BS-7697-1993.pdf

BRITISH STANDARD BS 7697:1993 Incorporating Corrigendum No. 1 Nominal voltages for low voltage public electricity supply systems (Implementation of HD 472 S1) ICS 29.020; 29.240.01 ? BS 7697:1993 This British Standard, having been prepared under the direction of the General Electrotechnical Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1993 © BSI 7 January 2003 The following BSI references relate to the work on this standard: Committee reference GEL/- Draft announced in BSI News August 1993 ISBN 0 580 22571 2 Committees responsible for this British Standard The preparation of this British Standard was under the direction of the General Electrotechnical Standards Policy Committee (GEL/-) upon which the following bodies were represented: Association of Control Manufacturers (TACMA) BEAMA Ltd. BEAMA Ltd. British Radio nominal voltage English version Nominal voltages for low voltage public electricity supply systems (includes amendment A1:1995) Tensions nominales des réseaux électriques de distribution publique basse tension (inclut lamendement A1:1995) Nennspannungen für öffentliche Niederspannungs-Stromverteilungs-systeme (enthält Änderung A1:1995) This Harmonization Document was approved by CENELEC on 1988-11-04. Amendement A1 was approved by CENELEC on 1995-03-24. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning such national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). 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. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1988 Copyright reserved to CENELEC members Ref. No. HD 472 S1:1988 + A1:1995 E BS 7697:1993 © BSI 7 January 2003 2 Foreword The Harmonization Document consists of: a text elaborated from the IEC Publication 38 (6th edition) in agreement with UNIPEDE (International Union of Procedures and Distributors of Electrical Energy). This Harmonization Document was approved by CENELEC on 1988-11-04. According to the CENELEC Internal Regulations the CENELEC member National Committees are bound: to announce the existence of this Harmonization Document at national level by or before 1989-06-01; to publish their new harmonized national standard by or before 1989-12-01; to withdraw all conflicting national standards by or before 1989-12-01. Harmonized national standards are listed on the HD information sheet, which is available from the CENELEC National Committees or from the CENELEC Central Secretariat. Foreword to amendment A1 At the request of the British electrotechnical committee, a draft for an amendment to HD 472 S1:1988 was submitted to the CENELEC members for acceptance in January 1995. The text of the draft was accepted by CENELEC as amendment A1 to HD 472 S1:1988 on 1995-07-04. The following dates were fixed: Contents Page Foreword2 1Scope3 2Definitions3 3Standard values of nominal voltage3 Figure 1 Timescale for reduction of voltage in low-voltage public electricity supply in the UK4 latest date by which the existence of the amendment has to be announced at national level (doa) 1995-10-15 latest date by which the amendment has to be implemented at national level by publication of harmonized national standard or by endorsement(dop) 1996-01-15 BS 7697:1993 © BSI 7 January 2003 3 1 Scope This standard applies to a.c. three-phase, three-wire or four-wire, public supply systems, having a nominal voltage between 100 V and 1 000 V inclusive, and to the equipment connected to these systems. This standard is not applicable to standard voltages of components and parts used within electrical devices or items of equipment. 2 Definitions NOTEThe voltages stated below are r.m.s, values. 2.1 nominal voltage voltage by which a system or equipment is designated and to which certain operating characteristics are referred 2.2 supply terminals the point of delivery of electricity from the distribution system of the electricity supply authority to the consumer 3 Standard values of nominal voltage The standard values of nominal voltage are: 230 V between phases for three-wire three-phase systems; 230 V between phase and neutral, and 400 V between phases, for four-wire three-phase systems. Under normal system conditions it is recommended that the voltage at the supply terminals should not differ from the nominal voltage by more than ±10 %. The nominal voltage of existing 220/380 V and 240/415 V systems shall evolve towards the standardized value of 230/400 V. The transition period should be as short as possible and should not exceed the year 2008. During this period, as a first step, the electricity supply authorities of countries having 220/380 V systems should bring the voltage within the range 230/400 V %, and those of countries having 240/415 V systems should bring the voltage within the range 230/400 V %. At the end of this transition period the tolerance of 230/400 V ? 10 %. should have been achieved. After this, the reduction of this range will be considered. NOTEThe deadline for the completion of the first step is envisaged for 1995. +6 10 +10 6 BS 7697:1993 4© BSI 7 January 2003 National annex NA (informative) Annex deleted National annex NB (informative) CENELEC Memorandum No. 14 The recommended marking of the rated voltages of electrical equipment HD 472 S1 on “Nominal voltages for low voltage public electricity supply systems” introduces the harmonized standard values of nominal voltages of: 230 V between phases for three-wire three-phase systems; 230 V between phase and neutral and 400 V between phases for four-wire three-phase systems. The present values of the nominal voltage will evolve gradually to the above mentioned values, the transitional period should not exceed in any case the year 2003. In order to create a uniform situation in EC and EFTA countries, CENELEC recommends that from 1st January 1993 at the latest the manufacturers mark the equipment with the rated voltage 230 V or 400 V or with a rated voltage range including these values, as appropriate. Such marking may already be used before that date. National annex NC (informative) Timescale for reduction of voltage The timescale for the reduction in voltage of the low-voltage public electricity supply in the UK is shown in Figure 1. The actual dates of changes of voltage are 1 January 1995 and 1 January 2003 (see national foreword). Figure 1 Timescale for reduction of voltage in low-voltage public electricity supply in the UK blank BS 7697:1993 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-global.com. Standards are also available from the BSI website at http:/www.bsi-global.com. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-global.com. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-global.com. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi-global.com/bsonline. Further information about BSI is available on the BSI website at http:/www.bsi-global.com. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-global.com.