1、C22.2 No. 248.8-11Low-voltage fuses Part 8: Class J fusesLegal Notice for StandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunteers representing varied v
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17、ereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.CSA Standards Update ServiceC22.2 No. 248.8-11May 2011Title:Low-voltage fuses Part 8: Class J fusesPagination:12 page
18、s, each dated May 2011To register for e-mail notification about any updates to this publicationgo to www.ShopCSA.caclick on E-mail Services under MY ACCOUNTclick on CSA Standards Update ServiceThe List ID that you will need to register for updates to this publication is 2421214.If you require assist
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20、1Third EditionUnderwriters Laboratories Inc.UL 248-8Third EditionLow-Voltage Fuses Part 8: Class J FusesMay 13, 2011ANSI/UL 248-8-2011Commitment for AmendmentsThis standard is issued jointly by the Association of Standardization and Certification (ANCE), theCanadian Standards Association (CSA), and
21、Underwriters Laboratories Inc. (UL). Comments orproposals for revisions on any part of the standard may be submitted to ANCE, CSA, or UL at anytime.Revisions to this standard will be made only after processing according to the standards developmentprocedures of ANCE, CSA, and UL. CSA and UL will iss
22、ue revisions to this standard by means of anew edition or revised or additional pages bearing their date of issue. ANCE will incorporate the samerevisions into a new edition of the standard bearing the same date of issue as the CSA and UL pages.Copyright 2011Rights reserved in favor of ANCE.ISBN 978
23、-1-55491-639-9 2011 Canadian Standards AssociationAll rights reserved. No part of this publication may be reproduced in any form whatsoever without theprior permission of the publisher.CSA Standards are subject to periodic review, and suggestions for their improvement will be referredto the appropri
24、ate committee. To submit a proposal for change to CSA Standards, please send thefollowing information to inquirescsa.ca and include Proposal for change in the subject line:Standard designation (number); relevant clause, table, and/or figure number; wording of the proposedchange; and rationale for th
25、e change.To purchase CSA Standards and related publications, visit CSAs Online Store at www.ShopCSA.ca orcall toll-free 1-800-463-6727 or 416-747-4044.Copyright 2011 Underwriters Laboratories Inc.ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standardshoul
26、d be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regardingthose Standards shall remain the sole and exclusive property of UL.This ANSI/UL Standard for Safety consists of the Third Edition including revisions through May 13,2011. The most recent designation of
27、ANSI/UL 248-8 as an American National Standard (ANSI)occurred on May 13, 2011. ANSI approval for a standard does not include the Cover Page, TransmittalPages, Title Page (front and back), or the Preface.Comments or proposals for revisions on any part of the Standard may be submitted to UL at any tim
28、e.Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative StandardsDevelopment System (CSDS) at http:/.To purchase UL Standards, visit Comm 2000 at http:/m- call toll-free 1-888-853-3503.CONTENTSPreface .41 General 61.1 Scope .64 Classification .65 Characteristics 65.2 Volt
29、age rating 65.3 Current rating 65.5 Interrupting rating .65.6 Peak let-through current and clearing I2t characteristics .77 Construction 87.1 Dimensions 88 Tests .108.2 Verification of temperature rise and current-carrying capacity .108.4 Verification of operation at rated voltage .118.5 Verificatio
30、n of peak let-through current and clearing I2t characteristics .12MAY 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8-11 UL 248-8 3PrefaceThis is the harmonized ANCE, CSA, and UL standard for Low-Voltage Fuses Part 8: Class J Fuses. Itis the second edition of NMX-J-009/248/8-ANCE, the third editio
31、n of CSA C22.2 No. 248.8-11, and thethird edition of UL 248-8. This edition of NMX-J-009-248/8-ANCE cancels the previous edition publishedin 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 Association of Stan
32、dardization 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 theStandard.The present Mexican Standard was developed by the CT 32 from the Comit
33、e de Normalizacion de laAsociacion de Normalizacion y Certificacion, A.C., CONANCE, with the collaboration of the fusemanufacturers and users.This standard was reviewed by the CSA Subcommittee on Fuses and Fuseholders, under the jurisdictionof the CSA Technical Committee on Industrial Products and t
34、he CSA Strategic Steering Committee onRequirements 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 AmericanNational Standard.A UL standard is current only if it incorporates
35、 the most recently adopted revisions, all of which areitemized 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 beconsidered a minimum quantity.Note: Although the intende
36、d primary application of this standard is stated in its scope, it is important to note thatit remains the responsibility of the users of the standard to judge its suitability for their particular purpose.Level of HarmonizationThis standard is published as an identical standard for ANCE, CSA, and UL.
37、 An identical standard is astandard that is exactly the same in technical content except for national differences resulting fromconflicts in codes and governmental regulations. Presentation is word for word except for editorialchanges.InterpretationsThe interpretation by the standards development or
38、ganization of an identical or equivalent standard isbased on the literal text to determine compliance with the standard in accordance with the proceduralrules of the standards development organization. If more than one interpretation of the literal text has beenidentified, a revision is to be propos
39、ed as soon as possible to each of the standards developmentorganizations to more accurately reflect the intent.ANCE Effective DateThe effective date for ANCE will be announced through the Diario Oficial de la Federacin (OfficialGazette) and is indicated on the cover page.MAY 13, 2011NMX-J-009/248/8-
40、ANCE CSA C22.2 NO. 248.8-11 UL 248-84CSA Effective DateThe effective date for CSA International will be announced through CSA Informs or a CSA certificationnotice.UL Effective DateAs of May 13, 2011 all products Listed or Recognized by UL must comply with the requirements in thisstandard.A UL effect
41、ive date is one established by Underwriters Laboratories Inc. and is not part of the ANSIapproved standard.MAY 13, 2011 NMX-J-009/248/8-ANCE CSA C22.2 NO. 248.8-11 UL 248-8 5Low-Voltage Fuses Part 8: Class J fuses1 GeneralNOTE This Part is intended to be read together with the Standard for Low-Volta
42、ge 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 Part1. The requirements of Part 1 apply unless modified by this Part. For Clauses not shown below, refer to the Standard forLow-Voltage Fuses Part
43、1: General Requirements, NMX-J-009/248/1-ANCE CAN/CSA C22.2 No. 248.1-11 UL248-1.1.1 ScopeThis Part applies to Class J fuses rated 600 A or less and 600 V ac. DC ratings are optional.4 ClassificationClass J Fuses are non-renewable and current-limiting with an interrupting rating of 200,000 A. Class
44、Jfuses are divided into six body sizes with the maximum current rating Infor each size specified in this Part.Time-delay ratings are optional.5 Characteristics5.2 Voltage ratingFor AC, the rating shall be 600 V ac.The DC voltage rating may be different from the AC rating.5.3 Current ratingRefer to F
45、igure A for range of current ratings in each body size.5.5 Interrupting ratingFor 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, 2011NMX-J-009/248/8
46、-ANCE CSA C22.2 NO. 248.8-11 UL 248-865.6 Peak let-through current and clearing I2t characteristicsMaximum values of peak let-through current and clearing I2t are given in Table A (see 8.5.3). Peaklet-through currents shall not exceed the levels defined by the appropriate Let Through Function specif
47、iedin Table A, as verified through measurement of peak let-through currents at 50, 100, 200, and, ifapplicable, 300 kA. Clearing I2t values recorded shall not exceed the limits specified in Table A as verifiedthrough measurement of clearing I2t values at 50, 100, 200, and, if applicable, 300 kA.Tabl
48、e A Maximum peak let-through current and clearing I2t for Class J fusesCurrentrating In,ABetween thresholdand 50 kAAt 100 kA At 200 kA At 300 kA, ifapplicablePeakLet-ThroughFunctionPeaklet-throughcurrent, AI2t,ampere-squaredsecondsPeaklet-throughcurrent, AI2t,ampere-squaredsecondsPeaklet-throughcurr
49、ent, AI2t,ampere-squaredsecondsPeaklet-throughcurrent, AI2t,ampere-squaredseconds1 1,000 8003 1,500 1,2006 2,300 2,00010 3,300 3,00015 4,000 4,00020 5,000 5,00025 6,000 5,50030 6,000 7,000 7,500 7,000 12,000 7,000 18,500 8,400 Y =1E-07x2+0.015x +500035 7,500 12,00040 8,000 17,00045 8,500 18,00050 9,000 22,00060 8,000 30,000 10,000 30,000 16,000 30,000 24,367 36,000 Y =1E-07x2+0.02x +6666.770 11,500 50,00080 12,500 60,00090 13,500 75,000100 12,000 60,000 14,000 80,000 20,000 80,000
