IEC_60364-7-704-2017.pdf

IEC 60364-7-704 Edition 3.0 2017-03 INTERNATIONAL STANDARD Low v oltage electrical installations Part 7-704:Requirements for special installations or locations Construction and demolition site installations IEC 60364-7-704:2017-03(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone applica tion for consulting the entir e bibliogr aphical informa tion on IEC International Standar ds,Technical Specifica tions,Technical Reports and other documents.Av ailable for PC,Mac OS,Android Tablets and iPad.IEC publications search-www.iec.ch/searchpub The adv anced sear ch enables to find IEC publications by a var iety of cr iter ia(refer ence number,text,technica l committee,).It also gives infor ma tion on pr ojects,replaced and w ithdraw n publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to da te on all new IEC publications.Just Published details all new publica tions released.Av ailable online and also once a month by email.Electropedia-www.electropedia.org The w or lds leading online dictionary of electronic and electrical terms containing 20 000 terms and definitions in English and Fr ench,w ith equiv alent ter ms in 16 additional languages.Also k nown as the Inter national Electr otechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 65 000 electrotechnical terminology entries in English and Fr ench extracted fr om the Terms and Definitions clause of IEC publica tions issued since 2002.Some entr ies hav e been collected from ear lier publications of IEC TC 37,77,86 and CISPR.IEC Customer Serv ice Centre-webstore.iec.ch/csc If you w ish to giv e us your feedback on this publication or need fur ther assistance,plea se contact the Customer Ser v ice Centre:csciec.ch.IEC 60364-7-704 Edition 3.0 2017-03 INTERNATIONAL STANDARD Low v oltage electrical installations Part 7-704:Requirements for special installations or locations Construction and demolition site installations INT ERNAT IONAL ELECT ROT ECHNICAL COMMISSION ICS 29.020;91.140.50 ISBN 978-2-8322-4020-5 Registered t rademark of the Internat ional Electrotechnica l Commission Warning!Mak e sure that you obtained this publication from an authorized distributor.2 IEC 60364-7-704:2017 IEC 2017 CONTENTS FOREWORD.3 INTRODUCTION.5 704 Construction and demolition site installations.6 704.1 Scope.6 704.2 Normative references.6 704.3 Terms and definitions.7 704.30 Assessment of general characteristics.7 704.31 Purposes,supplies and structure.7 704.313 Supplies.7 704.4 Protection for safety.7 704.41 Protection against electric shock.7 704.410 Introduction.7 704.411 Protective measure:automatic disconnection of supply.8 704.414 Protective measure:Extra-low voltage provided by SELV and PELV.8 704.44 Protection against voltage disturbances and electromagnetic disturbances.8 704.443 Protection against transient overvoltages of atmospheric origin or due to switching.8 704.5 Selection and erection of equipment.8 704.51 Common rules.8 704.511 Compliance with standards.8 704.512 Operational conditions and external influences.9 704.52 Wiring systems.9 704.53 Isolation,switching and control.9 704.536 Isolation and switching.9 704.56 Safety services.10 704.6 Verification.10 Annex A(informative)List of notes concerning certain countries.11 Bibliography.15 IEC 60364-7-704:2017 IEC 2017 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW VOLTAGE ELECTRICAL INSTALLATIONS Part 7-704:Requirements for special installations or locations Construction and demolition site installations 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 co-operation on all questions concerning standardization in the electrical and electronic fields.To this end and in a