1、Low-Voltage Fuses Part 5: Class G FusesAugust 1, 2000CSA InternationalCSA C22.2 No. 248.5-00Second EditionUnderwriters LaboratoriesInc.UL 248-5Second EditionNational Association ofStandardization andCertification of the ElectricalSectorNMX-J-009/248/5-2000-ANCEFirst EditionCommitment for AmendmentsT
2、his Standard is issued jointly by the National Association of Standardization andCertification of the Electrical Sector (ANCE), CSA Internationals, andUnderwriters Laboratories Incorporated (UL). Amendments to this Standard willbe made only after processing according to the Standards writing procedu
3、res byANCE, CSA, and UL.Revisions of this Standard will be made by issuing revised or additional pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the latest set o
4、f revised requirements.Copyright 2000ANCERights reserved in favorof ANCEISBN 1-55324-234-3Copyright 2000CSA InternationalAll rights reserved. Nopart of this publicationmay be reproduced inany form whatsoeverwithout the priorpermission of thepublisher.ISBN 0-7629-0555-7Copyright 1996,2000Underwriters
5、Laboratories Inc.Update No. 3CAN/CSA-C22.2 No. 248.5-00August 2005Note: 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 5: Class G
6、 Fuses originally published August 2000Revisions issued: Update No. 2 November 2004If 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
7、 replacement pages:Revised Title page, copyright page, Contents, Preface, and Clauses 1 and 8.2.4New NoneDeleted Foreword (ANCE) and Foreword (UL)CAN/CSA-C22.2 No. 248.5-00 originally consisted of 14 pages, each dated August 2000. It now consists of the following pages:August 2000 10, 11, 13, and 14
8、November 2004 CoverAugust 2005 19 and 12Update your copy by inserting these revised pages.Keep the pages you remove for reference.Low-Voltage Fuses Part 5: Class G FusesAugust 1, 2000(Title Page Reprinted: August 11, 2005)Canadian StandardsAssociationCAN/CSA-C22.2 No. 248.5-00Second EditionUnderwrit
9、ers LaboratoriesInc.UL 248-5Second EditionANSI/UL 248-5-2005National Association ofStandardization andCertification of the ElectricalSectorNMX-J-009/248/5-2000-ANCEFirst EditionCommitment for AmendmentsThis Standard is issued jointly by the National Association of Standardization andCertification of
10、 the Electrical Sector (ANCE), CSA Internationals, andUnderwriters Laboratories Incorporated (UL). Amendments to this Standard willbe made only after processing according to the Standards writing procedures byANCE, CSA, and UL.Revisions of this Standard will be made by issuing revised or additional
11、pagesbearing their date of issue. A UL Standard is current only if it incorporates themost recently adopted revisions, all of which are itemized on the transmittal noticethat accompanies the latest set of revised requirements.Copyright 2000,2005 ANCERights reserved in favorof ANCEISBN 1-55324-234-3C
12、opyright 2000Canadian StandardsAssociationAll rights reserved. Nopart of this publicationmay be reproduced inany form whatsoeverwithout the priorpermission of thepublisher.ISBN 0-7629-0555-7Copyright 1996,2005UnderwritersLaboratories Inc.CONTENTSPreface .41 General 91.1 Scope .94 Classification .95
13、Characteristics 95.2 Voltage rating 95.3 Current rating 95.5 Interrupting rating .95.6 Peak let-through current and clearing I2t characteristics 107 Construction .107.1 Dimensions .108 Tests .128.2 Verification of temperature rise and current-carrying capacity .128.3 Verification of overload operati
14、on 128.4 Verification of operation at rated voltage .128.5 Verification of peak let-through current and clearing I2t characteristics .13AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 3PrefaceThis is the common UL, CSA, and ANCE Standard for Low-Voltage Fuses Part 5: Cl
15、ass G Fuses. Thisis the second edition of CAN/CSA-C22.2 No. 248.5-00 (superseding the first edition, published in 1996),the second edition of UL 248-5, and the first edition of NMX-J-009/248/5-2000-ANCE.This Standard was prepared by a Technical Harmonization Committee comprised of members fromUnderw
16、riters Laboratories, CSA International, the National Association of Standardization andCertification of the Electrical Sector, the end product manufacturers, and material suppliers. The effortsand support of the members of the Technical Harmonization Committee are gratefully acknowledged.The present
17、 Mexican Standard was developed by the TC 32 Fuses from the Comite de Normalizacion dela Asociacion 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 approved by the TechnicalComm
18、ittee on Industrial Products under the jurisdiction of the CSA Strategic Steering Committee on theRequirements for Electrical Safety.This Standard has been approved by the American National Standards Institute (ANSI) as an AmericanNational Standard.The most recent designation of ANSI/UL 248-5 as an
19、American National Standard (ANSI) occurred onAugust 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 an
20、y 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 StandardsDevelopment System (CSDS) at http:/.Note: Although the intended primary application of this Standard is stated in its Scope, it is important to note th
21、at it remains theresponsibility of the users of the Standard to judge its suitability for their particular purpose.Level of HarmonizationThis trinational standard is published as an Identical Standard. An identical standard is a standard that isthe same in technical content except for conflicts in C
22、odes and Governmental Regulations. Presentationis word for word except for editorial changes.InterpretationsThe interpretation by the SDO (Standards Development Organization) of an identical standard shall bebased on the literal text to determine compliance with the standard in accordance with the p
23、roceduralrules of the SDO. If more than one interpretation of the literal text has been identified, a revision shall beproposed as soon as possible to each of the SDOs to more accurately reflect the intent.ANCE Effective DateThe effective date for ANCE will be announced through theDiario Oficial de
24、la Federation (Official Gazette)and is indicated on the cover page.AUGUST 11, 2005NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-54CSA Effective DateThe effective date for CSA will be announced through CSA Informs or CSA Certification Notice.UL Effective DateThis edition of the standard
25、 is now in effect.AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-5 5This page intentionally left blank.AUGUST 11, 2005NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-56AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 7Foreword (CSA) T
26、he Canadian Standards Association (CSA) develops standards under the name Canadian StandardsAssociation, and provides certification and testing under the name CSA International. CSA Internationalprovides certification services for manufacturers who, under license from CSA, wish to use the appropriat
27、eregistered 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-uponstandards of quality, performance, interchangeability and/or safety, as appropriate. Where applic
28、able,certification may form the basis for acceptance by inspection authorities responsible for enforcement ofregulations. Where feasible, programs will be developed for additional products for which certification isdesired by producers, consumers, or other interests. In performing its functions in a
29、ccordance with itsobjectives, CSA does not assume or undertake to discharge any responsibility of the manufacturer or anyother party. The opinions and findings of the Association represent its professional judgement given withdue consideration to the necessary limitations of practical operation and
30、state of the art at the time theStandard is processed. Products in substantial accord with this Standard but which exhibit a minor difference or a new feature maybe deemed to meet the Standard providing the feature or difference is found acceptable utilizingappropriate CSA International Operating Pr
31、ocedures. Products that comply with this Standard shall not becertified 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, tes
32、t procedures, and instrumentation frequently must be prescribed by CSAInternational in addition to the technical requirements contained in Standards of CSA. In addition tomarkings specified in the Standard, CSA International may require special cautions, markings, andinstructions that are not specif
33、ied by the Standard. Some tests required by CSA Standards may be inherently hazardous. The Association neither assumesnor 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
34、or the Association, andwhether or not any equipment, facility, or personnel for or in connection with the test is furnished by themanufacturer or the Association. Manufacturers should note that, in the event of the failure of CSA International to resolve an issue arisingfrom the interpretation of re
35、quirements, there is an appeal procedure: the complainant should submit thematter, 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 forcertification, to request all current Amend
36、ments, Bulletins, Notices, and Technical Information Letters thatmay be applicable and for which there may be a nominal charge. For such information or for furtherinformation concerning CSA Certification, please address your inquiry to Applications and CustomerService, CSA International, 178 Rexdale
37、 Boulevard, Toronto, Ontario, Canada M9W 1R3. This page intentionally left blank.AUGUST 11, 2005NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00 UL 248-58Low-Voltage Fuses Part 5: Class G Fuses1 GeneralNOTE This Part is intended to be read together with the Standard for Low-Voltage Fuses Part 1:
38、 General Requirements, hereafterreferred to as Part 1. The numbering of the Clauses in this Part correspond to like numbered Clauses in Part 1. The requirementsof Part 1 apply unless modified by this Part. For Clauses not shown below, refer to the Standard for Low-Voltage Fuses Part 1:General Requir
39、ements, NMX-J-009/248/5-2000-ANCE CAN/CSA C22.2 No. 248.1 UL 248-1.1.1 ScopeThis Part applies to Class G fuses rated 20 A or less, 600 V ac; 21 60 A, 480 V ac. DC ratings areoptional.4 ClassificationClass G fuses are non-renewable and current limiting, with an interrupting rating of 100,000 A. Class
40、 Gfuses are divided into four body sizes. The maximum current rating, In, for each size is specified in thisPart. Time-delay ratings are optional.5 Characteristics5.2 Voltage ratingFor AC, the rating shall be 600 V ac for the020Abody sizes, and 480 V ac for the 21 60 A bodysizes. The DC voltage rati
41、ng may be different from the AC rating.5.3 Current ratingRefer to Figure A for range of current ratings in each body size.5.5 Interrupting ratingFor AC 100,000 AFor DC, the preferred ratings are 10,000, 20,000, 50,000, or 100,000 A.AUGUST 11, 2005 NMX-J-009/248/5-2000-ANCE CAN/CSA-C22.2 NO. 248.5-00
42、 UL 248-5 95.6 Peak let-through current and clearing I2t characteristicsMaximum values of peak let-through current and clearing I2t at 100,000 A are given in Table A.Table A Maximum peak let-through current and clearing I2t for Class G fusesCurrent rating In, A Peak let-through current, A I2t, amper
43、e-squared seconds1 1,000 8003 1,500 1,2006 2,000 1,80010 3,000 2,80015 4,000 3,80020 5,000 5,00025 6,000 6,00030 7,000 7,00035 8,000 14,00040 8,500 17,00045 9,000 18,50050 9,500 21,00060 10,500 25,0007 Construction7.1 DimensionsFuse dimensions are shown in Figure A.This is generated text for figtxt.
44、AUGUST 1, 2000NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-510Figure A Dimensions of Class G fuses in mm (in)Current rating In,AOverall length of fuse Minimum length of ferruleOutside diameter offerruleAaBCb0 15 33.3 7.1 10.3(1.31) (0.28) (0.41)16 20 35.7 7.1 10.3(1.41) (0.28) (0.41)21 30
45、 41.3 7.1 10.3(1.62) (0.28) (0.41)31 60 57.2 12.7 10.3(2.25) (0.50) (0.41)aTolerance: 0.8 mm (0.03 in)bTolerance: 0.15 mm (0.006 in)AUGUST 1, 2000 NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-5 118 Tests8.2 Verification of temperature rise and current-carrying capacity8.2.3 Test Method1.0
46、 In Temperature rise1.1 In Current-carrying capacity, Inf8.2.3.1 Fuses rated 600 A or lessIn addition to the requirements in Part 1: At the conclusion of the temperature rise test, the test currentshall be increased without interruption to 1.1 Infor a period of not less than 15 min. Temperature is n
47、otto be monitored during this time.8.2.4 Acceptability of test resultsThe maximum temperature rise shall not exceed the following:Contacts 75C8.3 Verification of overload operationPart 1, Table 4Test 1 1.35 InTest32InTest42Infor time delay only (can be combined with Test 3)8.4 Verification of operat
48、ion at rated voltageFor AC Part 1, Table 5Test 2 Maximum energyTest 3 Threshold ratio. The maximum threshold ratio shall be 60.Test 4a 100 kATest 5b2InPeak let-through current and clearing I2t recorded during Test 4a.For DC Part 1, Table 6Test 1 Interrupting ratingTest 2 Maximum energyAUGUST 11, 200
49、5NMX-J-009/248/5-2000-ANCE CSA C22.2 NO. 248.5-00 UL 248-512Update No. 2 C22.2 No. 248.5-00 November 2004 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 5: Class G Fuses originally published August 2000 The following revisions have been formally approved: Revised Outside front cove
