1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22820-0 SANS 60947-7-2:2009Edition 3IEC 60947-7-2:2009Edition 3SOUTH AFRICAN NATIONAL STANDARD Low-voltage switchgear and controlgear Part
4、 7-2: Ancillary equipment Protective conductor terminal blocks for copper conductors This national standard is the identical implementation of IEC 60947-7-2:2009 and is adopted with the permission of the International Electrotechnical Commission. WARNING Can only be used in conjunction with SANS 609
5、47-1 and SANS 60947-7-1.Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 60947-7-2:2009 Edition 3 IEC 60947-7-2:2009 Edition 3 Table of changes Change No. Date Scope National foreword Th
6、is South African standard was approved by National Committee SABS SC 67B, Electricity distribution systems and components Low-voltage switchgear, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in Jul
7、y 2009. This SANS document supersedes SANS 60947-7-2:2003 (edition 2). IEC 60947-7-2Edition 3.0 2009-04INTERNATIONAL STANDARD NORME INTERNATIONALELow-voltage switchgear and controlgear Part 7-2: Ancillary equipment Protective conductor terminal blocks for copper conductors Appareillage basse tension
8、 Partie 7-2: Matriels accessoires Blocs de jonction de conducteur de protection pour conducteurs en cuivre INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE RICS 29.120.99; 29.130.20 PRICE CODECODE PRIXISBN 2-8318-1038-1 Registered trademark of the International El
9、ectrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale SANS 60947-7-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 2 60947-7-2 IEC:2009 CONTENTS FOREWORD.4 1 General 6 1.1 Scope6 1.2 Normative referenc
10、es 6 2 Definitions 7 3 Classification7 4 Characteristics .7 4.1 Summary of characteristics .7 4.2 Type of protective conductor terminal block.7 4.3 Rated and limiting values 8 4.3.1 Void.8 4.3.2 Short-time withstand current8 4.3.3 Standard cross-sections 8 4.3.4 Rated cross-section.8 4.3.5 Rated con
11、necting capacity.8 5 Product information 8 5.1 Marking .8 5.2 Additional information9 6 Normal service, mounting and transport conditions.9 7 Constructional and performance requirements9 7.1 Constructional requirements9 7.1.1 Clamping units.9 7.1.2 Connection of support .9 7.1.3 Clearance and creepa
12、ge distances9 7.1.4 Terminal block identification and marking 10 7.1.5 Resistance to abnormal heat and fire.10 7.1.6 Rated cross-section and rated connecting capacity .10 7.1.7 Protective conductor mounting rails .10 7.2 Performance requirements 10 7.2.1 Temperature rise .10 7.2.2 Dielectric propert
13、ies.10 7.2.3 Short-time withstand current10 7.2.4 Voltage drop10 7.2.5 Electrical performance after ageing (for screwless-type protective conductor terminal blocks only) .11 7.3 Electromagnetic compatibility (EMC) .11 8 Tests 11 8.1 Kinds of test 11 8.2 General .11 8.3 Verification of mechanical cha
14、racteristics 11 8.4 Verification of electrical characteristics11 8.4.1 General .11 8.4.2 Void.12 8.4.3 Dielectric tests.12 8.4.4 Verification of the voltage drop 13 8.4.5 Temperature-rise test 14 SANS 60947-7-2:2009This s tandard may only be used and printed by approved subscription and freemailing
15、clients of the SABS .60947-7-2 IEC:2009 3 8.4.6 Short-time withstand current test .15 8.4.7 Ageing test (for screwless-type terminal blocks only).16 8.5 Verification of thermal characteristics 17 8.6 Verification of EMC characteristics 17 Annex A (normative) Maximum short-time withstand currents all
16、ocated to the rail profile and thermal rated current of a PEN busbar .18 Figure 1 Arrangement for the dielectric test .12 Figure 2 Arrangement for the voltage drop test 13 Figure 3 Arrangement for the temperature-rise test for test group a) 15 Figure 4 Arrangement for the temperature-rise test for t
17、est group b) 15 Figure 5 Arrangement for the thermal short-time withstand current test16 Table 1 Relationship between rated cross-section and rated connecting capacity of protective conductor terminal blocks .8 Table A.1 Maximum short-time withstand currents allocated to the rail profile and thermal
18、 rated current of a PEN busbar18 SANS 60947-7-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 4 60947-7-2 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR Part 7-2: Ancillary equipment Protect
19、ive conductor terminal blocks for copper conductors FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operatio
20、n on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IE
21、C Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparat
22、ion. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensu
23、s of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are
24、made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications tran
25、sparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot b
26、e rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and member
27、s of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or
28、any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may
29、 be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60947-7-2 has been prepared by subcommittee 17B: Low-voltage switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear. This third
30、 edition of IEC 60947-7-2 cancels and replaces the second edition, published in 2002, and constitutes a technical revision. The main technical modifications of this standard since this previous publication are listed below: requirements for tightening torques for the tests improved and referenced to
31、 Table 4 of IEC 60947-1, Annex B deleted; the wording of the short-time withstand current test improved in 8.4.6. SANS 60947-7-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60947-7-2 IEC:2009 5 This standard shall be read in conjuncti
32、on with IEC 60947-1 and IEC 60947-7-1. The provisions of the general rules dealt with in IEC 60947-1 and the requirements for terminal blocks of IEC 60947-7-1 are applicable to this standard, where specifically called for. Clauses and subclauses, tables, figures and annexes thus applicable are ident
33、ified by reference to IEC 60947-1 or IEC 60947-7-1, e.g. 1.2 of IEC 60947-1, Table 4 of IEC 60947-7-1 or Annex A of IEC 60947-1. The text of this standard is based on the following documents: FDIS Report on voting 17B/1655/FDIS 17B/1669/RVD Full information on the voting for the approval of this sta
34、ndard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 60947 series, under the general title Low-voltage switchgear and controlgear, can be found on the IEC websi
35、te. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, repla
36、ced by a revised edition, or amended. SANS 60947-7-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 6 60947-7-2 IEC:2009 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR Part 7-2: Ancillary equipment Protective conductor terminal blocks for coppe
37、r conductors 1 General 1.1 Scope This part of IEC 60947 specifies requirements for protective conductor terminal blocks with PE function up to 120 mm2(250 kcmil) and for protective conductor terminal blocks with PEN function equal to and above 10 mm2(AWG 8) with screw-type or screwless-type clamping
38、 units, primarily intended for industrial applications. NOTE AWG is the abbreviation of “American Wire Gage” Gage (US) = Gauge (UK) kcmil = 1 000 cmil 1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil 1 mil = 1/1 000 inch Protective conductor terminal blocks are used to form t
39、he electrical and mechanical connection between copper conductors and the fixing support. lt is applicable to protective conductor terminal blocks for the connection of round copper conductors with or without special preparation having a cross-section between 0,2 mm2and 120 mm2(AWG 24 and 250 kcmil)
40、, intended to be used in circuits of a rated voltage not exceeding 1 000 V a.c. up to 1 000 Hz or 1 500 V d.c., most commonly in conjunction with terminal blocks according to IEC 60947-7-1. This standard may be used as guide for protective conductor terminal blocks requiring the fixing of special de
41、vices to the conductors, for example quick connect terminations or wrapped connections, etc.; protective conductor terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, etc. Where applicable
42、 in this standard, the term “clamping unit” has been used instead of the term “terminal”. This is taken into account in case of reference to IEC 60947-1. 1.2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the
43、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60439-1:1999, Low-voltage switchgear and controlgear assemblies Part 1: Type-tested and partially type-tested assemblies Amendment 1 (2004) IEC 60715:1981, Dimensions
44、 of Iow-voltage switchgear and controlgear Standardized mounting on rails for mechanical support of electrical devices in switchgear and controlgear installations Amendment 1 (1995) IEC 60947-1:2007, Low-voltage switchgear and controlgear Part 1: General rules SANS 60947-7-2:2009This s tandard may o
45、nly be used and printed by approved subscription and freemailing clients of the SABS .60947-7-2 IEC:2009 7 IEC 60947-7-1, Low-voltage switchgear and controlgear Part 7-1: Ancillary equipment Terminal blocks for copper conductors 2 Definitions For the purposes of this document, definitions given in I
46、EC 60947-7-1, together with the following definitions, apply. 2.1 protective conductor terminal block device with one or more clamping units for connecting and/or joining protective conductors (PE and PEN conductors) with conducting connection to their supports, which may be designed with screw-type
47、 or screwless-type fixing means NOTE 1 Supports are, for example, mounting rails, sheet metal cut-outs, mounting plates, etc. NOTE 2 A protective conductor terminal block can be either partially insulated or not at all. lt does not require any functional insulation. 2.2 partially insulated protectiv
48、e conductor terminal block device which is only insulated against live parts of other devices but not against the support itself 2.3 PEN conductor earthed conductor combining the functions of both protective conductor and neutral conductor NOTE The acronym PEN results from the combination of both sy
49、mbols PE for the protective conductor and N for the neutral conductor (see 2.1.15 of IEC 60947-1). 3 Classification Distinction is made between various types of protective conductor terminal blocks as follows: method of fixing the protective conductor terminal block to the support; type of clamping units: screw-type clamping units or screwless-type clamping units; ability to receive conductors with or without special preparation (e.g. cable lugs); terminal assemblies
