ANSI UL 248-14-2000 UL Standard for Safety Low-Voltage Fuses C Part 14 Supplemental Fuses (Second Edition Reprint with Revisions Through and Including March 25 2015).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-14 Low-Voltage Fuses Part 14: Supplemental FusesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTH

2、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Low-Voltage Fuses Part 14: Supplemental Fuses, UL 248-14 Second Edition, Dated August 1, 2000 Summary of Topics This revision of ANSI/UL 248-14 is being issued to reaffirm approval as an American Na

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9、D REQUIREMENTS notice. MARCH 25, 2015 UL 248-14 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 25, 2015 UL 248-14 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI

10、SSION FROM UL LOW-VOLTAGE FUSES PART 14: SUPPLEMENTAL FUSES August 1, 2000 (Title Page Reprinted: March 25, 2015) Canadian Standards Association CAN/CSA-C22.2 No. 248.14-00 Second Edition Approved by Underwriters Laboratories Inc. UL 248-14 Second Edition ANSI/UL 248-14-2005 (R2015) National Associa

11、tion of Standardization and Certication of the Electrical Sector NMX-J-009/248/14-2000-ANCE First EditionUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by the Association of Standard

12、ization and Certication (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

13、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 t

14、he standard bearing the same date of issue as the CSA Group and UL pages. Copyright 2005 ANCE Rights reserved in favor of ANCE ISBN 1-55324-252-1 Copyright 2000 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the pub

15、lisher. Copyright 2015 Underwriters Laboratories Inc.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .4 1 General 9 1.1 Scope .9 4 Classication .9 5 Characteristics 9 5.2 Voltage rating 9 5.3 Current rating 9 5.5 Interruptin

16、g rating 10 5.6 Peak let-through current and clearing I 2 t characteristics 10 6 Marking .10 6.1 Marking of fuses 10 7 Construction .11 7.1 Fuse dimensions 11 7.2 Current-carrying parts 11 8 Tests .11 8.1 General 11 8.2 Verication of temperature rise and current-carrying capacity .12 8.3 Verication

17、of overload operation 13 8.4 Verication of operation at rated voltage .13 AUGUST 11, 2005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common UL, CSA, a

18、nd ANCE Standard for Low-Voltage Fuses Part 14: Supplemental Fuses. This is the second edition of UL 248-14, the second edition of CAN/CSA-C22.2 No. 248.14-00 (superseding the rst edition, published in 1994), and the rst edition of NMX-J-009/248/14-2000-ANCE. This Standard was prepared by a Technica

19、l Harmonization Committee comprised of members from Underwriters Laboratories, CSA International, the National Association of Standardization and Certication of the Electrical Sector, the end product manufacturers, and material suppliers. The efforts and support of the members of the Technical Harmo

20、nization 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 Certicacion, A.C., CONANCE, with the collaboration of the fuse manufacturers and users. This Standard was reviewed by the

21、 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 Natio

22、nal Standard. This ANSI/UL Standard for Safety consists of the Second Edition including revisions through March 25, 2015. The most recent designation of ANSI/UL 248-14 as a Reaffirmed American National Standard (ANS) occurred on March 25, 2015. ANSI approval for a standard does not include the Cover

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27、evision shall be proposed as soon as possible to each of the SDOs to more accurately reect the intent. MARCH 25, 2015 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ANCE Effe

28、ctive Date The effective date for ANCE will be announced through the Diario Ocial de la Federation (Official Gazette) and is indicated on the cover page. AUGUST 2, 2010 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION

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30、ill be announced through either a CSA Informs or CSA Certication Notice. UL Effective Date This edition of the standard is now in effect. AUGUST 11, 2005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION

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32、005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 11, 2005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 8UL CO

33、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 14: Supplemental 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

34、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 modied by this Part. For Clauses not shown below, refer to the Standard for Low-Voltage Fuses Part 1: General Requirements, NMX-J-009/248/14-2000-ANCE CAN/CSA C22

35、.2 No. 248.1 UL 248-1. 1.1 Scope This Part applies to supplemental fuses rated 60 A or less intended only for supplementary overcurrent protection where branch circuit or equivalent applications are not involved. DC ratings are optional. 4 Classication Supplemental fuses are constructed so they cann

36、ot be installed in fuseholders intended for fuses covered in the other Parts 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13 and 15 of the Low-Voltage Fuse Standard series. Time-delay ratings are optional. Some supplemental fuses may physically t into Part 5 Class G fuseholders. However, supplemental fuses are

37、intended to protect equipment only and are not permitted to be used instead of Class G fuses in branch circuits. 5 Characteristics 5.2 Voltage rating The DC voltage rating may be different from the AC rating. 5.3 Current rating 60 A or less AUGUST 11, 2005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO

38、. 248.14-00 UL 248-14 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.5 Interrupting rating For AC 10,000 A unless otherwise specied below. The DC interrupting rating may be different from the AC rating. Microfuse: 50 A minimum interrupti

39、ng rating A fuse rated 250 V ac may have a dual interrupting rating. This rating shall be 10,000 A at 125 V ac and a lower interrupting rating at 250 V ac as specied in Table A. Table A Interrupting ratings for dual interrupting rated fuses at 250 V ac Current rating I n , A Minimum interrupting rat

40、ing, A 01 3 5 1.1 3.5 100 3.6 10 200 10.1 15 750 15.1 30 1500 Fuses rated less than 125 V ac may have an interrupting rating less than 10,000 A. Fuses with interrupting ratings greater than 10,000 A shall be rated 50,000 A or 100,000 A, AC. 5.6 Peak let-through current and clearing I 2 t characteris

41、tics Not specied. 6 Marking 6.1 Marking of fuses All required markings shall appear on the smallest package. The term Supplemental Fuse is the appropriate fuse classication, but it does not have to be marked. Neither a fuse nor its package shall bear a marking which states or implies that the fuse i

42、s current-limiting. Except for microfuses, the minimum marking on the fuse shall be: a) the manufacturers name, trademark, or both; b) current rating including the corresponding unit of measurement; and c) voltage rating. For microfuses, the smallest package shall be marked with the required informa

43、tion. Fuses rated above 125 V shall be marked to indicate their current rating. Fuses rated 125 V or less may be marked at the option of the manufacturer. Except for current rating of fuses above 125 V, color coding of microfuses is an acceptable type of marking. When used, the applicable color code

44、 scheme shall be marked on the smallest package. AUGUST 11, 2005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL The designation D may be used as a substitute for Time Delay

45、(for qualifying fuses only). 7 Construction 7.1 Fuse dimensions The dimensions of a supplemental fuse are not specied, except envelope dimensions are given for the microfuse in Part 1, Clause 2.2.7.2. 7.2 Current-carrying parts Ferrous parts inherently protected against corrosion are permitted when

46、the current rating does not exceed 15 amps and when the fuse is intended for soldered connections e.g. surface mount or pigtail type connections. 8 Tests 8.1 General 8.1.1 Types of tests Required test samples are shown in Table 1. Table 1 Number of supplemental fuses to be tested Test description Sa

47、mples Notes Verication of temperature rise and current-carrying capacity 3 Part 1, Table 4 Test 1 1.35 I n 3a Test 3 2.0 I n 3a Test 4 2.0 I n , time-delay fuses only 2 Part 1, Table 5 Test 4a 100 kA 1 d Test 4b 50 kA 1 d Test 4c 10 kA 5 c, d Test 5b2I n 2b , d a Samples may be taken from verication

48、 of temperature rise and current-carrying capacity test. b Required only for fuses which use a ller. May be combined with Part 1, Table 4, Test 3 2.0 I n . c Dual rated fuses in accordance with Clause 5.5(b) require two sets of samples. Tests shall be performed at 125 and 250 V ac. d For DC tests, a

49、nother set of samples of the same quantity shall be used. AUGUST 11, 2005 NMX-J-009/248/14-2000-ANCE CAN/CSA-C22.2 NO. 248.14-00 UL 248-14 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.2 Verication of temperature rise and current-carrying capacity 8.2.1.1 For microfuses, the wire spe