UL 248-8-2011 UL Standard for Safety Low-Voltage Fuses - Part 8 Class J Fuses (Third Edition Reprint with Revisions Through and Including August 18 2015)《低压熔断器 第8部分 J级熔断器》.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-8 Low-Voltage Fuses - Part 8: Class J FusesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZE

2、D FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Low-Voltage Fuses - Part 8: Class J Fuses, UL 248-8 Third Edition, Dated May 13, 2011 Summary of Topics This revision of ANSI/UL 2488 is being issued to reaffirm approval as an American National Standard

3、. No changes in requirements are involved. As noted in the Commitment for Amendments statement located on the back side of the title page, UL, CSA, and ANCE are committed to updating this harmonized standard jointly. However, the revision pages dated (June 26, 2015) will not be jointly issued by UL,

4、 CSA, and ANCE as these revision pages only address UL 2488 ANSI approval dates. The new requirements are substantially in accordance with Proposal(s) on this subject dated June 26, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted

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9、hose paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated on this transmittal notice. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SU

10、PERSEDED REQUIREMENTS notice. AUGUST 18, 2015 UL 248-8 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 18, 2015 UL 248-8 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU

11、T PERMISSION FROM UL Association of Standardization and Certication NMX-J-009/248/8-ANCE Second Edition Canadian Standards Association CSA C22.2 No. 248.8-11 Third Edition Underwriters Laboratories Inc. UL 248-8 Third Edition Low-Voltage Fuses Part 8: Class J Fuses May 13, 2011 (Title Page Reprinted

12、: August 18, 2015) ANSI/UL 248-8-2011 (R2015)UL 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 Standardization and Certication (ANCE), the Canadian Standards Assoc

13、iation (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 proc

14、edures 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

15、and UL pages. Copyright 2011 Rights reserved in favor of ANCE. ISBN 978-1-55491-639-9 2011 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. CSA Standards are subject to periodic review, and suggestions

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17、r; wording of the proposed change; and rationale for the change. To purchase CSA Standards and related publications, visit CSAs Online Store at www.ShopCSA.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2015 Underwriters Laboratories Inc. ULs Standards for Safety are copyrighted by U

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19、revisions through August 18, 2015. The most recent designation of ANSI/UL 248-8 as an American National Standard (ANSI) occurred on August 18, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. Comments or proposals for

20、 revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.UL COPYRI

21、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .4 1 General 6 1.1 Scope .6 4 Classication .6 5 Characteristics 6 5.2 Voltage rating 6 5.3 Current rating 6 5.5 Interrupting rating .6 5.6 Peak let-through current and clearing I 2 t ch

22、aracteristics .7 7 Construction 8 7.1 Dimensions 8 8 Tests .10 8.2 Verication of temperature rise and current-carrying capacity .10 8.4 Verication of operation at rated voltage .11 8.5 Verication of peak let-through current and clearing I 2 t characteristics .12 MAY 13, 2011 NMX-J-009/248/8-ANCE CSA

23、 C22.2 NO. 248.8-11 UL 248-8 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the harmonized ANCE, CSA, and UL standard for Low-Voltage Fuses Part 8: Class J Fuses. It is the second edition of NMX-J-009/248/8-ANCE, the third

24、edition of CSA C22.2 No. 248.8-11, and the third edition of UL 248-8. This edition of NMX-J-009-248/8-ANCE cancels the previous edition published in 2000. This edition of CSA C22.2 No. 248.8-11 supersedes the previous edition published in 2000. This harmonized standard was prepared by the Associatio

25、n of Standardization and Certication (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 fro

26、m 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 CSA Subcommittee on Fuses and Fuseholders, under the jurisdiction of the CSA Technical Committee on Industrial P

27、roducts 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 i

28、f 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 specic number of samples to be tested, the specied number is to be considered a minimum quantity. Note: Alt

29、hough 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 fo

30、r ANCE, CSA, and UL. An identical standard is a standard that is exactly the same in technical content except for national differences resulting from conicts in codes and governmental regulations. Presentation is word for word except for editorial changes. Interpretations The interpretation by the s

31、tandards 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 identied, a

32、revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. ANCE Effective Date The effective date for ANCE will be announced through the Diario Ocial de la Federacin (Official Gazette) and is indicated on the cover page. MAY

33、 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8-11 UL 248-8 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Effective Date The effective date for CSA International will be announced through CSA Informs or a CSA certication notice. UL

34、 Effective Date As of May 13, 2011 all products Listed or Recognized by UL must comply with the requirements in this standard. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. MAY 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8

35、-11 UL 248-8 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses Part 8: Class J fuses 1 General NOTE This Part is intended to be read together with the Standard for Low-Voltage Fuses Part 1: General Requirements, hereafter re

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

37、CSA C22.2 No. 248.1-11 UL 248-1. 1.1 Scope This Part applies to Class J fuses rated 600 A or less and 600 V ac. DC ratings are optional. 4 Classication Class J Fuses are non-renewable and current-limiting with an interrupting rating of 200,000 A. Class J fuses are divided into six body sizes with th

38、e maximum current rating I n for each size specied in this Part. Time-delay ratings are optional. 5 Characteristics 5.2 Voltage rating For AC, the rating shall be 600 V ac. The DC voltage rating may be different from the AC rating. 5.3 Current rating Refer to Figure A for range of current ratings in

39、 each body size. 5.5 Interrupting rating For AC, 200,000 A, or 300,000 A at the manufacturers option (300,000 A not applicable in Mexico). For DC, the preferred ratings are 10,000, 20,000, 50,000, 100,000, 150,000, 200,000, or 300,000 A. MAY 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8-11 UL 24

40、8-8 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.6 Peak let-through current and clearing I 2 t characteristics Maximum values of peak let-through current and clearing I 2 t are given in Table A (see 8.5.3). Peak let-through currents sh

41、all not exceed the levels dened by the appropriate Let Through Function specied in Table A, as veried through measurement of peak let-through currents at 50, 100, 200, and, if applicable, 300 kA. Clearing I 2 t values recorded shall not exceed the limits specied in Table A as veried through measurem

42、ent of clearing I 2 t values at 50, 100, 200, and, if applicable, 300 kA. Table A Maximum peak let-through current and clearing I 2 t for Class J fuses Current rating I n , A Between threshold and 50 kA At 100 kA At 200 kA At 300 kA, if applicable Peak Let- Through Function Peak let- through current

43、, A I 2 t, ampere- squared seconds Peak let- through current, A I 2 t, ampere- squared seconds Peak let- through current, A I 2 t, ampere- squared seconds Peak let- through current, A I 2 t, ampere- squared seconds 1 1,000 800 3 1,500 1,200 6 2,300 2,000 10 3,300 3,000 15 4,000 4,000 20 5,000 5,000

44、25 6,000 5,500 30 6,000 7,000 7,500 7,000 12,000 7,000 18,500 8,400 Y = 1E-07x 2 + 0.015x + 5000 35 7,500 12,000 40 8,000 17,000 45 8,500 18,000 50 9,000 22,000 60 8,000 30,000 10,000 30,000 16,000 30,000 24,367 36,000 Y = 1E-07x 2 + 0.02x + 6666.7 70 11,500 50,000 80 12,500 60,000 90 13,500 75,000

45、100 12,000 60,000 14,000 80,000 20,000 80,000 28,367 96,000 Y = 1E-07x 2 + 0.02x + 10667 110 14,500 100,000 125 15,500 150,000 150 17,000 175,000 175 18,500 225,000 200 16,000 200,000 20,000 300,000 30,000 300,000 42,367 360,000 Y = 1E-07x 2 + 0.06x + 12667 225 22,500 350,000 250 24,000 450,000 300

46、26,000 600,000 350 29,000 800,000 MAY 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8-11 UL 248-8 7 Table A Maximum peak let-through current and clearing I 2 t for Class J fuses Continued on Next PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

47、 FROM UL Table A Maximum peak let-through current and clearing I 2 t for Class J fuses Continued Current rating I n , A Between threshold and 50 kA At 100 kA At 200 kA At 300 kA, if applicable Peak Let- Through Function Peak let- through current, A I 2 t, ampere- squared seconds Peak let- through cu

48、rrent, A I 2 t, ampere- squared seconds Peak let- through current, A I 2 t, ampere- squared seconds Peak let- through current, A I 2 t, ampere- squared seconds 400 25,000 1,000,000 30,000 1,100,000 45,000 1,100,000 66,367 1,320,000 Y = 3E-07x 2 + 0.05x + 21667 450 36,000 1,500,000 500 42,000 2,000,0

49、00 600 35,000 2,500,000 45,000 2,500,000 70,000 2,500,000 101,367 3,000,000 Y = 3E-07x 2 + 0.15x + 26667 7 Construction 7.1 Dimensions Fuse dimensions are shown in Figure A. This is generated text for gtxt. Figure A Dimensions of Class J fuses in mm (in) a Ferrule Type:06 0A MAY 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8-11 UL 248-8 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR