BS IEC 62873-3-3-2016 Residual current operated circuit-breakers for household and similar use Specific requirements for RCDs with screw-type terminals for external untreated alumir.pdf

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1、Residual current operated circuit-breakers for household and similar usePart 3-3: Specific requirements for RCDs with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductorsBS IEC 62873-3-3:2016BSI Stan

2、dards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of IEC 62873-3-3:2016.The UK participation in its preparation was entrusted by TechnicalCommittee PEL/23, Electrical accessories, to Subcommittee PEL/23/1, Circuit

3、breakers and similar equipment for household use.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Sta

4、ndards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 83057 0ICS 29.120.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 201

5、6.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS IEC 62873-3-3:2016IEC 62873-3-3 Edition 1.0 2016-09 INTERNATIONAL STANDARD Residual current operated circuit-breakers for household and similar use Part 3-3: Specific requirements for RCDs with screw-type terminals

6、for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductors INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.120.50 ISBN 978-2-8322-3615-4 Registered trademark of the International Electrotechnical Commission Warning! Make sure

7、 that you obtained this publication from an authorized distributor. BS IEC 62873-3-3:2016 2 IEC 62873-3-3:2016 IEC 2016 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references. 6 3 Terms and definitions 6 4 Classification . 7 5 Characteristics of RCDs . 7 6 Marking and other product

8、information . 7 7 Standard conditions for operation in service and for installation 8 8 Requirements for construction and operation 8 9 Tests . 9 9.1 General . 9 9.2 Test conditions 10 9.3 Current cycling test . 10 9.3.1 General . 10 9.3.2 Preparation 11 9.3.3 Test arrangement . 11 9.3.4 Temperature

9、 measurement 12 9.3.5 Test method and acceptance criteria 12 Bibliography . 17 Figure 1 General arrangement for the test 14 Figure 2 Test specimen example 1 . 15 Figure 3 Test specimen example 2 . 16 Figure 4 Test specimen example 3 . 16 Figure 5 Test specimen example 4 . 16 Figure 6 Test specimen e

10、xample 5 . 16 Table 1 Marking for terminals . 8 Table 2 Connectable cross-sections of aluminium conductors for screw-type terminals 8 Table 3 List of tests according to the material of conductors and terminals 9 Table 4 Connectable conductors and their theoretical diameters . 10 Table 5 Cross-sectio

11、ns (S) of aluminium test conductors corresponding to the rated currents 10 Table 6 Test conductor length 11 Table 7 Equalizer and busbar dimensions . 12 Table 8 Test current as a function of rated current 13 Table 9 Example of calculation for determining the average temperature deviation D . 14 BS I

12、EC 62873-3-3:2016IEC 62873-3-3:2016 IEC 2016 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS FOR HOUSEHOLD AND SIMILAR USE Part 3-3: Specific requirements for RCDs with screw-type terminals for external untreated aluminium conductors and with aluminium screw-

13、type terminals for use with copper or with aluminium 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

14、 co-operation 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 referr

15、ed to as “IEC 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 t

16、his preparation. 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 internatio

17、nal consensus 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

18、efforts are 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 Publi

19、cations transparently 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 itself does not provide any attestation of conformity.

20、Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7)

21、 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 other damage of any nature whatsoever, whether direct or indirect, or for cos

22、ts (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. Use of the referenced publications is indispensable for the correct applic

23、ation 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 rights. International Standard IEC 62873-3-3 has been prepared by subcom

24、mittee 23E: Circuit breakers and similar equipment for household use, of IEC technical committee 23: Electrical accessories. The text of this standard is based on the following documents: FDIS Report on voting 23E/966/FDIS 23E/984/RVD Full information on the voting for the approval of this standard

25、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. BS IEC 62873-3-3:2016 4 IEC 62873-3-3:2016 IEC 2016 A list of all parts of the IEC 62873 series published under the general title Residual current o

26、perated circuit-breakers for household and similar use can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific public

27、ation. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. BS IEC 62873-3-3:2016IEC 62873-3-3:2016 IEC 2016 5 INTRODUCTION This document is part of the series described in the

28、outline document IEC 62873-1. BS IEC 62873-3-3:2016 6 IEC 62873-3-3:2016 IEC 2016 RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS FOR HOUSEHOLD AND SIMILAR USE Part 3-3: Specific requirements for RCDs with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type term

29、inals for use with copper or with aluminium conductors 1 Scope This part of IEC 62873 applies to RCDs equipped with screw-type terminals of copper or of alloys containing at least 58 % of copper (if worked cold) or at least 50 % of copper (if worked otherwise), or of other metal or suitably coated m

30、etal, no less resistant to corrosion than copper and having mechanical properties no less suitable for use with untreated aluminium conductors, or with screw-type terminals of aluminium material for use with copper or aluminium conductors. This part of IEC 62873 cannot be used alone but it is intend

31、ed to be applied together with an RCD product standard (IEC 61008-1 or IEC 61009-1) if an RCD is equipped with screw-type terminals for external untreated aluminium conductors and with aluminium screw-type terminals for use with copper or with aluminium conductors. In this part of IEC 62873, copper-

32、clad and nickel-clad aluminium conductors are considered as aluminium conductors. NOTE In AT, AU and DE, the use of aluminium screw-type terminals for use with copper conductors is not allowed. In AT and DE, terminals for aluminium conductors only are not allowed; In ES, the use of aluminium conduct

33、ors is not allowed for final circuits in household and similar installations e.g. offices, shops; In DK, the minimum cross-sectional area for aluminium conductors is 16 mm2. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indis

34、pensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61008-1, Residual current operated circuit-breakers without integral overcurrent protection for household

35、and similar uses (RCCBs) Part 1: General rules IEC 61009-1, Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) Part 1: General rules IEC 62873-2, Residual current operated circuit-breakers for household and similar use Part 2: Resid

36、ual current devices (RCDs) Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 62873-2 and the following apply. BS IEC 62873-3-3:2016IEC 62873-3-3:2016 IEC 2016 7 3.1 treated conductor contact area of a conductor that has had its oxide layer o

37、n the outside strands scraped away and/or has had a compound added to improve connectability and/or prevent corrosion 3.2 untreated conductor unprepared conductor conductor which has been cut and the insulation of which has been removed for insertion into a terminal Note 1 to entry: A conductor, the

38、 shape of which is arranged for introduction into a terminal or the strands of which are twisted to consolidate the end, is considered to be an unprepared conductor. SOURCE: IEC 60050-442:1998, 442-01-26 3.3 equalizer arrangement used in the test loop to ensure an equipotentiality point and uniform

39、current density in a stranded conductor, without adversely affecting the temperature of the conductor(s) 3.4 reference conductor continuous length of the same type and size conductor as that used in the terminal unit under test and connected in the same series circuit, which enables the reference te

40、mperature and, if required, reference resistance to be determined 3.5 stability factor Sf measure of temperature stability of a terminal unit during the current cycling test 4 Classification Clause 4 of the RCD product standard applies. 5 Characteristics of RCDs Clause 5 of the RCD product standard

41、applies. 6 Marking and other product information In addition to Clause 6 of the RCD product standard, the following requirements apply. The terminal marking defined in Table 1 shall be marked on the RCD, near the terminals. The other information concerning the number of conductors, the screw torque

42、values (if different from Table 11 of the RCD product standard) and the cross-sections shall be indicated on the RCD. NOTE Tables 6, 10, 11 (in IEC 61008-1:2010) and Tables 8, 13, 14 (in IEC 61009-1:2010) have been replaced by the harmonized new numbers: 9, 10 and 11. BS IEC 62873-3-3:2016 8 IEC 628

43、73-3-3:2016 IEC 2016 Table 1 Marking for terminals Conductor types accepted Marking Copper only None Aluminium only Al Aluminium and copper Al/Cu The manufacturer shall state in his catalogue that, for the clamping of an aluminium conductor, the tightening torque shall be applied with appropriate me

44、ans. 7 Standard conditions for operation in service and for installation Clause 7 of the RCD product standard applies. 8 Requirements for construction and operation Clause 8 of the RCD product standard applies, with the following exceptions: The following text is added at the end of 8.1.5.2 of the R

45、CD product standard: For the connection of aluminium conductors, RCDs shall be provided with screw-type terminals allowing the connection of conductors having nominal cross-sections as shown in Table 2. Terminals for the connection of aluminium conductors and terminals of aluminium for the connectio

46、n of copper or aluminium conductors shall have mechanical strength adequate to withstand the tests of 9.4 of the RCD product standard, with the test conductors tightened with the torque indicated in Table 11 of the RCD product standard, or with the torque specified by the manufacturer, which shall n

47、ever be lower than that specified in Table 11 of the RCD product standard. Table 2 Connectable cross-sections of aluminium conductors for screw-type terminals Rated current aRange of nominal cross-sections bto be clamped A mm2Up to and including 25 10 Above 25 up to and including 32 10 to 16 Above 3

48、2 up to and including 50 10 to 25 Above 50 up to and including 80 10 to 35 Above 80 up to and including 100 16 to 50 Above 100 up to and including 125 25 to 70 aIt is required that, for current ratings up to and including 50 A, terminals be designed to clamp solid conductors as well as rigid strande

49、d conductors; the use of flexible conductors is permitted. Nevertheless, it is permitted that terminals for conductors having cross-sections up to 10 mm2be designed to clamp solid conductors only. bMaximum wire sizes of RCD product standard, increased according to Table D.2 of IEC 61545:1996. Compliance is checked by inspection, by measurement and by fitting in turn one conductor of the smallest and one of the largest cross-section areas as specified. BS IEC 62