1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-1 Low-Voltage Fuses Part 1: General Requirements STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHT
2、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-Voltage Fuses - Part 1: General Requirements UL 248-1 Third Edition, Dated May 13, 2011 Summary of Topics Revision pages have been issued for the Standard for Safety for Low-Voltage Fuses Part 1: Gener
3、al Requirements, UL 248-1, to incorporate the following proposals: Editorial correction in Table 5. Recovery voltage clarication. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new/revised requirements are su
4、bstantially in accordance with Proposal(s) on this subject dated March 24, 2017. 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, mechanical photocopying, recording, or otherwise without prior permi
5、ssion 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 any special, incidental, consequential, indirect or similar dama
6、ges, 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 damage. In no event shall ULs liability for any damage ever exceed
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8、ing from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JUNE 16, 2017 UL 248-1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 16, 2017 UL 248-1 tr2 No Text on T
9、his PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-009/248/1-ANCE Second Edition Canadian Standards Association CSA C22.2 No. 248.1-11 Third Edition Underwriters Laboratories Inc. UL
10、248-1 Third Edition Low-Voltage Fuses Part 1: General Requirements May 13, 2011 (Title Page Reprinted: June 16, 2017) ANSI/UL 248-1-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly
11、 by the Association of Standardization and Certication (ANCE), the Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to ANCE, CSA Group, or UL at anytime. Revisions to t
12、his standard will be made only after processing according to the standards development procedures of ANCE, CSA Group, and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ANCE will incorporate the same re
13、visions into a new edition of the standard bearing the same date of issue as the CSA Group and UL pages. Copyright 2017 ANCE Rights reserved in favor of ANCE. ISBN 978-1-55491-642-9 2017 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the p
14、rior 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, please send the following information to inquirescsagroup.org and include Pr
15、oposal 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 publications, visit CSA Groups Online Store at shop.csa.ca or call toll-free 1-8
16、00-463-6727 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 Standards and all copyrights, ownerships, and rights regarding those Standards shall
17、 remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Third Edition including revisions through June 16, 2017. The most recent designation of ANSI/UL 248-1 as an American National Standard (ANSI) occurred on June 16, 2017. ANSI approval for a standard does n
18、ot include the Cover 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 Syste
19、m (CSDS) at https:/. 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 7 1.1 Scope .7 1.2 Object
20、 .7 2 Denitions .7 2.1 Fuse .7 2.2 General terms 8 2.3 Characteristic quantities 10 3 Service conditions .12 4 Classication 12 5 Characteristics 12 5.1 Summary of Characteristics .12 5.2 Voltage rating .13 5.3 Current rating .13 5.4 Frequency rating 13 5.5 Interrupting rating 13 5.6 Peak let-through
21、 current and clearing I 2 t characteristics 13 6 Marking 13 6.1 Marking of fuses .13 6.2 Marking symbols 14 7 Construction 14 7.1 Dimensions .14 7.2 Current-carrying parts 14 7.3 Connections 14 7.4 Adhesives 14 7.5 Contact alignment .15 7.6 Body .15 7.7 Corrosion protection .15 8 Tests 15 8.1 Genera
22、l .15 8.2 Verication of temperature rise and current-carrying capacity .17 8.3 Verication of overload operation 20 8.4 Verication of operation at rated voltage 21 8.5 Verication of peak let-through current and clearing I 2 t characteristics .26 ANNEX A (normative) Circuit calibration for interruptin
23、g rating tests A1 Galvanometers .27 A2 Circuit calibration .28 A3 DC circuit calibration example 30 MAY 13, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ANNEX B (normative) Instru
24、mentation for interrupting rating tests B1 Power factor determination 32 B2 Available current 34 B3 Peak let-through current .34 B4 Recovery voltage .36 B5 Comparison of instrumentation .39 B6 Determination of I 2 t .39 B7 Oscillogram example 39 MAY 13, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-
25、11 UL 248-1 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Preface This is the harmonized ANCE, CSA, and UL standard for Low-Voltage Fuses Part 1: General Requirements. It is the second edition of NMX-J-009/248/1-ANCE, the third edition of
26、 CSA C22.2 No. 248.1-11, and the third edition of UL 248-1. This edition of NMX-J-009-248/1-ANCE cancels the previous edition published in 2000. This edition of CSA C22.2 No. 248.1-11 supersedes the previous edition published in 2000. This harmonized standard was prepared by the Association of Stand
27、ardization and Certication, (ANCE), CSA Group and Underwriters Laboratories Inc. (UL). This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard. The present Mexican Standard was developed by the CT 32 from the Comite de Normalizacion de la Asocia
28、cion de Normalizacion y Certicacion, A.C., CONANCE, with the collaboration of the fuse manufacturers and users. 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 Com
29、mittee on 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 sam
30、ples to be 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
31、 purpose. 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. Presentatio
32、n is word 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 develop
33、ment organization. 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. JUNE 16, 2017 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 5UL CO
34、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 16, 2017 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 6 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Lo
35、w-Voltage Fuses Part 1: General Requirements 1 General 1.1 Scope 1.1.1 This Standard applies to low-voltage fuses rated 1000 V or less, AC and/or DC, with interrupting ratings up to 300 kA (200 kA for Mexico). These fuses are intended to be used in accordance with the Canadian Electrical Code, Part
36、I(CEC), and the National Electrical Code, NFPA 70 (NEC). 1.2 Object 1.2.1 This Standard and its subsequent Parts establish the characteristics, construction, operating conditions, markings, and test conditions for each of the fuse classes so that initial investigation and follow-up verication can be
37、 performed in an orderly manner. 2 Denitions The following denitions apply in this Standard. Note: The Clauses in Denitions, Clause 2, are numbered corresponding to the Clause numbers for denitions for the similar items contained in the International Electrotechnical Commission Publication 269-1: Lo
38、w-voltage fuses, Part 1: General requirements. Some Clause numbers are omitted. 2.1 Fuse 2.1.3 Fuse A protective device which opens a circuit during specied overcurrent conditions by means of a current responsive element. 2.1.3.1 Body The part of the fuse which encloses the fuse elements and support
39、s the contacts. Also referred to as cartridge, tube, or case. AUGUST 22, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.1.3.2 Filler Material used to ll a section or sections of a
40、 fuse. 2.1.4 Contacts The external metallic parts of the fuse used to complete the circuit. Also referred to as ferrules, caps, blades, or terminals. 2.1.5 Element The fusible portion of the fuse which acts, during an overcurrent condition, to clear the circuit; also referred to as a link. 2.1.5.1 R
41、enewal element The part of a renewable fuse that is replaced after interruption to restore the fuse to operating condition. 2.2 General terms 2.2.2 Current-limiting fuse A fuse that, within a specied overcurrent range, limits the clearing time at rated voltage to an interval equal to or less than th
42、e rst major or symmetrical current loop duration; and limits the peak current to a value less than the available peak current. 2.2.5.1 Ambient air temperature The temperature of the air surrounding the fuse. Measurement of the ambient air temperature is conducted according to Clause 8.1.2. 2.2.7.1 L
43、ow melting point fuse A fuse that will open in an ambient air temperature of 200C when carrying 10 percent of rated current. AUGUST 22, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U
44、L 2.2.7.2 Microfuse A supplemental fuse, the body of which has no principal dimension exceeding 10 mm (0.4 in), excluding the leads or terminals. Note: Principal dimensions are length, width, height, and diameter. AUGUST 22, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 8AUL COPYRIGHTED
45、MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 22, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 8B No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2.7.3 P
46、lug fuse A screw-in type fuse for use in an Edison Base, Type C tamper-proof, or Type S tamper-proof fuseholder. 2.2.7.4 Renewable fuse A fuse which can be restored for service, after interruption, by the replacement of the renewal elements. 2.2.7.5 Supplemental fuse A fuse intended only for supplem
47、entary overcurrent protection where branch-circuit protection is not required. 2.2.7.6 Time-delay fuse A fuse capable of carrying a specied overcurrent for a specied minimum time. Time-delay characteristics are veried by the overload and operation tests in the relevant subsequent Parts for certain f
48、use classes. 2.2.7.7 Branch circuit fuse A fuse which is suitable for protection of distribution systems, wiring, or equipment. Examples of branch circuit fuses are Classes R, J, L, T, and CC. A supplemental fuse, intended to protect equipment only, is not a branch circuit fuse. 2.2.8 Body size The
49、specied set of dimensions of fuses within a fuse class or system. Each individual size covers a given range of rated currents for which the specied dimensions of the fuse remain unchanged. 2.2.9 Homogeneous series of fuses A series of fuse current ratings, within a given body size and of similar construction, such that one of the ratings of the series may be taken as representative of the series itself. MAY 13, 2011 NMX-J-0
