1、 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
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9、ed 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 COM
10、MISSION 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 definiti
11、ons.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
12、 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-defl
13、ection,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 stren
14、gth.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
15、 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 t
16、hread 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
