BS EN 619B3S6E-1N:26011903+6A-11::22001104 IncInocrpoorproartaintigngcocrorrigrigenenddaaMMaarcrchh2200111, ,MMaarcrhch22001122ananddFeFebbruruaarryy22001133 BSI Standards Publication Power installations exceeding kV a.c Part 1: Common rules BS EN 61936-1:2010+A1:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 61936‑1:2010+A1:2014, incorporating CENELEC corrigenda March 2011, March 2012 and February 2013 It is derived from IEC 61936‑1:2010, incorporating IEC corrigendum March 2011 and amendment 1:2014 It supersedes BS EN 61936-1:2010, which is withdrawn The start and finish of text introduced or altered by corrigendum is indicated in the text by tags Text altered by IEC corrigendum March 2011 is indicated in the text by The CENELEC common modifications have been implemented at the appropriate places in the text The start and finish of each common modification is indicated in the text by tags The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to IEC text carry the number of the IEC amendment For example, text altered by IEC amendment is indicated by CENELEC corrigendum March 2011 adds correct DOR, DOP and DOW values to the EN Foreword CENELEC corrigendum March 2012 adds special national conditions for Iceland to Annex ZA CENELEC corrigendum February 2013 adds further special national conditions for Iceland to Annex ZA The UK participation in the preparation of EN 61936-1:2010 was entrusted to Technical Committee PEL/99, Erection and operation of power installations Preparation of this national foreword was entrusted to PEL/99 with assistance from Technical Committee GEL/600, Earthing A list of organizations represented on these committees can be obtained on request to their secretaries NOTE To ensure wide participation in the process, GEL/600, in particular, has strengthened its membership to include more representation from the UK Electricity Supply industry (TSOs and DNOs) and an earth test equipment manufacturer Furthermore, detailed consultation has been carried out with The Energy Networks Association (ENA) through its Earthing Co-ordination Group Background and developments to IEC/CENELEC documents In recent years, two documents have existed side-by-side covering, among other things, the earthing of high voltage installations The first was HD 637 S1, Power installations exceeding 1kV, published in 1999 while the other was IEC 61936-1, of the same title, published in 2002 These documents were produced by working groups of the committees CENELEC TC/99X and IEC TC/99, respectively As these documents were not published at the same time and the composition of the working groups was to some extent different, a situation arose such that significant discrepancies existed between these two documents, notably, concerning the fundamental safety criterion of allowable human body current and body impedance values under step and touch voltage conditions This situation was not ideal, and an initiative was taken to develop a revision to IEC 61936-1 under maintenance team IEC TC/99 MT4 and to release it as a European standard At the same time, a working group CENELEC TC/99X WG1 was formed to extract the earthing content of HD 637 S1 and bring to publication a new European standard on earthing (EN 50522) Parallel voting of EN 61936-1 BRITISH STANDARD BS EN 61936-1:2010+A1:2014 and EN 50522 was arranged, in order to achieve harmonization of the adopted electrocution safety criteria and both documents were published in 2010 Differences in the UK approach to earthing design The differences in the UK approach to earthing are covered in the National Annexes of BS EN 50522 and relate to: 1) Recognition of the probabilistic nature of electrical system safety A new additional approach to earthing system design, based on probabilistic methods, is outlined and developed in the National Annexes to BS EN 50522 2) Deviations of UK safety limits compared to IEC/CENELEC limits As a result of advice obtained from the UK Health and Safety Executive (HSE), consensus was reached between PEL/99 and GEL/600 that UK HV earthing systems have to be designed according to tolerable voltages based on body impedances not exceeded for 5% of the population, as given in DD IEC/TS 60479-1:2005, Table (Column 2) rather than the 50% values (Column 3) The UK obtained a variation to the new CENELEC and IEC standards which has been recognized in the foreword of BS EN 61936-1:2010 and BS EN 50522:2010, Annex Q (A-Deviations) Hence, these documents specify the required difference in approach to earthing design in the UK, based on the % body impedance values The new UK tolerable touch voltage figures are given in BS EN 50522, National Annex NA 3) Additional guidance on assessing fault current distribution, earth potential rise, design and testing of earthing systems 4) Recognition of the use of computer-aided earthing design tools This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 81261 ICS 29.020; 29.080.01 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2012 Amendments/corrigenda issued since publication Date Text affected 31 January 2014 Implementation of CEN correction notice January 2014: Title revised Implementation of IEC amendment 1:2014 with CENELEC endorsement A1:2014 Annex ZC amended This page deliberately left blank EUROPEAN STANDARD EN 61936-1:2010+A1 NORME EUROPÉENNE EUROPÄISCHE NORM ANporvile2m01b4er 2010 ICS 29.020 29.080.01 Incorporating corrigendum February 2013 English version Power installations exceeding kV a.c - Part 1: Common rules (IEC 61936-1:2010, modified) Installations électriques en courant Starkstromanlagen mit alternatif de puissance supérieure kV - Nennwechselspannungen über kV - Partie 1: Règles communes Teil 1: Allgemeine Bestimmungen (CEI 61936-1:2010, modifiée) (IEC 61936-1:2010, modifiziert) This European Standard was approved by CENELEC on 2010-11-01 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, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 61936-1:2010 E BS EN 61936-1:2010+A1:2014 –2– EBNS6E1N93661-19:32601-10:+2A011:02014 (E) EN 61936-1:2010 (E) - - Foreword The text of document 99/95/FDIS, future edition of IEC 61936-1, prepared by IEC TC 99, System engineering and erection of electrical power installations in systems with nominal voltages above kV a.c and 1,5 kV d.c., particularly concerning safety aspects, was submitted to the IEC-CENELEC parallel vote A draft amendment was prepared by the Technical Committee CENELEC TC 99X, Power installations exceeding kV a.c (1,5 kV d.c.) and was submitted to formal vote The combined texts were approved by CENELEC as EN 61936-1 on 2010-11-01 This European Standard partially supersedes HD 637 S1:1999 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN and CENELEC shall not be held responsible for identifying any or all such patent rights The following dates were fixed: – latest date by which the EN has to be implemented (dop) 2011-11-01 at national level by publication of an identical national standard or by endorsement – latest date by which the national standards conflicting (dow) 2013-11-01 with the EN have to be withdrawn Annexes ZA, ZB and ZC have been added by CENELEC BS EN 61936-1:2010 EN 61936-1:2010 (E) - - Endorsement notice The text of the International Standard IEC 61936-1:2010 was approved by CENELEC as a European Standard without with agreed common modifications as given below In the official version, for Bibliography, the following notes have to be added for the standards indicated: [5] IEC 60044-6 NOTE Harmonized as EN 60044-6 [16] IEC 60068 series NOTE Harmonized in EN 60068 series (not modified) [17] IEC 60364-4-41 NOTE Harmonized as EN 60364-4-41 [18] IEC 60480 NOTE Harmonized as EN 60480 [19] IEC 60664-1 NOTE Harmonized as EN 60664-1 [23] IEC 62271-100 NOTE Harmonized as EN 62271-100 [24] IEC 62271-102 NOTE Harmonized as EN 62271-102 [25] IEC 62271-103 NOTE Harmonized as EN 62271-103 [26] IEC 62271-104 NOTE Harmonized as EN 62271-104 [27] IEC 62271-105 NOTE Harmonized as EN 62271-105 –3– BS EN 61936-1:2010+A1:2014 -2- EN 61936-1:2010+A1:2014 (E) EN 61936-1:2010/A1:2014 ForewordFtooreawmoernddment A1 The text of document 99/129/FDIS, future IEC 61936-1:2010/A1, prepared by technical committee 99 IEC/TC 99 "System engineering and erection of electrical power installations in systems with nominal voltages above kV a.c and 1,5 kV d.c., particularly concerning safety aspects" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61936-1:2010/A1:2014 The following dates are fixed: • latest date by which the document has to be (dop) 2015-01-02 implemented at national level by (dow) 2017-04-02 publication of an identical national standard or by endorsement • latest date by which the national standards conflicting with the document have to be withdrawn Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights Endorsement notice The text of the International Standard IEC 61936-1:2010/A1:2014 was approved by CENELEC as a European Standard without any modification In the official version, for Bibliography, the following notes have to be added for the standards indicated: Add the following references to the existing list IEC 60092 (Series) NOTE Harmonised as EN 60092 (Series) (not modified) IEC 61892 (Series) NOTE Harmonised as EN 61892 (Series) (not modified) BS EN 61936-1:2010+A1:2014 –4– 6B1S93E6N-1 6©1I9E3C6:-210:1200+1A01:2014 –4– 61936-1 © IEC:2010 CONTENTS INTRODUCTION Scope 10 Normative references 11 Terms and definitions .13 3.1 General definitions .13 3.2 Definitions concerning installations 15 3.3 Definitions concerning types of installations 16 3.4 Definitions concerning safety measures against electric shock 16 3.5 Definitions concerning clearances 17 3.6 Definitions concerning control and protection 18 3.7 Definitions concerning earthing 18 Fundamental requirements .22 4.1 General 22 4.1.1 General requirements 22 4.1.2 Agreements between supplier (manufacturer) and user 23 4.2 Electrical requirements 24 4.2.1 Methods of neutral earthing 24 4.2.2 Voltage classification 24 4.2.3 Current in normal operation 24 4.2.4 Short-circuit current 24 4.2.5 Rated frequency 25 4.2.6 Corona 25 4.2.7 Electric and magnetic fields .25 4.2.8 Overvoltages .25 4.2.9 Harmonics 26 4.3 Mechanical requirements .26 4.3.1 Equipment and supporting structures 26 4.3.2 Tension load 26 4.3.3 Erection load .26 4.3.4 Ice load .27 4.3.5 Wind load 27 4.3.6 Switching forces 27 4.3.7 Short-circuit forces 27 4.3.8 Loss of conductor tension 27 4.3.9 VibSraetisomn i.c l.o a d s 27 4.3.10 Dimensioning of supporting structures 27 4.4 Climatic and environmental conditions 27 4.4.1 General .27 4.4.2 Normal conditions 28 4.4.3 Special conditions 29 4.5 Special requirements .30 4.5.1 Effects of small animals and micro-organisms 30 4.5.2 Noise level .30 4.5.3 Transport 30 Insulation 31 5.1 General 31 – – BS EN 61936-1:2010+A1:2014 – – 61936-B1S© EIENC:621091306+-A11:2:2001104 61936-1 © IEC:2010 5.2 Selection of insulation level 31 5.2.1 Consideration of methods of neutral earthing .31 5.2.2 Consideration of rated withstand voltages 31 5.3 Verification of withstand values 31 5.4 Minimum clearances of live parts 32 5.4.1 General .32 5.4.2 Minimum clearances in voltage range I .32 5.4.3 Minimum clearances in voltage range II 32 5.5 Minimum clearances between parts under special conditions 34 5.6 Tested connection zones 35 Equipment 35 6.1 General requirements 35 6.1.1 Selection 35 6.1.2 Compliance .35 6.1.3 Personnel safety 35 6.2 Specific requirements 35 6.2.1 Switching devices 35 6.2.2 Power transformers and reactors 36 6.2.3 Prefabricated type-tested switchgear 37 6.2.4 Instrument transformers 37 6.2.5 Surge arresters 38 6.2.6 Capacitors 38 6.2.7 Line traps 38 6.2.8 Insulators 38 6.2.9 Insulated cables 38 6.2.10 Conductors and accessories 41 6.2.11 Rotating electrical machines 41 6.2.12 Generating units 42 6.2.13 Generating unit main connections 42 6.2.14 Static converters 42 6.2.15 Fuses 43 6.2.16 Electrical and mechanical Interlocking 43 Installations 43 7.1 General requirements 43 7.1.1 Circuit arrangement 43 7.1.2 Documentation 44 7.1.3 Transport routes 44 7.1.4 Aisles and access areas 45 7.1.5 Lighting .45 7.1.6 Operational safety 45 7.1.7 Labelling 45 7.2 Outdoor installations of open design 45 7.2.1 Protective barrier clearances 46 7.2.2 Protective obstacle clearances 46 7.2.3 Boundary clearances 46 7.2.4 Minimum height over access area 46 7.2.5 Clearances to buildings 47 7.2.6 External fences or walls and access doors 47 7.3 Indoor installations of open design 47 BS EN 61936-1:2010+A1:2014 – – 6B1S93E6N-1 6©1I9E3C6:-210:1200+1A01:2014 – – 61936-1 © IEC:2010 7.4 Installation of prefabricated type-tested switchgear 48 7.4.1 General .48 7.4.2 Additional requirements for gas-insulated metal-enclosed switchgear 48 7.5 Requirements for buildings 50 7.5.1 Introduction .50 7.5.2 Structural provisions 50 7.5.3 Rooms for switchgear 51 7.5.4 Maintenance and operating areas 51 7.5.5 Doors 52 7.5.6 Draining of insulating liquids 52 7.5.7 Air conditioning and ventilation 52 7.5.8 Buildings which require special consideration 53 7.6 High voltage/low voltage prefabricated substations .53 7.7 Electrical installations on mast, pole and tower 53 Safety measures 60 8.1 General 59 8.2 Protection against direct contact 59 8.2.1 Measures for protection against direct contact 59 8.2.2 Protection requirements .60 8.3 Means to protect persons in case of indirect contact 61 8.4 Means to protect persons working on electrical installations 61 8.4.1 Equipment for isolating installations or apparatus .61 8.4.2 Devices to prevent reclosing of isolating devices 62 8.4.3 Devices for determining the de-energized state 62 8.4.4 Devices for earthing and short-circuiting 62 8.4.5 Equipment acting as protective barriers against adjacent live parts 63 8.4.6 Storage of personal protection equipment 64 8.5 Protection from danger resulting from arc fault .64 8.6 Protection against direct lightning strokes 64 8.7 Protection against fire 65 8.7.1 General .65 8.7.2 Transformers, reactors 66 8.7.3 Cables .69 8.7.4 Other equipment with flammable liquid 69 8.8 Protection against leakage of insulating liquid and SF6 69 8.8.1 Insulating liquid leakage and subsoil water protection 69 8.8.2 SF6 leakage .71 8.8.3 Failure with loss of SF6 and its decomposition products 71 8.9 Identification and marking 71 8.9.1 General .71 8.9.2 Information plates and warning plates 71 8.9.3 Electrical hazard warning 72 8.9.4 Installations with incorporated capacitors 72 8.9.5 Emergency signs for emergency exits 72 8.9.6 Cable identification marks 72 Protection, control and auxiliary systems 787 9.1 Monitoring and control systems 778 9.2 DC and AC supply circuits .798 9.2.1 General 789