IEC_61950-2019.pdf

IEC 61950 Edition 3.0 2019-09 INTERNATIONAL STANDARD Cable management systems Specifications for extra-heavy-duty electrical steel conduit fittings and accessories IEC 61950:2019-09(en)THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2019 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 infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland 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 corrigendum or an amendment might have been published.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and once a month by email.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.Electropedia-www.electropedia.org The worlds leading online dictionary on electrotechnology,containing more than 22 000 terminological entries in English and French,with equivalent terms in 16 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 67 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC 61950 Edition 3.0 2019-09 INTERNATIONAL STANDARD Cable management systems Specifications for extra-heavy-duty electrical steel conduit fittings and accessories INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.120.10 ISBN 978-2-8322-7373-9 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.2 IEC 61950:2019 IEC 2019 CONTENTS FOREWORD.6 1 Scope.8 2 Normative references.8 3 Terms and definitions.8 4 General requirements.12 4.1 Tests.12 4.2 Metallic materials.12 4.2.1 General.12 4.2.2 Corrosion protection.12 4.3 Non-metallic materials.13 4.3.1 Flammability.13 4.3.2 Materials for bushings and insulating liners.13 4.3.3 Elastomeric materials.14 4.3.4 Gasket materials.14 4.4 Construction.15 4.4.1 Threads for fittings and conduit bodies.15 4.4.2 Offset and angle fittings.15 4.5 Screws.16 4.6 Locknuts.16 4.6.1 Construction.16 4.6.2 Functional requirements for fitting locknuts.17 4.7 Classifications.17 4.7.1 Concrete-tight type.17 4.7.2 Wet-location type.19 4.7.3 Expansion,expansion-deflection,deflection fitting.20 5 Fittings for EHDERS systems.20 5.1 Types.20 5.2 Fittings for threaded EHDERS conduit.20 5.2.1 End stop.20 5.2.2 Torque test.20 5.2.3 Earth fault.21 5.2.4 Threaded reducers.22 5.3 Fittings for unthreaded EHDERS conduit.22 5.3.1 Electrical continuity and mechanical strength.22 5.3.2 Earth fault.23 5.3.3 Construction.23 5.4 Bushings.24 5.4.1 General.24 5.4.2 Thermoplastic or thermosetting materials.24 5.5 Service-entrance heads.24 5.5.1 End stops for service-entrance heads.24 5.5.2 Assembly.24 5.5.3 Openings.24 5.5.4 Continuity test.25 5.5.5 Wet-location test.25 5.6 Nipples.25 6 Cast metal conduit bodies and covers.25 IEC 61950:2019 IEC 2019 3 6.1 General.25 6.1.1 Applicability.25 6.1.2 Openings.25 6.2 Materials.25 6.2.1 Wall thickness.25 6.2.2 Coatings on metallic surfaces.25 6.3 Integral bushings.25 6.4 Threads.26 6.5 Threadless connections.26 6.6 External thread construction.26 6.7 Wet-location type.26 7 Conduit bodies and covers.30 7.1 Cross-sectional area.30 7.2 Connection to conduit.30 7.3 Straight conduit bodies.32 7.4 Angle conduit bodies.32 7.5 Short conduit bodies.33 8 Marking.35 8.1 All fittings.35 8.1.1 Permanence and legibility.35 8.1.2 Manufacturer identification.35 8.1.3 Location of marking.35 8.1.4 Specific conditions of installation.35 8.1.5 Specific instructions.35 8.2 Insulating bushings or parts.36 8.2.1 Colour coding.36 8.2.2 Tem