1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 248-1 Low-Voltage Fuses Part 1: General RequirementsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTH
2、ORIZED 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 This revision of ANSI/UL 2481 is being issued to reaffirm approval as an American National Standard. No changes in
3、requirements are involved. As noted in the Commitment for Amendments statement located on the back side of the title page, UL, CSA, and ANCE are committed to updating this harmonized standard jointly. However, the revision pages dated (June 26, 2015) will not be jointly issued by UL, CSA, and ANCE a
4、s these revision pages only address UL 2481 ANSI approval dates. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
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9、except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated on this transmittal notice. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are prec
10、eded by a SUPERSEDED REQUIREMENTS notice. AUGUST 18, 2015 UL 248-1 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 18, 2015 UL 248-1 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIB
11、UTION 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 248-1 Third Edition Low-Voltage Fuses Part 1: General Requirements May 13, 2011 (T
12、itle Page Reprinted: August 18, 2015) ANSI/UL 248-1-2011 (R2015)UL COPYRIGHTED 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 Canad
13、ian 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 this standard will be made only after processing according to the standar
14、ds 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 revisions into a new edition of the standard bearing the same date of issu
15、e as the CSA Group and UL pages. Copyright 2011 ANCE Rights reserved in favor of ANCE. ISBN 978-1-55491-642-9 2011 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. CSA Standards are subject to periodic
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19、Third Edition including revisions through August 18, 2015. The most recent designation of ANSI/UL 248-1 as an American National Standard (ANSI) occurred on August 18, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. C
20、omments 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:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free
21、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 .7 2 Denitions 7 2.1 Fuse 7 2.2 General terms 8 2.3 Characteristic quantities 10 3 Service conditions .12 4 Classication 1
22、2 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 current and clearing I 2 t characteristics 13 6 Marking .13 6.1 Marking of fuses 13 6.2 Marking symbols 14 7 Construction .
23、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 General 15 8.2 Verication of temperature rise and current-carrying capacity .17 8.3 Verication of overload operation 20 8.4 Veri
24、cation 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 interrupting rating tests A1 Galvanometers .27 A2 Circuit calibration .28 A3 DC circuit calibration example 30 MAY 13, 2011 NMX-J-009
25、/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) Instrumentation for interrupting rating tests B1 Power factor determination 32 B2 Available current .34 B3 Peak let-through curr
26、ent .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. 248.1-11 UL 248-1 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL P
27、reface 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 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 edi
28、tion 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 Standardization and Certication (ANCE), the Canadian Standards Association (CSA), and Underwriters Laboratories Inc., (UL). Th
29、is 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 Asociacion de Normalizacion y Certicacion, A.C., CONANCE, with the collaboration of the fuse ma
30、nufacturers 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 Committee on Requirements for Electrical Safety, and has been formally approved by the CSA T
31、echnical Committee. 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 revisions, all of which are itemized on the transmittal notice that accompanies the lat
32、est set of revised requirements. Where reference is made to a specic number of samples 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 respons
33、ibility 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 standard that is exactly the same in technical content except for national differen
34、ces 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 identical or equivalent standard is based on the literal text to determine compliance with
35、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 to each of the standards development organizations to more accurately reect the inte
36、nt. MAY 13, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ANCE Effective Date The effective date for ANCE will be announced through the Diario Ocial de la Federacin (Official Gazet
37、te) and is indicated on the cover page. 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 August 22, 2011 all products Listed or Recognized by UL must comply with the requirements in this standard. A
38、 UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard. AUGUST 22, 2011 NMX-J-009/248/1-ANCE CSA C22.2 NO. 248.1-11 UL 248-1 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Low-
39、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 I(
40、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 p
41、erformed 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: Low-
42、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 supports
43、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 f
44、use. 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 Ren
45、ewal 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 the
46、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 Low
47、 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 UL
48、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 MA
49、TERIAL 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 Plug 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
