ANSI CSA C22.2 NO.4248.1-7-2007 Fuseholders - Part 1 General Requirements (First Edition Update No 1 November 2007 Update No 2 October 2013).pdf

1、C22.2 No. 4248.1-07 (reaffirmed 2016)Fuseholders Part 1: General RequirementsLegalNoticeforStandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by theStandards Council of Canada. This process brings together volunteers repre

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17、 you are required to destroy them immediately. Use of thisdocument constitutes your acceptance of the terms and conditions of this Legal Notice.Update No. 2CAN/CSA-C22.2 No. 4248.1-07October 2013Note: For information about the Standards Update Service or if you are missing any updates, go to shop.cs

18、a.ca or e-mail techsupportcsagroup.org.Title: Fuseholders Part 1: General Requirements originally published February 2007Revisions issued: Update No. 1 November 2007The following revisions have been formally approved and are marked by a vertical line in the margin on the attached replacement pages:R

19、evised Title page, copyright page, Clauses 6.1.6, 7.5.1, 7.5.3, 7.5.5, 7.6.6, and 8.1.1.1, Table 7.1, and Annex BNew Clauses 2.1.7A and 6.1.7Deleted None Update your copy by inserting these revised pages.Keep the pages you remove for reference.Association of Standardization and CertificationNMX-J-00

20、9/4248/1-ANCEFirst EditionCSA GroupCAN/CSAC22.2 No. 4248.1-07First EditionUnderwriters Laboratories Inc.UL 4248-1First EditionFuseholders Part 1: General RequirementsFebruary 28, 2007(Title Page Reprinted: October 24, 2013)ANSI/UL 4248-1-2013Approved byCommitment for AmendmentsThis standard is issue

21、d jointly by the Association of Standardization and Certification (ANCE), theCanadian Standards Association (CSA), and Underwriters Laboratories Inc. (UL). Comments orproposals for revisions on any part of the standard may be submitted to ANCE, CSA, or UL at any time.Revisions to this standard will

22、be made only after processing according to the standards developmentprocedures of ANCE, CSA, and UL. CSA and UL will issue 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

23、 standard bearing the same date of issue as the CSA and UL pages.Copyright 2007 ANCERights reserved in favor of ANCE.ISBN 1-55436-050-1 2007 CSA GroupAll rights reserved. No part of this publication may be reproduced in any form whatsoever without theprior permission of the publisher.To purchase CSA

24、 Standards and related publications, visit CSAs Online Store at www.ShopCSA.caor call toll-free 18004636727 or 4167474044.Copyright 2013 Underwriters Laboratories Inc.Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time.Proposals should be submitted via

25、a Proposal Request in ULs On-Line Collaborative StandardsDevelopment System (CSDS) at http:/.ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standardshould be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regardingthose

26、 Standards shall remain the sole and exclusive property of UL.To purchase UL Standards, visit COMM 2000 at http:/m- call toll free 18888533503.The most recent designation of ANSI/UL 4248-1 as an American National Standard (ANSI) occurredon October 24, 2013. The ANSI approval for this standard does n

27、ot include the Cover Page, TransmittalPages, Title Page, Preface, or effective date information.The ANSI/UL Standard for Safety consists of the First Edition including revisions through October 24,2013.CONTENTSPreface .51 General 71.1 Scope .71.2 Object .71.3 Units of measurement .71.4 Undated refer

28、ence 72 Definitions 72.1 General .72.2 Ratings 92.3 Wiring terminals 93 Service conditions 94 Classification 105 Characteristics .105.1 Summary of characteristics .106 Marking .106.1 Marking of fuseholders .106.2 Marking symbols 117 Construction .127.1 Fuseholder components 127.2 Bases and supports

29、insulating material .127.3 Sealing .137.4 Current carrying parts 137.5 Wiring terminals .147.6 Contacts of cartridge fuseholders 157.7 Creepage and clearance .167.8 Open fuse indicator 168 Tests .168.1 General 168.2 Verification of electric shock protection (IEC 60529 IP Code) categories .178.3 Veri

30、fication of insulating materials .188.4 Verification of temperature rise 198.5 Verification of withstand rating 208.6 Open fuse indicating current test 23Annex A (Normative)A Standards for Components .24Annex B (Normative)B Referenced Standards .26Annex C (Informative)C End-use fuseholder spacings .

31、27OCTOBER 24, 2013 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-1 3Annex D (Informative)D Circuit calibration for verification of withstand rating test 28D1 Galvanometers .28D2 Circuit calibration .29D3 Alternating current circuits greater than 10,000 A .30FEBRUARY 28, 2007NMX-J-009/4248/1-

32、ANCE CSA C22.2 NO. 4248.1-07 UL 4248-14Fuseholders Part 1: General Requirements1 General1.1 Scope1.1.1 These fuseholders and devices accommodate fuses to be employed in electrical circuits and areintended to be used in accordance with the Canadian Electrical Code, Part I (CE Code Part I), CSA C22.1,

33、the National Electrical Code (NEC), ANSI/NFPA 70, or the Mexican Electrical Code, NOM-001.1.1.2 These requirements cover:a) fuseholders for fuses intended for use with fuse classes covered in the ANCE NMX-J-009-248; CSA C22.2 No. 248 and UL 248 series of standards, Parts 2, 3, 4, 5, 6, 7, 8, 9, 10,

34、11, 12,13, 14 and 15; andb) fuseholder accessories (such as covers, indicators, adapters, etc.).1.2 Object1.2.1 This Standard and its subsequent parts establish the characteristics, construction, operatingconditions, markings, and test conditions for fuseholders.1.3 Units of measurement1.3.1 The val

35、ues given in SI (metric) shall be normative. Any other values given shall be for informationpurposes only.1.4 Undated reference1.4.1 Any undated reference to a code or standard appearing in the requirements of this standard shallbe interpreted as referring to the latest edition of that code or stand

36、ard.1.4.2 When a reference is made to another code or standard, the product shall comply with the code orstandard of the country in which the product is intended to be used.1.4.3 In Canada, general requirements applicable to this standard are given in CSA C22.2 No. 0, GeneralRequirements Canadian El

37、ectrical Code, Part II.2 Definitions2.1 General2.1.1 Ambient temperature The temperature of the air (or medium) surrounding the fuseholder.2.1.2 Available fault current The maximum current that the power system can deliver through a givencircuit point to any negligible impedance short-circuit applie

38、d at that point.2.1.3 Clearance The shortest distance in air between two conductive parts.2.1.4 Contacts The parts of the fuseholder that provide electrical contact between the fuse (fuse-link)and the fuseholder.FEBRUARY 28, 2007 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-1 72.1.5 Creepag

39、e The shortest distance along the surface of the insulating material between twoconductive parts.2.1.6 Dummy fuse A device used during the verification of temperature rise test and the withstandtest, as defined in the subsequent parts.2.1.7 Enclosed fuseholder An insulated enclosure that holds, supp

40、orts, and surrounds the fuse. Anyexposed terminals are typically inaccessible from the outside of equipment after installation.Note: Types of enclosed fuseholders include: panel mount, in-line, and modular fuseholders.2.1.7A Ferrous A compound or alloy of iron. For the purpose of this Standard, comp

41、ounds or alloyspredominantly of copper or other metals but containing an insignificant amount of iron are considerednon-ferrous.2.1.8 Fuseholder A device that:a) provides mechanical support for a fuse;b) maintains creepage and clearance for a fuse;c) provides means to connect a fuse in a circuit; an

42、dd) allows for fuse replacement.2.1.9 Fuse-link/Fuse A protective device that opens a circuit during specified overcurrent conditionsby means of a current responsive element.2.1.10 In-line fuseholder A type of enclosed fuseholder that is in-line with the application wiring andhas two halves. The fus

43、e remains in the load side housing when the two halves are separated.2.1.11 Live parts Conductive parts that are intended to operate at a potential different from that of theearth.2.1.12 Open fuse indicator A means to indicate that a fuse has operated.2.1.13 Panel mount fuseholder A type of enclosed

44、 fuseholder that mounts through a panel andincludes a removable fuse carrier. The carrier extends outside the panel and contains the fuse. Thehousing is located behind the panel. Line and load side terminals are located behind the panel as well.The housing is secured to the panel.2.1.14 Rejection me

45、mber A means to prevent the installation of any fuse other than that for which thefuseholder is intended.OCTOBER 24, 2013NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-186.1.2 A fuseholder with wiring terminals intended and found acceptable for use with copper and aluminumconductors shall be

46、marked in a readily visible location Use copper or aluminum wire, or “CU-AL” orequivalent.6.1.3 A fuseholder with terminals intended and found acceptable for copper wire only shall be marked ina readily visible location USE COPPER WIRE ONLY or with the abbreviation CU ONLY.Iftheterminals are intende

47、d and found acceptable for aluminum wire only, the marking shall be USEALUMINUM WIRE ONLY,orAL ONLY.6.1.4 A fuseholder shall be marked in a readily visible location to indicate the required insulationtemperature rating and size or range of sizes of all field-installed conductors. A fuseholder rated

48、100 A orless and evaluated for use with both 60C and 75C rated conductors may be marked 60/75C. SeeClause 8.5.1.In the United States, the following applies: A fuseholder rated 100 A having a terminal intended to securea maximum 1 AWG (42.4 mm2) conductor, if marked as being acceptable for aluminum w

49、ire inaccordance with Clause 6.1.2 or 6.1.3 shall also be marked FOR ALUMINUM USE 1 AWG, 75C WIREONLY.6.1.5 If the relative arrangement of terminals for the connection of conductors is such that the terminalsfor any one circuit are not readily evident, such terminals shall be identified by a marking.6.1.6 With respect to the requirement in Clause 7.5.5, a fuseholder shall be marked to indicate thespecific tightening torque in Nm for each wire connector in the fuseh