UL 60947-7-4 (ND)-2018 National Differences For Low-Voltage Switchgear and Controlgear C Part 7-4 Ancillary equipment C PCB terminal blocks for copper conductors (First Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForLow-Voltage Switchgear and Controlgear Part 7-4: Ancillary equipment PCB terminal blocksfor copper conductorsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO

2、N ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForLow-Voltage Switchgear and Controlgear Part 7-4: Ancillary equipment PCB terminal blocks forcopper conductorsFirst EditionEdition Date: April 27, 2018This First Edition of ANSI/UL 60947-7-4 specifies requirements for PCB terminal blo

3、cks primarilyintended for industrial or similar use.As noted in the Commitment for Amendments statement located on the back side of the titlepage, UL, CSA, and ANCE are committed to updating this harmonized standard jointly.This document provides a single listing of the National Differences included

4、 in the UL adoption ofthe corresponding IEC standard.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 s

5、tandards document as is without warranty of any kind, either expressed or implied,including but not limited to, the implied warranties of merchantability or fitness for any purpose.In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,including loss of

6、 profits, lost savings, loss of data, or any other 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 pricepa

7、id for this standards document, regardless of the 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 fr

8、om any error or deviation introduced while purchaser is storing an electronicStandard on the purchasers computer system.Copyright 2018 Underwriters Laboratories Inc.APRIL 27, 2018NATIONAL DIFFERENCES FOR2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSIO

9、N FROM ULPrefaceThis document provides a single 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

10、this document. The standard may not use all types 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

11、are deviations for IEC requirements that maybe 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

12、 with the IEC component standard.DE - These are 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 i

13、s used to explain how the text of the national 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 -

14、A deletion entails complete deletion of an entire 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

15、 entire clause, subclause, table, figure,or annex of the base IEC text.APRIL 27, 2018 NATIONAL DIFFERENCES FOR 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational DifferencesDV.2 DC Modification to Standard Title:Replace “PCB terminal bl

16、ocks for copper conductors” with “PCB terminal blocks forcopper and aluminum conductors”.1.1DV D2 Modification by adding the following:1.1DV.1 This standard also applies to terminal blocks that have insulation piercing ordisplacement clamping units.1.1DV.2 The wire range for terminal blocks covered

17、by this standard include 0,051 mm2to300 mm2(30 AWG to 600 kcmil) copper conductors and 3,31 mm2to 300 mm2(12 AWG to600 kcmil) aluminum conductors. See Annex DVA for aluminum requirements.In Mexico, 3,31 mm2(12 AWG), 5,26 mm2(10 AWG), and 8,37 mm2(8 AWG) aluminumconductors are not allowed.1.1DV.3 The

18、 voltage range includes up to 1500 Vac and 1500 Vdc.1.2DV D1 Modification to add the following:See Annex DVB for standard references.2.7DV D2 Add the following definitions to Clause 2:2.7DV.1 special preparation (of conductor end)alteration of the manufactured shape or surface of the conductor to en

19、able it to beconnected to the terminal.2.7DV.2 factory wiring terminala terminal intended in the end application to be connected under controlled conditions,usually at a manufacturers location. Such terminations use prepared or unpreparedconductors. Applicable for the United States. In Canada and Me

20、xico, this definition doesnot apply.2.7DV.3 insulation piercing or displacement clamping unita clamping unit for the connection and possible disconnection of one conductor or theinterconnection of two or more conductors, the connection being made by piercing, boringthrough, cutting through, removing

21、, displacing, or making ineffective in some othermanner the insulation of the conductor or conductors without previous stripping.APRIL 27, 2018NATIONAL DIFFERENCES FOR4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.7DV.4 post connectora con

22、nector utilizing a post onto which one or more conductors are secured by means ofa tool.2.7DV.5 SMDa surface mount device2.7DV.6 stud-and-nut type connectora connector in which a conductor can be looped around a stud and retained by a nut or aconnector that can retain a conductor that is first termi

23、nated in a wire connector.3DV.1 D2 Modification by adding the item j) to the list of types of terminal blocks asfollows:j) for field and factory wiring or for factory wiring only. In Canada and Mexico this does notapply.3DV.2 D3 Modification to add the following:In Canada, the general requirements a

24、pplicable to this Standard are provided inCAN/CSA-C22.2 No. 0.4.3.1DV D2 Modification by adding the following:Clause 4.3.1.1 of Table DVB.2, Reference No. 9, applies.4.3.5DV D2 Modification by adding the following:The minimum wire range specified in Table 2 does not apply.4.3.6DV D2 Addition of Clau

25、ses 4.3.6DV.1 4.3.6DV.7 to Clause 4.3:4.3.6DV.1 Rated current The manufacturer shall declare the maximum value of currentper terminal assembly.4.3.6DV.2 Rated torque The tightening torque value or range shall be specified.4.3.6DV.3 In the United States, a terminal block shall be rated for factory wi

26、ring only ifapplicable. In Canada and Mexico this requirement does not apply.4.3.6DV.4 Any special wire types such as pre-bonded, pre-tinned, or double tinned wireshall be specified.APRIL 27, 2018 NATIONAL DIFFERENCES FOR 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTIO

27、N WITHOUT PERMISSION FROM UL4.3.6DV.5 All terminal blocks shall be rated Prime SolidPrime or PrimeStrandedPrime or both as appropriate.4.3.6DV.6 A terminal block having insulation piercing or displacement connections shallbe rated for specific insulation types.4.3.6DV.7 A terminal block having screw

28、less-type terminals shall be rated with a nominalstrip length.5.2DV.1 D2 Modification by adding Clauses 5.2DV.1.1 and 5.2DV.1.2 after item (a):5.2DV.1.1 Item (a) does not apply in Canada and the United States.5.2DV.1.2 In Mexico, replace item (a) with NMX-J-538/7-4-ANCE, if the manufacturer claimsco

29、mpliance with this standard;5.2DV.2 D2 Modification by adding the following items to the list following item (h):i) the rated current. See Clause 4.3.6DV.1;j) the tightening torque. See Clause 4.3.6DV.2. In Canada and Mexico, the tightening torqueneed not be marked unless the manufacturer specifies

30、a tightening torque;k) in Canada and the United States, factory wiring only when applicable. See Clause4.3.6DV.3. In Mexico this does not apply;l) CU or Copper if rated for copper wire only; also see Clause DVA.3.1 for aluminumconductors;m) special conductor preparation or use of prepared conductors

31、. See Clause 4.3.6DV.4;n) specific insulation types (insulation displacement/piercing). See Clause 4.3.6DV.6;o) solid conductors only or stranded conductors only as appropriate. See Clause4.3.6DV.5;p) special conductor types. See Clause 4.3.6DV.4;q) instructions to clearly indicate any rearrangement

32、 or adjustment necessary to adapt tovarious sizes of wires;r) instructions for proper installation of the wire where the wiring method is not obvious;s) a nominal strip length for a terminal block having screwless-type terminals. See Clause4.3.6DV.7;t) rated operational voltage. See Clause 4.3.1DV.6

33、DV D2 Modification by replacing with the following:Refer to standards in accordance with Table DVB.2, Reference No. 9.APRIL 27, 2018NATIONAL DIFFERENCES FOR6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.1DV.1 D2 Modification by replacing

34、 with the following: (U.S. and Canada only)Refer to standards in accordance with Table DVB.2, Reference No. 9.7.1.1DV.1A D2 Addition of the following: (U.S. only)In the U.S. for clamping units rated only for factory wiring, only Clause 8.3.3.1 of Part 7-1is applicable.In Mexico, all of Clause 7.1.1

35、applies.7.1.1DV.2 D2 Addition of Clauses 7.1.1DV.2.1 through 7.1.1DV.2.2.3:7.1.1DV.2.1 Current-carrying parts and their connections7.1.1DV.2.1.1 A current-carrying part intended for use with copper wire shall be of copper,a copper alloy, or other material suitable for the purpose.7.1.1DV.2.2 Wiring

36、terminals7.1.1DV.2.2.1 A wire-binding screw or stud-and-nut type terminal for field wiring may beemployed for conductors not larger than 5,3 mm2(10 AWG), provided that the applicationof normal clamping action as intended will not impair the integrity of the joint. SeeSolid-Wire Tightening Test, Clau

37、se 8.3.3.6dv.2 of Part 7-1.7.1.1DV.2.2.2 A field wiring connector employing a wire-binding screw or stud-and-nutterminal shall be capable of accommodating a three-quarter loop.7.1.1DV.2.2.3 To determine compliance with 7.1.1DV.2.2, the conditions in (a) and (b) shallbe met or, for a solid conductor,

38、 the test described in 8.3.3.6dv.2 of Part 7-1 shall beconducted. A terminal for a stranded conductor shall meet conditions described in (a) and(b).a) The threaded screw or stud shall not have more than 12,6 threads percentimeter and shall not be smaller than 4,2 mm diameter for wire larger than 2,1

39、mm2(14 AWG) and not smaller than 3,5 mm diameter for 14 AWG and smallerwire. A wire-binding screw or stud-and-nut type terminal shall be provided withupturned lugs, a cupped washer, barriers, or other equivalent means to hold thewires in position even if the screw or nut becomes slightly loose.b) Th

40、e tapped terminal plate shall not have less than two full threads, and shallbe of metal not less than 1,3 mm thick for a wire larger than 14 AWG and not lessthan 0,76 mm thick 14 AWG or smaller wire. Threads provided by extruding ahole before tapping shall be counted if the thickness of the unextrud

41、ed metal isnot less than the pitch of the thread.7.1.3DV D2 Modification by adding the following:The spacings on a terminal block shall be as specified in Table 7.1.3DV. Alternately, thecreepage and clearance distances given in Tables 13 and 15 of the standards contained inTable DVB.2, Reference No.

42、 9, may be used.APRIL 27, 2018 NATIONAL DIFFERENCES FOR 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNote 1DV: For information regarding verification of clearances and creepage distances by measurement, see thestandards contained in Table

43、DVB.2, Reference No. 9, Annex G.Table 7.1.3DV D2 Add the following table:Table 7.1.3DV Minimum acceptable clearances and creepage distancesApplication Potential involved involts (rms or d.c.)Minimum clearances and creepage distances,mm, between uninsulated live parts of oppositepolarity and between

44、an uninsulated live partand a grounded part including any mountingsurfaceClearance through air Creepage over surfaceA. Service includingdead-frontswitchboards,panelboards, serviceequipment, and the like51 150 12,7 19,1151 300 19,1 31,8301 600 25,4 50,8B. Commercialappliances, includingbusiness equip

45、ment,electronic dataprocessing equipment,and the like51 150 1,6a1,6a151 300 2,4a2,4a301 600 9,5 12,7C. Industrial, general 51 150 3,2a6,4151 300 6,4 9,5301 600 9,5 12,7D. Industrial, deviceshaving limited ratingsb51 300 1,6a3,2a301 600 4,8 9,5E. Terminal blocksrated 601 1 500 V6011000 14,0 21,61 001

46、 1 500 17,8 30,5NOTES 1) A slot, groove, or similar spacing, 0,33 mm wide or less, in the contour of insulating material,shall be disregarded.2) An air space of 0,33 mm or less between a live part and an insulating surface shall bedisregarded for the purpose of measuring over surface spacings.aThe s

47、pacing between field wiring terminals of opposite polarity and the spacing between a fieldwiring terminal and a grounded dead metal part shall not be less than 6,4 mm if short-circuitingor grounding of such terminals can result from projecting strands of wire. Examples of meansthat prevent stray wir

48、e strand contact include rating the terminal block for solid wire only, anddesign features such as recessed terminal pockets.bThe clearances and creepage distances specified in item D are applicable to a terminal block foruse only in or with industrial control equipment where the load on any single

49、circuit of theterminal block does not exceed 15 amperes at 51 150 volts, 10 amperes at 151 300 volts, 5amperes at 301 600 volts, or the maximum ampere rating, whichever is less.7.1.4DV D2 Modification to add the following:Refer to standards in accordance with Table DVB.2, Reference No. 9.APRIL 27, 2018NATIONAL DIFFERENCES FOR8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.5DV D2 Addition of Clauses 7.1.5DV.1 7.1.5DV.1.8 and Table 7.1.5DV.1: (Cana