CSA C22.2 No. 158:10

National Standard of Canada

(reaffirmed 2019)

Terminal blocks

REVISED OCTOBER 2019

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  Revision History

  CSA C22.2 No. 158-10, Terminal blocks

  
  

  National Standard of Canada — October 2019

  Outside front cover, National Standard of Canada text, and title page. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.

  
  

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  CSA C22.2 No. 158:10

  March 2010

  
  

  Title: Terminal blocks

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National Standard of Canada

CSA C22.2 No. 158:10

Terminal blocks

®A trademark of the Canadian Standards Association, operating as “CSA Group”

Published in March 2010 by CSA Group

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ICS 29.120.20; 29.120.60

ISBN 978-1-55491-390-9

© 2010 Canadian Standards Association

All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

© Canadian Standards Association Terminal blocks

Contents

Technical Committee on Industrial Products v Subcommittee on Terminal Assemblies vi Preface vii

1. Scope 1

   
   

2. General requirements and reference publications 1

   1. General requirements 1

   2. Reference publications 2

      
      

3. Definitions 2

   
   

4. Construction 3

   
   

5. Marking 5

   
   

6. Tests 6

   1. General 6

   2. Selection and preparation of specimens for static heating and dielectric strength tests 7

   3. Secureness test 8

   4. Static heating test 8

   5. Pullout test 9

   6. Dielectric strength test 9

   7. Accelerated aging test 10

   8. Verification of the performance of the terminal assemblies of a terminal block 10

   9. Mounting security test 10

   10. Corrosion cracking test 11

   11. Aluminum conductors 11

   12. Spring force connections 11

       1. General 11

       2. Secureness and pullout tests 11

       3. Conditioning 12

       4. Temperature test 12

       5. Dielectric voltage-withstand test 12

       6. Heat cycling test 12

   13. Short-circuit current ratings for terminal blocks 12

Annexes

A (normative) — Short-circuit current ratings for terminal blocks 24

Tables

1. — Minimum acceptable spacings 13

2. — Stranded conductor for test 14

3. — Tightening torque for wire binding

   screws and stud-and-nut type connectors 14

4. — Tightening torque for screws* 15

5. — Tightening torque for slotted-head screws smaller than No. 10 intended for use with No. 8 AWG or smaller conductors 16

   
   

   March 2010 iii

   C22.2 No. 158-10 © Canadian Standards Association

   
   

   
   

6. — Tightening torque for socket-head screws 16

7. — Values for secureness and pullout test 17

8. — Current for static heating test 18

9. — Tests and sequence of tests 20

10. — Forces for tab pull test 20

11. — Oven temperatures for aging test 20

12. — Sequence of tests for terminal blocks having spring force connections 21

Figures

1. — Arrangement for the verification of attachment of the conductor to the clamping unit and of the terminal assembly to the insulator 22

2. — Typical wiring for heating tests 23

iv March 2010

© Canadian Standards Association Terminal blocks

Preface

This is the third edition of CSA C22.2 No. 158, one of a series of Standards issued by the Canadian Standards Association under Part II of the Canadian Electrical Code. It supersedes the previous editions, published in 1987 and 1984.

This edition incorporates the following changes from the previous edition:

1. updates to other referenced standards;

2. a change in reference to CAN/CSA-C22.2 No. 0.17 for insulation materials testing;

3. the addition of requirements and markings for spring force terminals;

4. revision to the static heating test;

5. an updated corrosion cracking test;

6. the addition of short-circuit current ratings; and

7. an updated table for static heating test values.

   For general information on the Standards of the Canadian Electrical Code, Part II, see the preface of CAN/CSA-C22.2 No. 0, General Requirements — Canadian Electrical Code, Part II.

   This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.

   This Standard was prepared by the Subcommittee on Terminal Assemblies, under the jurisdiction of the Technical Committee on Industrial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the Technical Committee.

   Interpretations: The Strategic Steering Committee on Requirements for Electrical Safety has provided the following direction for the interpretation of standards under its jurisdiction: “The literal text shall be used in judging compliance of products with the safety requirements of this Standard. When the literal text cannot be applied to the product, such as for new materials or construction, and when a relevant committee interpretation has not already been published, CSA’s procedures for interpretation shall be followed to determine the intended safety principle.”

   
   

   March 2010

   
   

   Notes:

   1. Use of the singular does not exclude the plural (and vice versa) when the sense allows.

   2. Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.

   3. This publication was developed by consensus, which is defined by CSA Policy governing standardization — Code of good practice for standardization as “substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity”. It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this publication.

   4. CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee.

   5. All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.

      Requests for interpretation should

      1. define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;

      2. provide an explanation of circumstances surrounding the actual field condition; and

      3. be phrased where possible to permit a specific “yes” or “no” answer.

Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are published in CSA’s periodical Info Update, which is available on the CSA Web site at www.csa.ca.

March 2010 vii

© Canadian Standards Association Terminal blocks

C22.2 No. 158-10

Terminal blocks

1. Scope

   
   

   1.1

   This Standard covers assemblies of wiring terminals and supporting blocks for copper conductors, copper and aluminum conductors, and aluminum conductors rated at a maximum of 1500 V and 2000 kcmil, intended to provide for the connection of wiring designed to be used in accordance with the Rules of the Canadian Electrical Code, Part I.

   
   

   1.2

   These terminal blocks are intended to support permanently and to insulate wire terminations and joints from each other and from the surface on which the terminal block is mounted, where the absence of such support or insulation could result in a hazard.

   
   

   1.3

   Terminal blocks can be of various designs, such as sectional, modular, or one-piece.

   
   

   1.4

   Terminal blocks can employ a combination of connectors.

   
   

   1.5

   In CSA standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

   Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

   Notes to tables and figures are considered part of the table or figure and may be written as requirements.

   Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.

   
   

   1.6

   The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

   
   

2. General requirements and reference publications

2.1 General requirements

General requirements applicable to this Standard are given in CAN/CSA-C22.2 No. 0, unless otherwise specified.

March 2010 1