UL 4248-1-2007 UL Standard for Safety Fuseholders - Part 1 General Requirements (First Edition Reprint with revisions through and including October 24 2013)《熔断器固定件 第1部分 一般要求》.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-1 Fuseholders Part 1: General RequirementsUL 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 Fuseholders Part 1: General Requirements UL 4248-1 First Edition, Dated February 28, 2007 Summary of Topics The revision to ANSI/UL 4248-1 include the following changes in requirements: Revision to clari

3、fy the term “ferrous”. Revision to address the specication of torque values. Revision to include UL 486E as a reference in Appendix B. Revision to correct a typographical error in Clause 7.5.3. Revision to specify the fuse shall be retained in the load side of the fuseholder. Alternatives for the ev

4、aluation of the adequacy of surface tracking characteristics of polymeric materials used in fuseholders rated 600 volts but 35 kV Introduction of exception to requirement for withstand testing. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a

5、vertical line in the margin. The revised requirements are substantially in accordance with Proposal(s) on this subject dated December 23, 2011. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mecha

6、nical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for a

7、ny special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such dam

8、age. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage,

9、claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, an

10、d/or other elements of the Standard having future effective dates as indicated in the preface. 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 SUPERSEDED REQUIREMENTS notice. OCTOBER 24, 2013 UL 4248-1

11、 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 24, 2013 UL 4248-1 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Association of Standardization

12、and Certication NMX-J-009/4248/1-ANCE First Edition CSA Group CAN/CSAC22.2 No. 4248.1-07 First Edition Underwriters Laboratories Inc. UL 4248-1 First Edition Fuseholders Part 1: General Requirements February 28, 2007 (Title Page Reprinted: October 24, 2013) ANSI/UL 4248-1-2013 Approved byUL COPYRIGH

13、TED 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 Association (CSA), and Underwriters Laboratories Inc. (UL). C

14、omments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA, or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedures of ANCE, CSA, and UL. CSA and UL will issue revisions to this standard by m

15、eans 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 and UL pages. Copyright 2007 ANCE Rights reserved in favor of ANCE. ISBN 1-55436-050-1 2007 CSA Grou

16、p All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. To purchase CSA Standards and related publications, visit CSAs Online Store at www.ShopCSA.ca or call toll-free 18004636727 or 4167474044. Copyright 2013 Underwr

17、iters 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 a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL.

18、 Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. To purchase UL Standards, visit COMM 2000 at http:/m- or call toll free 188

19、88533503. The most recent designation of ANSI/UL 4248-1 as an American National Standard (ANSI) occurred on October 24, 2013. The ANSI approval for this standard does not include the Cover Page, Transmittal Pages, Title Page, Preface, or effective date information. The ANSI/UL Standard for Safety co

20、nsists of the First Edition including revisions through October 24, 2013.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface .5 1 General 7 1.1 Scope .7 1.2 Object .7 1.3 Units of measurement .7 1.4 Undated reference 7 2 Denitio

21、ns 7 2.1 General .7 2.2 Ratings 9 2.3 Wiring terminals 9 3 Service conditions 9 4 Classication 10 5 Characteristics .10 5.1 Summary of characteristics .10 6 Marking .10 6.1 Marking of fuseholders .10 6.2 Marking symbols 11 7 Construction .12 7.1 Fuseholder components 12 7.2 Bases and supports insula

22、ting material .12 7.3 Sealing .13 7.4 Current carrying parts 13 7.5 Wiring terminals .14 7.6 Contacts of cartridge fuseholders 15 7.7 Creepage and clearance .16 7.8 Open fuse indicator 16 8 Tests .16 8.1 General 16 8.2 Verication of electric shock protection (IEC 60529 IP Code) categories .17 8.3 Ve

23、rication of insulating materials .18 8.4 Verication of temperature rise 19 8.5 Verication of withstand rating 20 8.6 Open fuse indicating current test 23 Annex A (Normative) A Standards for Components .24 Annex B (Normative) B Referenced Standards .26 Annex C (Informative) C End-use fuseholder spaci

24、ngs .27 OCTOBER 24, 2013 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-1 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Annex D (Informative) D Circuit calibration for verication of withstand rating test 28 D1 Galvanometers .28 D2

25、Circuit calibration .29 D3 Alternating current circuits greater than 10,000 A .30 FEBRUARY 28, 2007 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-1 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the common ANCE, CSA

26、, and UL standard for Fuseholders Part 1: General Requirements. It is the rst edition of NMX-J-009/4248/1-ANCE, the rst edition of CSA C22.2 No. 4248-1, and the rst edition of UL 4248-1. This common standard was prepared by the Association of Standardization and Certication (ANCE), the Canadian Stan

27、dards Association (CSA), and Underwriters Laboratories Inc. (UL). The efforts and support of the CANENA Technical Harmonization Subcommittee 32B Fuseholders are gratefully appreciated. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. Thi

28、s standard was reviewed by the CSA Subcommittee on Low voltage fuses, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This stand

29、ard will be submitted to the Standards Council of Canada for approval as a National Standard of Canada. This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. A UL standard is current only if it incorporates the most recently adopted rev

30、isions, 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 shall be considered a minimum quantity. Note: Although the intended primary application of this

31、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 for ANCE, CSA, and UL. An identical standard is a

32、 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 standards development organization of an identic

33、al 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 revision is to be proposed as soon as possible

34、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 Ia Federacin (Official Gazette) and is indicated on the cover page. FEBRUARY 28, 2007 NMX-J-009/4248/1-ANCE CSA C22.2

35、NO. 4248.1-07 UL 4248-1 5UL 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 effective date As of November 2, 2009

36、all products Listed or Recognized by UL must comply with the requirements in this standard. Between February 28, 2007 and November 2, 2009, new product submittals to UL may be evaluated under all requirements in this standard or, if requested in writing, evaluated under presently effective requireme

37、nts only. The presently effective requirements are contained in the tenth edition of UL 512. A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. JANUARY 31, 2008 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-1 6UL COPYRIGHTE

38、D MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Fuseholders Part 1: General Requirements 1 General 1.1 Scope 1.1.1 These fuseholders and devices accommodate fuses to be employed in electrical circuits and are intended to be used in accordance with the Ca

39、nadian Electrical Code, Part I (CE Code Part I), CSA C22.1, 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

40、 UL 248 series of standards, Parts 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15; and b) fuseholder accessories (such as covers, indicators, adapters, etc.). 1.2 Object 1.2.1 This Standard and its subsequent parts establish the characteristics, construction, operating conditions, markings, and t

41、est conditions for fuseholders. 1.3 Units of measurement 1.3.1 The values given in SI (metric) shall be normative. Any other values given shall be for information purposes only. 1.4 Undated reference 1.4.1 Any undated reference to a code or standard appearing in the requirements of this standard sha

42、ll be interpreted as referring to the latest edition of that code or standard. 1.4.2 When a reference is made to another code or standard, the product shall comply with the code or standard of the country in which the product is intended to be used. 1.4.3 In Canada, general requirements applicable t

43、o this standard are given in CSA C22.2 No. 0, General Requirements Canadian Electrical Code, Part II. 2 Denitions 2.1 General 2.1.1 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 deliv

44、er through a given circuit point to any negligible impedance short-circuit applied 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. FEB

45、RUARY 28, 2007 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1-07 UL 4248-1 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.1.5 Creepage The shortest distance along the surface of the insulating material between two conductive parts. 2.1.6 Dum

46、my fuse A device used during the verication of temperature rise test and the withstand test, as dened in the subsequent parts. 2.1.7 Enclosed fuseholder An insulated enclosure that holds, supports, and surrounds the fuse. Any exposed terminals are typically inaccessible from the outside of equipment

47、 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, compounds or alloys predominantly of copper or other metals but containing an insignicant amount of iron are

48、considered non-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; and d) allows for fuse replacement. 2.1.9 Fuse-link/Fuse A protective device that opens a circuit durin

49、g specied overcurrent conditions by 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 and has two halves. The fuse 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 the earth. 2.1.12 Open fuse indicator A means