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 978-0-626-22821-7 SANS 60947-7-3:2009Edition 2IEC 60947-7-3:2009Edition 2SOUTH AFRICAN NATIONAL STANDARD Low-voltage switchgear and controlgear Part
4、 7-3: Ancillary equipment Safety requirements for fuse terminal blocks This national standard is the identical implementation of IEC 60947-7-3:2009 and is adopted with the permission of the International Electrotechnical Commission. WARNING Can only be used in conjunction with SANS 60947-1 and SANS
5、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 60947-7-3:2009 Edition 2 IEC 60947-7-3:2009 Edition 2 Table of changes Change No. Date Scope National foreword This South Afric
6、an 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 July 2009. This S
7、ANS document supersedes SANS 60947-7-3:2003 (edition 1 as modified by IEC corr.1:2003). IEC 60947-7-3Edition 2.0 2009-04INTERNATIONAL STANDARD NORME INTERNATIONALELow-voltage switchgear and controlgear Part 7-3: Ancillary equipment Safety requirements for fuse terminal blocks Appareillage basse tens
8、ion Partie 7-3: Matriels accessoires Exigences de scurit pour les blocs de jonction fusible INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE WICS 29.120.99; 29.130.20 PRICE CODECODE PRIXISBN 2-8318-1038-7 Registered trademark of the International Electrotechnical
9、Commission Marque dpose de la Commission Electrotechnique Internationale SANS 60947-7-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 2 60947-7-3 IEC:2009 CONTENTS FOREWORD.4 INTRODUCTION.6 1 General 7 1.1 Scope7 1.2 Normative referenc
10、es 7 2 Definitions 8 3 Classification9 4 Characteristics .9 4.1 Fuse-links .9 4.2 Rated power dissipation value.9 4.2.1 Overload and short-circuit protection (PV)9 4.2.2 Exclusive short-circuit protection (PVK)9 4.3 Rated and limiting values 9 4.3.1 Rated voltages 9 4.3.2 Void.9 4.3.3 Standard cross
11、-sections 9 4.3.4 Rated cross-section.9 4.3.5 Rated connecting capacity.9 4.3.6 Working voltage.10 5 Product information 10 5.1 Marking .10 5.2 Additional information10 5.3 Marking on the packing unit.10 6 Normal service, mounting and transport conditions.11 6.1.1 Ambient temperature .11 7 Construct
12、ional and performance requirements11 7.1 Constructional requirements11 7.1.1 Clamping units 11 7.1.2 Mounting .11 7.1.3 Clearances and creepage distances 11 7.1.4 Terminal identification and marking .12 7.1.5 Void.12 7.1.6 Rated cross-section and rated connecting capacity .12 7.1.7 Void.12 7.1.8 Act
13、uating conditions 12 7.2 Performance requirements 12 7.2.1 Mechanical requirements during actuation.12 7.2.2 Electrical requirements12 7.2.3 Thermal requirements13 7.3 Electromagnetic compatibility (EMC) .13 8 Tests13 8.1 Kinds of test 13 8.2 General .13 8.3 Verification of mechanical characteristic
14、s 13 8.3.1 General .13 8.3.2 Attachment of the fuse terminal block on its support14 SANS 60947-7-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60947-7-3 IEC:2009 3 8.3.3 Mechanical properties of clamping units of a fuse terminal block
15、 .14 8.3.4 Compatibility between fuse terminal blocks and the fuse-link.14 8.3.5 Mechanical strength of the connection between the terminal block base and the fuse-carrier15 8.4 Verification of electrical characteristics15 8.4.1 General .15 8.4.2 Void.16 8.4.3 Dielectric tests.16 8.4.4 Contact resis
16、tance.17 8.4.5 Temperature rise of clamping units18 8.4.6 Void.18 8.4.7 Ageing test (for screwless-type fuse terminal blocks only) .18 8.5 Verification of thermal characteristics19 8.5.1 General .19 8.5.2 Rated power dissipation 20 8.5.3 Durability.24 8.5.4 Needle flame test 24 8.6 Verification of E
17、MC characteristics 26 Annex A (normative) Gauges .27 Annex B (informative) Power dissipation values PVand PVK28 Annex C (normative) Order of tests and number of specimens.36 Bibliography37 Figure 1 Test arrangement for the verification of the contact resistance.17 Figure 2 Test arrangement for separ
18、ate arrangement 20 Figure 3 Test arrangement for compound arrangement21 Figure 4 Test arrangement for compound arrangement of short-circuit protection 22 Figure 5 Test arrangement for the needle flame test 25 Figure 6 Point of test flame contact (view from the layer placed below the fuse terminal bl
19、ock)25 Figure A.1 Outline of the gauges27 Figure B.1 Derating curve in the case of exclusive short-circuit protection for a separate arrangement.30 Figure B.2 Derating curve in the case of exclusive short-circuit protection for a compound arrangement 31 Figure B.3 Derating curve in the case of overl
20、oad and short-circuit protection for a separate arrangement.33 Figure B.4 Derating curve in the case of overload and short-circuit protection for a compound arrangement 34 Table 1 Test forces 14 Table 2 Dummy fuse-links23 Table A.1 Dimensions and materials for gauges for fuse-links according to IEC
21、60127-2 .27 Table B.1 Results of derating curves in the case of exclusive short-circuit protection.32 Table B.2 Results of derating curves in case of overload and short-circuit protection35 Table C.1 Order of tests and number of specimens36 SANS 60947-7-3:2009This s tandard may only be used and prin
22、ted by approved subscription and freemailing clients of the SABS . 4 60947-7-3 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR Part 7-3: Ancillary equipment Safety requirements for fuse terminal blocks FOREWORD 1) The International Electrotechnical Commiss
23、ion (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
24、addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee int
25、erested 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 preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance
26、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 consensus of opinion on the relevant subjects since each technical committee has representation from all intereste
27、d 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 made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible
28、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 transparently to the maximum extent possible in their national and regional publications. Any divergence betwe
29、en 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 be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All user
30、s 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 members of its technical committees and IEC National Committees for any personal injury, property damage or othe
31、r 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 any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. U
32、se 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 be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent
33、 rights. International Standard IEC 60947-7-3 has been prepared by subcommittee 17B: Low-voltage switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear. This second edition of IEC 60947-7-3 cancels and replaces the first edition, published in 2002, and constitutes a te
34、chnical revision. The main technical modifications of this standard since this previous publication are listed below: requirements regarding clearances and creepage distances replaced by reference to Annex H of IEC 60947-1; requirements for the test of the mechanical strength of the clamping units i
35、mproved in 8.3.3.1; requirements for tightening torques for the tests improved and referenced to Table 4 of IEC 60947-1; SANS 60947-7-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60947-7-3 IEC:2009 5 requirements for the resistance a
36、nd the dimensions of dummy fuse-links specified in 8.5.2.5. This standard shall be read in conjunction 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 sp
37、ecifically called for. Clauses and subclauses, tables, figures and annexes thus applicable are identified 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 Rep
38、ort on voting 17B/1657/FDIS 17B/1671/RVD Full information on the voting for the approval of this standard 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 s
39、eries, under the general title Low-voltage switchgear and controlgear, can be found on the IEC website. 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 rela
40、ted to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. SANS 60947-7-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS . 6 60947-7-3 IEC:2009 INTRODUCTION Th
41、e standard for fuse terminal blocks covers not only the terminal block requirements but also takes into account the specifications of the cartridge fuse-links according to IEC 60127-1 and IEC 60127-2. A connection between these two standards is made by adding (adapting) the fundamental specification
42、s of cartridge fuse-links (rated current, rated voltage, maximum voltage drop and maximum sustained power dissipation for cartridge fuse-links with the dimension of 5 mm 20 mm or 6,3 mm 32 mm with their different response characteristics) to the IEC 60947-7-1 requirements for terminal blocks. By thi
43、s means, it is possible to judge the quality of the product “fuse terminal blocks”. An important fact when using such cartridge fuse-links with fuse terminal blocks is that fuses heat up much less under rated load than they would do under overload conditions. The rated load is the result of rated cu
44、rrent and maximum voltage drop. But there is a considerably increased power dissipation under overload conditions, equalling the maximum sustained power dissipation loss according to IEC 60127-2. In industrial applications, single fuse terminal blocks are used within an arrangement of terminal block
45、s or many of them forming an arrangement on their own. This means that the same current and fuse-link will result in different heat emissions. Furthermore, it should be taken into account that apart from the general full range fuse (for overload and short-circuit protection), some fuse terminal bloc
46、ks are exclusively used for short-circuit protection according to IEC 60364-4-43, e.g. in control circuits, where no overloads occur (i.e. safety coils, indicator lights or similar equipment). Consequently there are four different types of application that need to be described in the catalogue or in
47、dicated on the fuse terminal block. For more information, see Annex B. SANS 60947-7-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .60947-7-3 IEC:2009 7 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR Part 7-3: Ancillary equipment Safety require
48、ments for fuse terminal blocks 1 General 1.1 Scope This part of IEC 60947 applies to fuse terminal blocks with screw-type or screwless-type clamping units for the connection of rigid (solid or stranded) or flexible copper conductors for the reception of cartridge fuse-links in accordance with IEC 60
49、127-2, intended primarily for industrial or similar use in circuits not exceeding 1 000 V a.c., up to 1 000 Hz or 1 500 V d.c., and having a maximum short-circuit breaking capacity of 1 500 A. They are intended for installation in electrical equipment with enclosures which surround the fuse terminal blocks to such an extent that they are accessible only with the aid of a tool. For certain applications, for example in control circuits, the fuse terminal blocks
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