BS-EN-60947-7-2-1996.pdf

BRITISH STANDARD BS EN 60947-7-2:1996 Specification for Low-voltage switchgear and controlgear Part 7: Ancillary equipment Section 2: Protective conductor terminal blocks for copper conductors The European Standard EN 60947-7-2:1995 has the status of a British Standard ICS 29.120.60 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60947-7-2:1996 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 May 1996 © BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference PEL/17 Draft for comment 91/26062 DC ISBN 0 580 25506 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PEL/17, Switchgear, controlgear and HV-LV coordination, upon which the following bodies were represented: Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) ASTA Certification Services British Railways Board Copper Development Association Electricity Association ERA Technology Ltd. GAMBICA (BEAMA Ltd.) Health and Safety Executive Ministry of Defence Transmission and Distribution Association (BEAMA Ltd.) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Consulting Engineers Association of Control Manufacturers TACMA (BEAMA Ltd.) BEAMA Electrical Cable and Conductor Accessory Manufacturers Association Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Institution of Electrical Engineers London Underground Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60947-7-2:1996 © BSI 04-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60947-7-23 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60947-7-2:1996 ii © BSI 04-1999 National foreword This British Standard has been prepared by Technical Committee PEL/17 and is the English language version of EN 60947-7-2:1995 Low-voltage switchgear and controlgear Part 7: Ancillary equipment Section 2: Protective conductor terminal blocks for copper conductors, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 947-7-2:1995, published by the International Electrotechnical Commission (IEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard HD 383:1986 (IEC 228:1978) BS 6360:1991 Specification for conductors in insulated cables and cords EN 60439-1:1994 (IEC 439-1:1992) BS 60439 Specification for low-voltage switchgear and controlgear assemblies Part 1:1994 Specification for type-tested and partially type-tested assemblies EN 60947-7-1:1991 (IEC 947-7-1:1989) BS EN 60947 Specification for low-voltage switchgear and controlgear Part 7 Ancillary equipment Section 1:1992 Terminal blocks for copper conductors Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 60947-7-2 November 1995 ICS 29.120.60 Descriptors: Low-voltage switchgear and controlgear, ancillary equipment, protective conductor terminal blocks, copper conductors English version Low-voltage switchgear and controlgear Part 7: Ancillary equipment Section 2: Protective conductor terminal blocks for copper conductors (IEC 947-7-2:1995) Appareillage à basse tension Partie 7: Matériels accessoires Section 2: Blocs de jonction de conducteurs de protection pour conducteurs en cuivre (CEI 947-7-2:1995) Niederspannungs-Schaltgeräte Teil 7: Hilfseinrichtungen Hauptabschnitt 2: Schutzleiter-Reihenklemmen für Kupferleiter (IEC 947-7-2:1995) This European Standard was approved by CENELEC on 1995-09-20. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnishe Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1995 Copyright reserved to CENELEC members Ref. No. EN 60947-7-2:1995 E Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60947-7-2:1995 © BSI 04-1999 2 Foreword The text of document 17B/635/DIS, future edition 1 of IEC 947-7-2, prepared by SC 17B, Low-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60947-7-2 on 1995-09-20. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A and Annex ZA are normative. Annex ZA has been added by CENELEC. Contents Page Foreword2 Introduction3 1General3 1.1Scope and object3 1.2Normative references3 2Definitions3 3Classification4 4Characteristics4 4.1Summary of characteristics4 4.2Type of protective conductor terminal block4 4.3Rated and limiting values4 5Product information4 5.1Marking4 6Normal service, mounting and transport conditions4 7Constructional and performance requirements4 7.1Constructional requirements4 7.2Performance requirements5 8Tests6 8.3Verification of electrical characteristics6 8.4Fire hazard test8 Annex A (normative) Maximum short-time withstand currents allocated to the rail profile9 Annex ZA (normative) Normative references to international publications with their corresponding European publications9 Figure 1 Arrangement for the voltage drop test6 Figure 2 Arrangement for the temperature-rise test for the first test group7 Figure 3 Arrangement for the temperature-rise test for the second test group7 Figure 4 Arrangement for the thermal short-circuit test8 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1996-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1996-07-01 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60947-7-2:1995 © BSI 04-19993 Introduction The provisions of the general rules dealt with in part 1 (IEC 947-1) and the requirements for terminal blocks of part 7-1 (IEC 947-7-1) are applicable to this section of IEC 947-7 where specifically called for. Clauses and subclauses, tables, figures and appendices of part 1 or part 7-1 thus applicable are identified by reference to part 1 or part 7-1, for example subclause 1.2 of part 1, Table IV of part 7-1 or Appendix A of part 1. 1 General 1.1 Scope and object This section of IEC 947-7 applies to protective conductor terminal blocks with PE function up to 120 mm2(250 MCM) and to protective conductor terminal blocks with PEN function equal to and above 10 mm2 (AWG 8) with screw-type or screwless-type clamping units, primarily intended for industrial applications. Protective conductor terminal blocks are used to form the electrical and mechanical connection between copper conductors and the fixing support. It is applicable to protective conductor terminal blocks for the connection of round copper conductors with and without special preparation having a cross-section between 0,2 mm2 and 120 mm2 (AWG 24 and 250 MCM) applied for up to 1 000 V a.c. circuits up to 1 000 Hz and up to 1 500 V d.c. circuits, most commonly in conjunction with terminal blocks according to IEC 947-7-1. This section does not apply to: special construction protective conductors terminal which form an integral part of equipment, being dealt with in the relevant product standard; protective conductor terminals requiring the fixing of special devices to the conductors before clamping them into the terminal, for example flat push-on connectors; protective conductor terminals requiring twisting of the conductors, for example those with twisted joints; protective conductor terminals providing direct contact to the conductors by means of edges or points penetrating the insulation; protective conductor terminals which are dealt with in other particular requirements. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this section of IEC 947-7. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC 947-7 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 50 (826):1982, International Electrotechnical Vocabulary (IEV) Chapter 826: Electrical installations of buildings. IEC 228:1978, Conductors of insulated cables. IEC 439-1:1992, Low-voltage switchgear and controlgear assemblies Part 1: Type-tested and partially type-tested assemblies. IEC 715:1981, Dimensions of low-voltage switchgear and controlgear Standardized mounting on rails for mechanical support of electrical devices in switchgear and controlgear installations. IEC 947-7-1:1989, Low-voltage switchgear and controlgear Part 7: Ancillary equipment Section 1: Terminal blocks for copper conductors. 2 Definitions For the majority of the definitions required in connection with this section of IEC 947-7, see clause 2 of part 1. For the purpose of this section, the following additional definitions shall 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 or screwless-type fixing means. Supports are, for example, mounting rails, sheet metal cut-outs, mounting plates, etc. a protective conductor terminal block can be either partially insulated or not at all. It does not require any operating insulation 2.2 partially insulated protective conductor terminal block device which is only insulated against live parts of other devices but not against the support itself Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 10 07:43:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60947-7-2:1995 4 © BSI 04-1999 2.3 PEN conductor an earthed conductor combining the functions of both protective conductor and neutral conductor NOTEThe acronym PEN results from the combination of both symbols PE for the protective conductor and N for the neutral conductor IEV 826-04-06 (see also 2.1.15 of part 1). 3 Classification Distinction is made between various types of protective conductor terminal blocks according to the: method of fixing the protective conductor terminal block to the support; type of terminal (e.g. screw-type terminals, screwless-type terminals, etc.); ability to receive conductors with or without special preparation (e.g. cable lugs); terminal assemblies with identical or dissimilar clamping units; number of terminals on each terminal assembly; service conditions; PE or PEN functions. 4 Characteristics 4.1 Summary of characteristics Subclause 4.1 of part 7-1 applies. 4.2 Type of protective conductor terminal block Subclause 4.2 of part 7-1 applies. 4.3 Rated and limiting values 4.3.1 Void. 4.3.2 Rated short-time withstand current (of a protective conductor terminal block) Subclause 4.3.2 of part 7-1 applies. 4.3.3 Standard cross-section Subclause 4.3.3 of part 7-1 applies. NOTEIn accordance with the scope of this section, Table 1 of part 1 applies only up to 120 mm2(250 MCM). 4.3.4 Rated cross-section Subclause 4.3.4 of part 7-1 applies. 4.3.5 Rated connecting capacity (of a protective conductor terminal block) Subclause 4.3.5 of part 7-1 applies with the following addition to Table II. 5 Product information 5.1 Marking A protective conductor terminal block shall be marked in a durable and legible manner with: a) the name of the manufacturer or a trade mark by which the manufacturer can be readily identified; b) a type reference permitting to identify it and to get relevant information from the manufacturer or his catalogue; c) IEC 947-7-2, if the manufacturer claims compliance with this standard; Additional information The following information shall be marked on the terminal block or contained in the manufacturers data sheet or on the smallest packing unit. d) the rated cross-section; e) the rated connecting capacity if different from Table II and for one conductor per terminal as for 7.4.3.1.6 of IEC 439-1; f) service conditions if different from those of clause 6 below; g) PE function only if supplied with or intended for use only with steel in the current-carrying path. NOTENo marking indicates suitability for use in both PE + PEN functions. 6 Normal service, mounting and transport conditions Clause 6 of part 1 applies. 7 Constructional and performance requirements 7.1 Constructional requirements Subclause 7.1 of part 1 is amplified as follows: Rated cross-sectionRated connecting capacity mm2AWG/MCMmm2AWG/MCM 50025 35 504 2 0 700035 50 702 0 00 9500050 70 950 00 000 12025070 95 12000 000 250 Licensed