C22.2 No. 248.10-11

(reaffirmed 2020)

Low-voltage fuses — Part 10: Class L fuses

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Update No. 1

C22.2 No. 248.10-11

January 2017

Note: For information about the Standards Update Service, go to shop.csa.ca or e-mail

techsupport@csagroup.org.

Title: Low-Voltage Fuses — Part 10: Class L Fuses — originally published May 2011

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

• Update your copy by inserting these revised pages.

• Keep the pages you remove for reference.

  
  

  Association of Standardization and Certification NMX-J-009/248/10-ANCE

  Second Edition

  
  

  Canadian Standards Association CSA C22.2 No. 248.10-11

  Third Edition

  
  

  Underwriters Laboratories Inc. UL 248-10

  Third Edition

  
  

  Low-Voltage Fuses – Part 10: Class L Fuses

  
  

  May 13, 2011

  
  

  (Title Page Reprinted: January 13, 2017)

  
  

  ANSI/UL 248-10-2011 (R2015)

  Commitment for Amendments

  
  

  This standard is issued jointly by the Association of Standardization and Certification (ANCE), the Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA Group, or UL at anytime. Revisions to this standard will be made only after processing according to the standards development procedures of ANCE, CSA Group, and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorporate the same revisions into a new edition of the standard bearing the same date of issue as the CSA Group and UL pages.

  
  

  
  

  Copyright © 2017

  
  

  Rights reserved in favor of ANCE.

  
  

  
  

  ISBN 978-1-55491-640-5 © 2017 CSA Group

  
  

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  JANUARY 13, 2017 NMX-J-009/248/10-ANCE  CSA C22.2 NO. 248.10-11  UL 248-10 3

  CONTENTS

  Preface 4

  1 General 5

  1.1 Scope 5

  4 Classification 5

  1. Characteristics 5

     1. Voltage rating 5

     2. Current rating 5

1. Interrupting rating 5

2. Peak let-through current and clearing I2t characteristics 7

6 Marking 8

1. Construction 8

   1. Dimensions 8

   2. Current-carrying parts 8

2. Tests 10

1. Verification of temperature rise and current-carrying capacity 10

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

4 NMX-J-009/248/10-ANCE  CSA C22.2 NO. 248.10-11  UL 248-10 MAY 13, 2011

Preface

This is the harmonized ANCE, CSA, and UL standard for Low-Voltage Fuses – Part 10: Class L Fuses. It is the second edition of NMX-J-009/248/10-ANCE, the third edition of CSA C22.2 No. 248.10-11, and the third edition of UL 248-10. This edition of NMX-J-009-248/10-ANCE cancels the previous edition published in 2000. This edition of CSA C22.2 No. 248.10-11 supersedes the previous edition published in 2000.

This harmonized standard was prepared by the Association of Standardization and Certification (ANCE), the Canadian Standards Association (CSA), and Underwriters Laboratories Inc., (UL).

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

The present Mexican Standard was developed by the CT 32 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 Fuseholders, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee.

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

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.

Where reference is made to a specific number of samples to be tested, the specified number is to be considered a minimum quantity.

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 particular purpose.

Level of Harmonization

This standard is published as an identical standard for ANCE, CSA, and UL. An identical standard is a standard that is exactly the same in technical content except for national differences resulting from conflicts in codes and governmental regulations. Presentation is word for word except for editorial changes.

Interpretations

The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of the literal text has been identified, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reflect the intent.

JANUARY 13, 2017 NMX-J-009/248/10-ANCE  CSA C22.2 NO. 248.10-11  UL 248-10 5

Low-Voltage Fuses – Part 10: Class L 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-009/248/1-ANCE  CSA C22.2 No. 248.1-11  UL 248-1.

1.1 Scope

This Part applies to Class L fuses rated 100 – 6000 A and 600 V ac. DC ratings are optional.

1. Classification

   
   

   Class L fuses are non-renewable, current-limiting bolt-in type with an interrupting rating of 200,000 A, or at the manufacturer’s option 300,000 A . Class L fuses are divided into nine body sizes with the maximum current rating In for each size specified in this part. Time-delay ratings are optional.

   
   

2. Characteristics

1. Voltage rating

   
   

   For AC, the rating shall be 600 V ac.

   
   

   The DC voltage rating may be different from the AC rating.

   
   

2. Current rating

Refer to Figure A for the range of current ratings in each body size.

5.5 Interrupting rating

For AC, 200,000 A or 300,000 A at the manufacturer’s option (300,000 A not applicable in Mexico). For DC, the preferred ratings are 20,000, 50,000, 100,000, 150,000, 200,000, or 300,000 A.