex DVA, Item A applies.8.4.1DV D2 Modification by adding the following dashed items to the list: verification of clearances and creepage

41、distances (8.4.2DV) temperature-rise for screw-less and insulation displacement terminal blocks(8.4.8DV) ageing test for insulation displacement terminal blocks (8.4.9DV)8.4.2DV D2 Modification by adding the title “Verification of clearances and creepagedistances” and replacing this subclause with t

42、he following:Subclause 8.4.2 of Annex DVA, Item A applies.8.4.3DV D2 Modification by replacing with the following:Subclause 8.4.3 of Annex DVA, Item A applies.8.4.4DV D2 Deletion:Subclause 8.4.4 does not apply.Figure 1DV D2 Modify Figure 1 by replacing it with Figure 1DV:JANUARY 27, 2017NATIONAL DIF

43、FERENCES FOR8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.4.5DV.1 D2 Modification by replacing the first paragraph with the following:Three fuse terminal blocks shall be installed side by side on a support according to Figure1DV as in nor

44、mal use, together with the required accessories and the minimum gauge no.2 or no. 5 inserted according to Table A.1. A dummy fuse-link made of copper alloy, platedor un-plated, is permissible.8.4.5DV.2 D2 Addition:A variation of less than 1 K between any two out of three consecutive measurements mad

45、eat an interval of 5 min is considered as steady temperature.8.4.7DV D2 Modification by adding the following:For Canada and the USA, Subclause 8.4.7DV.1 of Annex DVA, Item A applies.8.4.8DV D2 Addition:8.4.8DV.1 Temperature-rise for screwless and insulation displacement terminal blocksSubclause 8.4.

46、7DV.2.2 of Annex DVA, Item A applies.JANUARY 27, 2017 NATIONAL DIFFERENCES FOR 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.4.9DV D2 Addition:8.4.9DV.1 Ageing test for insulation displacement terminal blocksSubclause 8.4.7DV.4 of Annex D

47、VA, Item A applies.8.5.1DV D2 Modification by adding the following dashed item to the list: thermoplastic insulation stress relief test (8.5.5DV).8.5.2DV D2 Modification by adding the following:For Canada and the United States, subclause 8.5.2 does not apply.8.5.3DV D2 Modification by adding the fol

48、lowing:For Canada and the United States, subclause 8.5.3 does not apply.8.5.4DV D2 Modification by adding the following:For Canada and the United States, subclause 8.5.4 does not apply.8.5.5DV D2 Addition:8.5.5DV.1 Thermoplastic insulation stress relief testSubclause 8.7DV of Annex DVA, Item A appli

49、es.Table C.1DV D2 Modification by adding the following text and Table CDV.1:Table C.1 or Table CDV.1 applies.Table CDV.1 Order of tests and number of specimensTest group Test no. Number ofspecimensTest According tosubclause1 1.1 2 of 5 Attachment of the fuse terminal blockon its supporta8.3.22 2 of 5 Mechanical properties of clamping units2.1 Contact resistancea8.4.42.2 Test of mechanical strength of clampingunits8.3.3.12.3 Contact resistancea8.4.43 3.1 2 Test for damage and accidentalloosening of conductors of a fuseterminal block (flexion test)8.3.3