UL 60947-7-2 (ND)-2011 National Differences For UL 60947-7-2 Low-Voltage Switchgear and Controlgear - Part 7-2 Ancillary Equipment - Protective Conductor Terminal Blocks for Copper.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60947-7-2Low-Voltage Switchgear and Controlgear - Part 7-2: Ancillary Equipment - Protective ConductorTerminal Blocks for Copper ConductorsUL COPYRIGHTED MATERIAL NOT A

2、UTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences ForUL 60947-7-2Low-Voltage Switchgear and Controlgear - Part 7-2: Ancillary Equipment - Protective ConductorTerminal Blocks for Copper ConductorsEdition: 3Edition Date: May 6, 2011This revision of ANSI/U

3、L 60947-7-2 is to add the ANSI approval date to the title page. Thisstandard is a bi-national IEC-based standard that is harmonized for Mexico and the UnitedStates, and co-published by both standards development organizations (ANCE and UL).This document provides a single listing of the National Diff

4、erences included 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

5、 provides this standards 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,i

6、ncluding loss of 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 ex

7、ceed the pricepaid 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 fe

8、es) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on the purchasers computer system.Copyright Underwriters Laboratories Inc.OCTOBER 14, 2011NATIONAL DIFFERENCES FOR UL UL 60947-7-22UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORD

9、ISTRIBUTION WITHOUT PERMISSION 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 typ

10、es are additionally noted in 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 base

11、d on safety practices. These 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 particularcom

12、ponent standard is harmonized 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. Typicall

13、y one of thefollowing words is 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

14、IEC text.Deletion / Delete - 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 theaddition, replacement or deletion of certain w

15、ords or the replacement of an entire clause,subclause, table, figure, or annex of the base IEC text.OCTOBER 14, 2011 NATIONAL DIFFERENCES FOR UL UL 60947-7-2 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNational Differences1.1DV.1 D2 Modif

16、ication by adding the following:AWG range expanded to include AWG 30.1.1DV.2 D2 Modification by adding the following:This standard applies to insulation displacement terminals.1.1DV.3 DR Modification by adding the following:PEN does not apply.1.1DV.4 D2 Modification by adding the following:This stan

17、dard also applies to terminal blocks that have insulation piercing or displacementclamping units.2.2DV D2 Modification by adding the following:It is mechanically and electrically attached to its support, path 2-2 in Figure 5. It may ormay not have path 1-1.2.3DV DR Delete Clause 2.3:This definition

18、does not apply.3DV.1 D2 Modification by adding the following:application: commercial and industrial, or service3DV.2 DR Modification by adding the following:PEN does not apply.4.3.2DV D2 Modification by adding the following:A protective conductor terminal block, classified for use as an unprotected

19、circuit, shall besubjected to the Short-time withstand current test for Service Applications.4.3.5DV.1 D2 Modification of 4.3.5:Subclause 4.3.5 of IEC 60947-7-1 applies.4.3.5DV.2 D2 Delete Table 1:This table does not apply.OCTOBER 14, 2011NATIONAL DIFFERENCES FOR UL UL 60947-7-24UL COPYRIGHTED MATER

20、IAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.1DV.1 D2 Add the following to Clause 5.1:c) A protective conductor terminal block, not complying with 7.1.4, shall bemarked with the symbol in Figure 6DV or with ”G”, “GR”, “GND”, “Ground”,“Grounding”, or equivale

21、nt marking.5.1DV.2 D2 Addition of Figure 6DV:This is generated text for figtxt.5.2DV.1 DE Deletion of item a).5.2DV.2 DE Modification of item c):c) the rated connecting capacity;5.2DV.3 D2 Modification of Note:NOTE: No marking indicates suitability for use in PE function.5.2DV.4 D2 Modification by a

22、dding the following:The information in Subclause 5.2 of Annex C, item 1 shall be stated by the manufacturer,except for rated operational voltage, rated current, rated insulation voltage, and ratedimpulse withstand voltage.Figure 6DVGrounding symbolOCTOBER 14, 2011 NATIONAL DIFFERENCES FOR UL UL 6094

23、7-7-2 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.1DV D2 Modification of fourth paragraph:Compliance is checked by inspection, by the test of 8.3.4.1, and by the tests of 8.3.4.2 and8.3.4.3 of Annex C, item 1.7.1.2DV.1 D2 Addition:The

24、 protective earthing connection of a protective conductor terminal block to its supportshall be made independently or simultaneously with its fixation to the support.7.1.3DV D2 Modification:Subclause 7.1.3 of Annex C, item 1, applies.7.1.4DV.1 D2 Addition of NOTE to 7.1.4:Note: A green colored screw

25、 head alone does not meet the intent of this requirement.7.2.3DV DE Modification of heading for 7.2.3 for commercial and industrial use:Rated short-time withstand current (Commercial and Industrial)7.2.3DV.1 D2 Addition of performance requirement to 7.2 for service use:Rated short-time withstand cur

26、rent (Service)A protective conductor terminal block, intended for use in service applications, shall becapable of withstanding a single application of the current specified in Subclause 7.2.3, forthe time specified in Table 7.2.3DV, without damage to the terminal block or its support. Atthe conclusi

27、on of the test, continuity shall exist when tested as described in 8.4.6DV.4.2.Table 7.2.3DV.1 D2 Add the following table:Table 7.2.3DVRated short-time withstand current test duration (Service)Conductor size AWG/kcmil mm2Time, seconds14 2.1 412 3.3 410 5.3 48 8.4 46 13.3 64 21.2 63 26.7 62 33.6 61 4

28、2.4 61/0 and larger 53.5 9Table 8.2DV D2 Add the following table:OCTOBER 14, 2011NATIONAL DIFFERENCES FOR UL UL 60947-7-26UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 8.2DVTest SequenceSequence Number Quantity Test Referenced Clause1

29、2 of 5 Verification of Mechanical Characteristics 8.32 2 of 5 Mechanical properties of clamping units 8.3.3.1Verification of voltage dropa8.4.4Mechanical properties of attachment to support 8.3.3.1Verification of voltage dropa8.4.43 2 Verification of clearances and creepagedistances8.4.24 3 of 5 Die

30、lectric tests 8.4.3Dielectric tests for insulation displacementterminals8.4.3DV5 5 Temperature rise sequenceVerification of the voltage dropa8.4.4Temperature rise test 8.4.5Verification of the voltage dropa8.4.46 1 Short time withstand current sequenceVerification of the voltage drop 8.4.4Short time

31、 withstand current test (Commercialand Industrial Application)8.4.6DV.1Verification of the voltage drop 8.4.46A 1 Short time current sequence (ServiceApplications)8.4.6DV.4Current Test 8.4.6DV.4.1Continuity Test 8.4.6DV.4.27 5 Aging test sequenceVerification of the voltage dropa8.4.4Aging test for p

32、rotective conductor terminalblocks with screwless type clamping units8.4.7Verification of the voltage dropa8.4.47A 2 Aging test for protective conductor terminalblocks with insulation displacement typeclamping units8.4.7DV.18 1 of 3 Verification of thermal characteristicsa8.5aNot required in the US.

33、8.4.3DV D2 Modification by adding the following:Insulation displacement terminals shall be conditioned according to Subclause 8.4DV.1.1of Annex C, item 1, prior to the dielectric test.8.4.6DV.1 DE Modification of heading for 8.4.6:Short-time withstand current test (Commercial and Industrial Applicat

34、ion)8.4.6DV.2 D2 Modification by adding the following:The tests shall be repeated for each alternate support construction, support material, orboth.OCTOBER 14, 2011 NATIONAL DIFFERENCES FOR UL UL 60947-7-2 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMIS

35、SION FROM UL8.4.6DV.3 D2 Modification by adding the following:A copper conductor of the largest size for which the terminal block is rated, not less than0.6 m long, is to be installed.8.4.6DV.4 D2 Add the following to 8.4.6:Short Time Current Sequence (Service Applications)8.4.6DV.4.1 Current testA

36、copper conductor of the rated cross-section, not less than 0.6 m long, shall be installed.The tightening torque shall be in accordance with the manufacturers instructions or, in theabsence of such instructions, in accordance with table 4 of Annex C, item 2. The testcurrent is to be passed through th

37、e mounting support and the conductor in series, throughpath 2-2 in accordance with Figure 5.8.4.6DV.4.2 Continuity testAfter the current test described in 8.4.6DV.4.1, continuity shall exist on the test sampleassembly when measured between a point on the mounting support 6.4 mm from theconnection an

38、d a similar point on the conductor. An indicating device such as anohmmeter, battery-and-buzzer combination, or similar device shall be used to determine ifcontinuity exists.8.4.7DV D2 Modification:8.4.7DV.1 Requirements for the Ageing Test for Insulation displacement terminal blocksare covered by the Current Cycling tests in Annex C, item 1.8.7DV D2 Addition of Thermoplastic Insulation Stress Relief Test:Subclause 8.7DV of Annex C, item 1, UL 60947-7-1 applies.OCTOBER 14, 2011NATIONAL DIFFERENCES FOR UL UL 60947-7-28