CSA C22.2 No. 248.4:00

National Standard of Canada

(reaffirmed 2019)

Low-Voltage Fuses — Part 4: Class CC Fuses

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Update No. 3

CAN/CSA-C22.2 No. 248.4-00

August 2005

Note: General Instructions for CSA Standards are now called Updates. Please contact CSA Information Products Sales or visit www.ShopCSA.ca for information about the CSA Standards Update Service.

Title: Low-Voltage Fuses — Part 4: Class CC Fuses — originally published August 2000

Revisions issued: Update No. 2 — November 2004

If you are missing any updates, please contact CSA Information Products Sales or visit www.ShopCSA.ca.

The following revisions have been formally approved and are marked by a vertical line in the margin on the attached replacement pages:

CAN/CSA-C22.2 No. 248.4-00 originally consisted of 12 pages, each dated August 2000. It now consists of the following pages:

• Update your copy by inserting these revised pages.

• Keep the pages you remove for reference.

National Association of Standardization and Certification of the Electrical Sector

NMX-J-009/248/4-2000-ANCE

First Edition

Canadian Standards Association

CAN/CSA-C22.2 No. 248.4-00

Second Edition

Underwriters Laboratories Inc.

UL 248-4

Second Edition

LOW-VOLTAGE FUSES – PART 4: CLASS CC FUSES

August 1, 2000

(Title Page Reprinted: August 11, 2005)

ANSI/UL 248-4-2005

Commitment for Amendments

This Standard is issued jointly by the National Association of Standardization and Certification of the Electrical Sector (ANCE), CSA International, and Underwriters Laboratories Incorporated (UL). Amendments to this Standard will be made only after processing according to the Standards writing procedures by ANCE, CSA, and UL.

Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements.

Copyright © 2000,

2005 ANCE

Rights reserved in favor of ANCE

ISBN 1-55324-232-7

Copyright © 2000 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.

ISBN 0-7629-0554-9

Copyright © 1994,

2005

Underwriters Laboratories Inc.

CONTENTS

Preface 4

1 General 9

1.1 Scope 9

1. Classification 9

2. Characteristics 9

1. Voltage rating 9

2. Current rating 9

1. Interrupting rating 9

2. Peak let-through current and clearing I2t characteristics 10

1. Construction 10

   7.1 Dimensions 10

2. Tests 10

1. Verification of temperature rise and current-carrying capacity 11

2. Verification of overload operation 11

3. Verification of operation at rated voltage 11

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

Preface

This is the common UL, CSA, and ANCE Standard for Low-Voltage Fuses – Part 4: Class CC Fuses. This is the second edition of CAN/CSA-C22.2 No. 248.4-00 (superseding the first edition, published in 1994), the second edition of UL 248-4, and the first edition of NMX-J-009/248/4-2000-ANCE.

This Standard was prepared by a Technical Harmonization Committee comprised of members from Underwriters Laboratories, CSA International, the National Association of Standardization and Certification of the Electrical Sector, the end product manufacturers, and material suppliers. The efforts and support of the members of the Technical Harmonization Committee are gratefully acknowledged.

The present Mexican Standard was developed by the TC 32 Fuses from the Comite de Normalizacion de la Asociacion de Normalizacion y Certificacion, A.C., CONANCE, with the collaboration of the fuse manufacturers and users.

This Standard was reviewed by the CSA Subcommittee on Fuses and approved by the Technical Committee on Industrial Products under the jurisdiction of the CSA Strategic Steering Committee on the Requirements for Electrical Safety.

This Standard has been approved by the American National Standards Institute (ANSI) as an American National Standard.

The most recent designation of ANSI/UL 248-4 as an American National Standard (ANSI) occurred on August 1, 2005.

This ANSI/UL Standard for Safety, which consists of the Second edition with revisions through August 11, 2005, is under continuous maintenance, whereby each revision is ANSI approved upon publication. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in UL’s On-Line Collaborative Standards Development System (CSDS) at https://csds.ul.com.

Note: 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 purpose.

Level of Harmonization

This trinational standard is published as an Identical Standard. An identical standard is a standard that is the same in technical content except for conflicts in Codes and Governmental Regulations. Presentation is word for word except for editorial changes.

Interpretations

The interpretation by the SDO (Standards Development Organization) of an identical standard shall be based on the literal text to determine compliance with the standard in accordance with the procedural rules of the SDO. If more than one interpretation of the literal text has been identified, a revision shall be proposed as soon as possible to each of the SDOs to more accurately reflect the intent.

ANCE Effective Date

The effective date for ANCE will be announced through the Diario Oficial de la Federation (Official Gazette) and is indicated on the cover page.

CSA Effective Date

The effective date for CSA will be announced through either a CSA Informs or CSA Certification Notice.

UL Effective Date

This edition of the standard is now in effect.

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Foreword (CSA)

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.

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Low-Voltage Fuses – Part 4: Class CC Fuses

1 General

NOTE –

This Part is intended to be read together with the Standard for Low-Voltage Fuses – Part 1: General Requirements, hereafter referred to as Part 1. The numbering of the Clauses in this Part corresponds to like numbered Clauses in Part 1. The requirements of Part 1 apply unless modified by this Part. For Clauses not shown below, refer to the Standard for Low-Voltage Fuses – Part 1: General Requirements, NMX-J-009/248/4-2000-ANCE  CAN/CSA C22.2 No. 248.1  UL 248-1.

1.1 Scope

This Part applies to Class CC fuses rated 30 A or less and 600 V ac. DC ratings are optional.

1. Classification

   
   

   Class CC fuses are non-renewable and current limiting, with an interrupting rating of 200,000 A. Class CC fuses have one body size. Time-delay ratings are optional.

   
   

2. Characteristics

1. Voltage rating

   
   

   For AC, the rating shall be 600 V ac.

   
   

   For DC, the voltage rating may be different from the AC rating.

   
   

2. Current rating

30 A or less.

5.5 Interrupting rating

For AC – 200,000 A

For DC, the preferred ratings are 10,000, 20,000, 50,000, 100,000, 150,000, or 200,000 A.