IEC 61950:2019

Cable management systems - Specifications for extra-heavy-duty electrical steel conduit fittings and accessories

IEC 61950:2019(E) specifies requirements for conduit fittings, including conduit bodies used with extra-heavy-duty electrical rigid steel (EHDERS) conduit conforming to IEC 60981.
This document does not include requirements for fittings intended for installation in potentially explosive atmospheres.
This third edition cancels and replaces the second edition published in 2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
– change in title and scope to cover only fittings and accessories for use with extra­heavy­duty electrical rigid steel (EHDERS) conduits;
– new and updated definitions of terms;
– addition of requirements for expansion, expansion-deflection and deflection fittings;
– deletion of requirements for cast metal boxes.
A bilingual version of this publication may be issued at a later date.

General Information

• Status: Published
• Publication Date: 15-Sep-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.120.10 - Conduits for electrical purposes
• Technical Committee: SC 23A - Cable management systems
• Drafting Committee: MT 1 - TC 23/SC 23A/MT 1
• Current Stage: PPUB - Publication issued
• Start Date: 04-Oct-2019
• Completion Date: 16-Sep-2019

Relations

• Revises: IEC 61950:2007 - Cable management systems - Specifications for conduit fittings and accessories for cable installations for extra heavy duty electrical steel conduit
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61950 ®
Edition 3.0 2019-09
INTERNATIONAL
STANDARD
Cable management systems –
Specifications for extra-heavy-duty electrical steel conduit fittings and
accessories
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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

– 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

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 Temperature rating . 36
8.2.3 Unthreaded bushings . 36
8.3 Conduit bodies . 36
8.3.1 Manufacturer identification . 36
8.3.2 Specific conditions of installation . 37
8.3.3 Short conduit bodies . 37
8.3.4 Angle conduit bodies . 37
8.3.5 Conduit bodies requiring pulling compound . 37
8.4 Fittings for threaded hubs . 37
8.5 Expansion, expansion-deflection and deflection fittings . 37
9 Type tests . 38
9.1 General . 38
9.1.1 Samples under test . 38
9.1.2 Mechanical connection . 38
9.1.3 Number of samples . 38
9.1.4 Locknuts . 38
9.1.5 Temperature . 38
9.1.6 Assembly . 38
9.2 Concrete-tightness test . 38
9.3 Wet locations test . 39
9.4 Flammability test . 42
9.5 Electrical continuity test .
...