CSA C22.2 No. 106:05

National Standard of Canada

(reaffirmed 2019)

HRC-Miscellaneous fuses

REVISED OCTOBER 2019

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  Revision History

  CSA C22.2 No. 106:05, HRC-Miscellaneous fuses

  
  

  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. 106:05

  December 2005

  
  

  Title: HRC-Miscellaneous fuses

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National Standard of Canada

CSA C22.2 No. 106:05

HRC-Miscellaneous fuses

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

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ICS 29.120.50

ISBN 1-55397-653-3

© 2005 Canadian Standards Association

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© Canadian Standards Association HRC-Miscellaneous fuses

Contents

Technical Committee on Industrial Products v

Subcommittee on C22.2 No. 106 vi

Preface vii

Foreword viii

1. Scope 1

   
   

2. Reference publications 1

   
   

3. Definitions 1

   
   

4. General requirements 2

   
   

5. Construction 2

   1. General 2

   2. Characteristics 4

      1. General 4

      2. HRCI-MISC fuses 4

      3. HRCII-MISC fuses 4

         
         

6. Markings 4

   
   

7. Tests 5

   1. General 5

   2. Verification of temperature rise and current-carrying capacity 7

      1. Arrangement of fuses 7

      2. Test circuit characteristics 7

      3. Test method 8

      4. Acceptability of test results 9

   3. Verification of overload operation 9

      1. Arrangement of fuses 9

      2. Test circuit characteristics 9

      3. Test method 9

      4. Acceptability of test results 10

   4. Verification of operation at rated voltage 10

      1. Arrangement of fuses 10

      2. Test circuit characteristics 11

      3. Test method 11

      4. Acceptability of test results 12

   5. Verification of peak let-through current and clearing I2t characteristics 12

      1. Measurement 12

      2. Test method 12

      3. Acceptability of test results 12

Annexes

A (informative) — Verification of the test set-up 14

December 2005 iii

C22.2 No. 106-05 © Canadian Standards Association

Tables

1. — Summary of tests 6

2. — Minimum number of samples for testing to be supplied by the manufacturer 6

3. — Minimum number of samples to be tested for each test 6

4. — Temperature test connections for fuses rated 0 to 600 A 7

5. — Maximum bus bar cross-section and dummy fuse temperature rise 8

6. — Verification of overload operation 10

7. — Verification of operation at rated voltage 11

8. — Maximum peak let-through current (Ip) and maximum clearing I2t for available current of 200 kA rms symmetrical HRCI-MISC fuses 13

9. — Maximum peak let-through current (Ip) and maximum clearing I2t for available current of 200 kA rms symmetrical HRCII-MISC fuses 13

Figures

1 — Aging time versus aging temperature for paper tubes 3

iv December 2005

© Canadian Standards Association HRC-Miscellaneous fuses

Technical Committee on Industrial Products

K. Powell Criterions,

Glen Williams, Ontario

Representing Manufacturers

Chair

1. Paulsen Province of New Brunswick, Fredericton, New Brunswick Representing Regulatory Authorities

   Vice-Chair

   
   

2. Pope CSA,

Mississauga, Ontario

Project Manager

Representing Regulatory Authorities

D.R.A. MacLeod Nova Scotia Department of Environment and

Labour,

Halifax, Nova Scotia

T. Olechna Electrical Safety Authority, Mississauga, Ontario

A. Tsisserev City of Vancouver, Vancouver, British Columbia

Representing Manufacturers

R.M. Bartholomew Electric Power Equipment (1986) Ltd.,

Vancouver, British Columbia

W.K. Jones Cutler-Hammer Canada Inc., Burlington, Ontario

M. Smith Rockwell Automation Canada Inc., Cambridge, Ontario

Representing General Interests

M. Kasumovich Mississauga, Ontario

D.G. Morlidge Fluor Canada Ltd., Calgary, Alberta

R. Roberton Shell Canada Limited, Calgary, Alberta

December 2005 v

C22.2 No. 106-05 © Canadian Standards Association

Subcommittee on C22.2 No. 106

C. Thwaites Ferraz Shawmut Canada Inc., Toronto, Ontario

Chair

M. Bird Fusetek, Kingston, Ontario

T. Flood A.J. Flood and Associates, Burlington, Ontario

D.B. Giblin Cooper Bussmann, Inc., St. Louis, Missouri, USA

D. Heron Electrical Safety Authority, Worthington, Ontario

S. Kimura San-O Industrial Corporation, Holbrook, New York, USA

Associate

F.G. Ladonne Underwriters Laboratories Inc.,

Northbrook, Illinois, USA

Associate

R. MacKenzie CSA,

Toronto, Ontario

Associate

R. McBrien Bel Fuse Inc.,

Baiting Hollow, New York, USA

G. Montminy Régie du bâtiment du Québec,

Québec, Québec

E. Rawlings Edison Fusegear Canada, Mississauga, Ontario

Associate

W. Travis Littlefuse, Inc.,

Des Plaines, Illinois, USA

M. Henville CSA,

Mississauga, Ontario

Project Manager

vi December 2005

© Canadian Standards Association HRC-Miscellaneous fuses

Preface

This is the fifth edition of CSA C22.2 No. 106, HRC-Miscellaneous fuses, one of a series of Standards issued under Part II of the Canadian Electrical Code. It supersedes the previous editions published in 1992, 1990, 1985, and 1953 under the title HRC Fuses.

This Standard specifies requirements for HRCI-MISC and HRCII-MISC fuses.

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

This Standard was prepared by the Subcommittee on C22.2 No. 106, 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. It will be submitted to the Standards Council of Canada for approval as a National Standard of Canada.

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.”

December 2005

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.

December 2005 vii

C22.2 No. 106-05 © Canadian Standards Association

Foreword

The Canadian Standards Association (CSA) develops standards under the name Canadian Standards Association, and provides certification and testing under the name CSA International. CSA International provides certification services for manufacturers who, under license from CSA, wish to use the appropriate registered CSA Marks on certain products of their manufacture to indicate conformity with CSA Standards.

CSA Certification for a number of products is provided in the interest of maintaining agreed-upon standards of quality, performance, interchangeability and/or safety, as appropriate. Where applicable, certification may form the basis for acceptance by inspection authorities responsible for enforcement of regulations. Where feasible, programs will be developed for additional products for which certification is desired by producers, consumers, or other interests. In performing its functions in accordance with its objectives, CSA does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of the Association represent its professional judgement given with due consideration to the necessary limitations of practical operation and state of the art at the time the Standard is processed.

Products in substantial accord with this Standard but which exhibit a minor difference or a new feature may be deemed to meet the Standard providing the feature or difference is found acceptable utilizing appropriate CSA International Operating Procedures. Products that comply with this Standard shall not be certified if they are found to have additional features which are inconsistent with the intent of this Standard. Products shall not be certifiable if they are discovered to contravene applicable laws or regulations.

Testing techniques, test procedures, and instrumentation frequently must be prescribed by

CSA International in addition to the technical requirements contained in Standards of CSA. In addition to markings specified in the Standard, CSA International may require special cautions, markings, and instructions that are not specified by the Standard.

Some tests required by CSA Standards may be inherently hazardous. The Association neither assumes nor accepts any responsibility for any injury or damage that may occur during or as the result of tests, wherever performed, whether performed in whole or in part by the manufacturer or the Association, and whether or not any equipment, facility, or personnel for or in connection with the test is furnished by the manufacturer or the Association.

Manufacturers should note that, in the event of the failure of CSA International to resolve an issue arising from the interpretation of requirements, there is an appeal procedure: the complainant should submit the matter, in writing, to the Secretary of the Canadian Standards Association.

If this Standard is to be used in obtaining CSA Certification please remember, when making application for certification, to request all current Amendments, Bulletins, Notices, and Technical Information Letters that may be applicable and for which there may be a nominal charge. For such information or for further information concerning CSA Certification, please address your inquiry to Applications and Customer Service, CSA International, 178 Rexdale Boulevard, Toronto, Ontario, Canada M9W 1R3.

viii December 2005

© Canadian Standards Association HRC-Miscellaneous fuses

C22.2 No. 106-05

HRC-Miscellaneous fuses

1. Scope

   This Standard applies to HRC non-renewable cartridge current-limiting fuses of the HRCI-MISC (Form I) type rated 600 A or less and 600 V ac or less, and to HRC non-renewable cartridge current-limiting fuses of the HRCII-MISC (Form II) type rated 1200 A or less and 600 V ac or less, that are intended to be used in accordance with the Canadian Electrical Code, Part I.

   
   

2. Reference publications

   This Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto.

   
   

   CSA (Canadian Standards Association)

   C22.1-02

   Canadian Electrical Code, Part I

   
   

   CAN/CSA-C22.2 No. 0-M91 (R2001)

   General requirements — Canadian Electrical Code, Part II

   CAN/CSA-C22.2 No. 248 series of Standards: CAN/CSA-C22.2 No. 248.1-00

   Low-voltage fuses — Part 1: General requirements

   
   

3. Definitions

The following definitions apply in this Standard:

Arcing time — the time from the instant the fuse element or link has melted and arcing is initiated until final circuit interruption by the fuse.

Clearing time — the time from the beginning of an overcurrent to the final circuit interruption. The clearing time is equal to the sum of the melting time and the arcing time.

Current-limiting fuse — a fuse that, within a specified overcurrent range, limits the clearing time at rated voltage to an interval equal to or less than the first major or symmetrical current loop duration, and limits the peak current to a value less than the available peak current.

Current-limiting range — the range of prospective currents from the threshold current to the interrupting current rating of a current-limiting fuse.

Current rating (In) — the nominal root-mean-square (rms) ac or dc ampere rating, based on specified conditions, that is assigned to a fuse.

Dummy — a copper bar of specified dimensions used to calibrate equipment for temperature testing HRCII-MISC fuses.

HRC (high-rupturing capacity) fuse — a fuse with an interrupting rating of at least 100 kA rms symmetrical.

December 2005 1