1、 IEC 60364-7-721 Edition 2.0 2017-06 INTERNA TIONAL STA NDA RD Low-v oltage electrical installations Part 7-721:Requirements for special installations or locations Electrical installations in carav ans and motor carav ans IEC 60364-7-721:2017-06(en)THIS PUBLICA TION IS COPYRIGHT PROTECTED Copyright
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11、 7-721:R equirements for special installations or locations Electrical installations in carav ans and motor carav ans INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.020;91.140.50 ISBN 978-2-8322-4425-8 R egist er ed tr ademar k of t he Int er national Electr ot echnical Commission W arning!Make su
12、re that y ou obtained this publication from an authorized distributor.2 IEC 60364-7-721:2017 IEC 2017 CONTENTS FOREWORD.4 INTRODUCTION.6 721 Electrical installations in caravans and motor caravans.7 721.1 Scope.7 721.2 Normative references.7 721.3 Terms and definitions.8 721.31 Purposes,supplies and
13、 structure.8 721.313 Supplies.8 721.4 Protection for safety.9 721.41 Protection against electric shock.9 721.411 Protective measure:automatic disconnection of supply.9 721.413 Protective measure:electrical separation.9 721.414 Protective measure:extra-low voltage provided by SELV and PELV.9 721.415
14、Additional protection.9 721.43 Protection against overcurrent.10 721.5 Selection and erection of equipment.10 721.51 Common rules.10 721.510 Introduction.10 721.512 Operational conditions and external influences.10 721.514 Identification.10 721.52 Wiring systems.10 721.521 Types of wiring systems.10
15、 721.522 Selection and erection of wiring systems in relation to external influences.11 721.524 Cross-sectional areas of conductors.11 721.526 Electrical connections.11 721.528 Proximity of wiring systems to other services.11 721.53 Isolation,switching and control.12 721.536 Isolation and switching.
16、12 721.54 Earthing arrangements and protective conductors.12 721.543 Protective conductors.12 721.55 Other equipment.12 Annex A(normative)Instructions for electricity supply.14 Annex B(informative)Extra low-voltage DC installations.15 Annex C(informative)Current-carrying capacities.21 Annex D(informative)List of notes concerning certain countries.24 Bibliography.25 Figure C.721.1 Graph for obtaining minimum cross-sectional area for conductors for fixed wiring installations with a voltage drop of