1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-1 Fuseholders Part 1: General Requirements STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MA
2、TERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fuseholders Part 1: General Requirements UL 4248-1 Second Edition, Dated October 13, 2017 Summary of Topics The second edition of the Standard for Safety for Fuseholders - Part 1: Gen
3、eral Requirements, UL 4248-1, has been issued to reect the latest ANSI approval date, and to incorporate the following proposals: Withstand rating on supplemental fuseholders. Clarication of the insulating material requirements in Table 7.1 of Clause 7.2. Addition of requirements for “Specic Use Fus
4、eholders”. Clarication of the marked voltage rating. Addition of ambient temperature correction and allowance for repeated test. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated April 7, 2017, August 4, 2017 and August 11, 2017. All rights reser
5、ved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or im
6、plied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the
7、 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 damage. 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 v
8、ersions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on t
9、he purchasers computer system. OCTOBER 13, 2017 UL 4248-1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 13, 2017 UL 4248-1 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION W
10、ITHOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-009/4248/1-ANCE Second Edition CSA Group CSA C22.2 No. 4248.1 Second Edition Underwriters Laboratories Inc. UL 4248-1 Second Edition Fuseholders Part 1: General Requirements October 13, 2017 ANSI/UL 4248-12017UL COPYRIGHT
11、ED 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), CSA Group, and Underwriters Laboratories Inc. (UL). Comments or proposals for revisio
12、ns 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 means of a new edition or revised
13、 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 2017 ANCE Rights reserved in favor of ANCE. ISBN 978-1-4883-1311-0 2017 CSA Group All rights reserved. No pa
14、rt of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. This Standard is subject to review ve years from the date of publication, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change,
15、 please send the following information to inquirescsagroup.org and include Proposal for change in the subject line: Standard designation (number); relevant clause, table, and/or gure number; wording of the proposed change; and rationale for the change. To purchase CSA Group Standards and related pub
16、lications, visit CSA Groups Online Store at shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044. Copyright 2017 Underwriters Laboratories Inc. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standar
17、ds and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. The most recent designation of ANSI/UL 4248-1-2017 as an American National Standard (ANSI) occurred on October 13, 2017. ANSI approval for a standard does not include the Cover
18、 Page, Transmittal Pages, 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 time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/.
19、 To purchase UL Standards, visit ULs Standards Sales Site at http:/ HowToOrder.aspx or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS Preface . 5 1 General 6 1.1 Scope .6 1.2 Object .6 1.3 Units of mea
20、surement .6 1.4 Undated reference 6 2 Denitions 6 2.1 General .6 2.2 Ratings 8 2.3 Wiring terminals 8 3 Service conditions 9 4 Classication .9 5 Characteristics 9 5.1 Summary of characteristics 9 6 Marking .10 6.1 Marking of fuseholders .10 6.2 Marking symbols 11 7 Construction .11 7.1 Fuseholder co
21、mponents 11 7.2 Bases and supports insulating 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
22、(IEC 60529 IP Code) categories .17 8.3 Verication 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
23、 (Informative) C End-use fuseholder spacings .28 OCTOBER 13, 2017 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1 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 r
24、ating test 29 D1 Galvanometers .29 D2 Circuit calibration .30 D3 Alternating current circuits greater than 10,000 A .31 OCTOBER 13, 2017 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1 UL 4248-1 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Pr
25、eface This is the harmonized ANCE, CSA Group, and UL standard for Fuseholders Part 1: General Requirements. It is the second edition of NMX-J-009/4248/1-ANCE, the second edition of CSA C22.2 No. 4248-1, and the second edition of UL 4248-1. This edition of NMX-J-009/4248/1-ANCE supersedes the previou
26、s edition published on February 28, 2007. This edition of CSA C22.2 No. 4248-1 supersedes the previous edition published on February 28, 2007. This edition of UL 4248-1 supersedes the previous edition published on February 28, 2007. This harmonized standard was prepared by the Association of Standar
27、dization and Certication, (ANCE), CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Technical Harmonization Subcommittee 32B Fuseholders, on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged. This stan
28、dard is considered suitable for use for conformity assessment within the stated scope of the standard. This standard was reviewed by the CSA Subcommittee on Fuses and Fuseholders, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on
29、 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. Application of Standard Where reference is made to a specic number of samples to b
30、e tested, the specied number is to be considered a minimum quantity. Note: Although 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.
31、 Level of harmonization This standard is published as an identical standard for ANCE, CSA Group 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
32、 for word except for editorial changes. Interpretations The interpretation by the standards 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 orga
33、nization. If more than one interpretation of the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. OCTOBER 13, 2017 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1 UL 4248-1 5UL COPYRIGH
34、TED 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
35、Canadian 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 a
36、nd 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
37、 test 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 s
38、hall 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
39、 to 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 del
40、iver through a given circuit point to any negligible impedance short-circuit applied at that point. OCTOBER 13, 2017 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1 UL 4248-1 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.1.3 Clearance The sh
41、ortest 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. 2.1.5 Creepage The shortest distance along the surface of the insulating material between two conductive parts. 2.1.6 Dummy
42、 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 a
43、fter installation. Note: Types of enclosed fuseholders include: panel mount, in-line, and modular fuseholders. 2.1.8 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 con
44、sidered non-ferrous. 2.1.9 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. 2.1.10 Fuse-link/Fuse A protective device that opens a circuit during
45、specied overcurrent conditions by means of a current responsive element. 2.1.11 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. 2.1.12 Live parts Conductive p
46、arts that are intended to operate at a potential different from that of the earth. 2.1.13 Open fuse indicator A means to indicate that a fuse has operated. 2.1.14 Panel mount fuseholder A type of enclosed fuseholder that mounts through a panel and includes a removable fuse carrier. The carrier exten
47、ds outside the panel and contains the fuse. The housing is located behind the panel. Line and load side terminals are located behind the panel as well. The housing is secured to the panel. OCTOBER 13, 2017 NMX-J-009/4248/1-ANCE CSA C22.2 NO. 4248.1 UL 4248-1 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED F
48、OR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.1.15 Rejection member A means to prevent the installation of any fuse other than that for which the fuseholder is intended. 2.1.16 Specic use fuseholder A fuseholder having special features limiting their suitability to particular
49、applications. 2.2 Ratings 2.2.1 Rating A designated limit of operating characteristics based on specied conditions, such as current, voltage, frequency. 2.2.2 Current rating The maximum ampere rating, based on specied conditions, that is assigned to a fuseholder. Note: Each fuseholder can accommodate a range of fuses based on their body size, such as 31 60 for 60 A body size. 2.2.3 Short-circuit
