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1、UL 248-10 ISBN 0-7629-0560-3 Low-Voltage Fuses Part 10: Class L Fuses Underwriters Laboratories Inc. (UL) 333 Pfi ngsten Road Northbrook, IL 60062-2096 UL Standard for Safety for Low-Voltage Fuses Part 10: Class L Fuses, UL 248-10 Second Edition, Dated August 1, 2000 The master for this Standard at
2、ULs Northbrook Office is the official document insofar as it relates to a UL service and the compliance of a product with respect to the requirements for that product and service, or if there are questions regarding the accuracy of this Standard. ULs Standards for Safety are copyrighted by UL. Neith
3、er a printed copy of a Standard, nor the distribution diskette for a Standard-on-Diskette and the fi le for the Standard on the distribution diskette should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and excl
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11、rsion electronic Standard was purchased, one copy of this Standard may be stored on the hard disk of a single personal computer, or on a single LAN fi le-server or the permanent storage device of a multiple-user computer in such a manner that this Standard may only be accessed by one user at a time
12、and for which there is no possibility of multiple concurrent access. AUGUST 1, 2000 UL 248-10tr1 If a multiple-user version electronic Standard was purchased, one copy of the Standard may be stored on a single LAN fi le-server, or on the permanent storage device of a multiple-user computer, or on an
13、 Intranet server. The number of concurrent users shall not exceed the number of users authorized. Electronic Standards are intended for on-line use, such as for viewing the requirements of a Standard, conducting a word search, and the like. Only one copy of the Standard may be printed from each sing
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15、py obtained by a purchaser may not look exactly like the on-line screen view or the printed Standard. An employee of an organization purchasing a UL Standard can make a copy of the page or pages being viewed for their own fair and/or practical internal use. The requirements in this Standard are now
16、in effect, except for those paragraphs, sections, tables, fi gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after
17、 the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. New product submittals made prior to a specifi ed future effective date will be judged under all of the requirements in this Standard including those requirements with a specifi ed future effective date, unless the applicant specif
18、i cally requests that the product be judged under the current requirements. However, if the applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing, Recognition, and Follow-Up Services after the
19、effective date, and understanding of this should be signifi ed in writing. Copyright 2000 Underwriters Laboratories Inc. This Standard consists of pages dated as shown in the following checklist: PageDate 1-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . August 1, 2000 AUGUST 1, 2000 UL 248-10tr2 LOW-VOLTAGE FUSES PART 10: CLASS L FUSES August 1, 2000 CSA International CSA C22.2 No. 248.10-00 Second Edition Underwriters Laboratories Inc. UL 248-10 Second Edition National Association of Stan
21、dardization and Certifi cation of the Electrical Sector NMX-J-009/248/10-2000-ANCE First Edition Commitment for Amendments This Standard is issued jointly by the National Association of Standardization and Certifi cation of the Electrical Sector (ANCE), CSA International, and Underwriters Laboratori
22、es Incorporated (UL). Amendments to this Standard will be made only after processing according to the Standards writing procedures by ANCE, CSA, and UL. Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it inc
23、orporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements. Copyright 2000 ANCE Rights reserved in favor of ANCE ISBN 1-55324-244-0 Copyright 2000 CSA International All rights reserved. No part of this pu
24、blication may be reproduced in any form whatsoever without the prior permission of the publisher. ISBN 0-7629-0560-3 Copyright 1994, 2000 Underwriters Laboratories Inc. CONTENTS Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Foreword (ANCE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Foreword (CSA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Foreword (UL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 1 General . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 1.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 4 Classifi
28、cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 5 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . .9 5.2 Voltage rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 5.3 Current rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . .9 5.5 Interrupting rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 5.6 Peak let-through current and clearing I2t characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 6 Markin
31、g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 7 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、 . . . . . . . . .10 7.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 7.2 Current-carrying parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . . . .10 8 Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 8.2 Verifi cation of temperature rise and current-carrying capacity . . . . . . . . . . . . . . . . . . . . . . .13
34、 8.3 Verifi cation of overload operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 8.4 Verifi cation of operation at rated voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 8.5 Verifi cation of peak let
35、-through current and clearing I2t characteristics . . . . . . . . . . . . . . .14 AUGUST 1, 2000NMX-J-009/248/10-2000-ANCE CSA C22.2 NO. 248.10-00 UL 248-103 Preface This is the common UL, CSA, and ANCE Standard forLow-Voltage Fuses Part 10: Class L Fuses. This is the second edition of CSA C22.2 No.
36、 248.10-00 (superseding the fi rst edition, published in 1994), the second edition of UL 248-10, and the fi rst edition of NMX-J-009/248/10-2000-ANCE. This Standard was prepared by a Technical Harmonization Committee comprised of members from Underwriters Laboratories, CSA International, the Nationa
37、l Association of Standardization and Certifi cation of the Electrical Sector, the end product manufacturers, and material suppliers. The efforts and support of the members of the Technical Harmonization Committee are gratefully acknowledged. This Standard was reviewed by the CSA Subcommittee of Fuse
38、s and approved by the Technical Committee on Industrial Products under the jurisdiction of the CSA Strategic Resource Group. This Standard will be submitted to the American National Standards Institute (ANSI) for publication as an American National Standard. Note: Although the intended primary appli
39、cation 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 purpose. Level of Harmonization This trinational standard is published as an Identical Standard. An identical standard is a stand
40、ard that is the same in technical content except for confl icts in Codes and Governmental Regulations. Presentation is word for word except for editorial changes. Interpretations The interpretation by the SDO (Standards Development Organization) of an identical standard shall be based on the literal
41、 text to determine compliance with the standard in accordance with the procedural rules of the SDO. If more than one interpretation of the literal text has been identifi ed, a revision shall be proposed as soon as possible to each of the SDOs to more accurately refl ect the intent. UL Effective Date
42、 This edition of the standard is now in effect. CSA Effective Date The effective date for CSA will be announced through either aCSA Informsor CSA Certifi cation Notice. ANCE Effective Date The effective date for ANCE will be announced through the Diario Ofi cial de la Federation (Official Gazette)an
43、d is indicated on the cover page. AUGUST 1, 2000NMX-J-009/248/10-2000-ANCE CSA C22.2 NO. 248.10-00 UL 248-104 Foreword (ANCE) The Present Mexican Standard was developed by the Low Voltage Fuses Subcommittee from the Comite de Normalizacion de la Asociacion Nacional de Normalizacion y Certifi cacion
44、del Sector Electrico, A.C., CONANCE, with the collaboration of the fuse manufacturers and users. ANCE is a National Organization for Standardization (ONN) registered by the DGN (Direccin General de Normas) in the electrical sector and household appliances which developes Mexican Standards (NMX) and
45、collaborates in the development of the Mexican Official Standards (NOM), voluntary and mandatory standards, respectively. The conformity assessment in accordance with ANCE Mexican Standards is responsibility of ANCE Certifi cation Products Division. The ANCE Certifi cation Products Division is accre
46、dited by the EMA (Entidad Mexicana de Acreditacin) in order to certifi cate a variety of products. The certifi cation is carry out following the corresponding procedures established and developed by the Technical Committee of Certifi cation in connection with the test reports performed in test labs
47、accredited by the EMA. The conformity assessment activities developed by ANCE cover quality systems, test lab and verifi cation products. AUGUST 1, 2000NMX-J-009/248/10-2000-ANCE CSA C22.2 NO. 248.10-00 UL 248-105 Foreword (CSA) The Canadian Standards Association, which operates under the name CSA I
48、nternational (CSA), provides certifi cation services for manufacturers who, under license from CSA, wish to use the appropriate registered CSA Marks on certain products of their manufacture to indicate conformity with CSA Standards. CSA Certifi cation for a number of products is provided in the inte
49、rest of maintaining agreed-upon standards of quality, performance, interchangeability and/or safety, as appropriate. Where applicable, certifi cation may form the basis for acceptance by inspection authorities responsible for enforcement of regulations. Where feasible, programs will be developed for additional products for which certifi cation is desired by producers, consumers or other interests. In performing its functions in accordance with its objectives, CSA does not assume or undertake to discharge any responsibility of the manufacturer or an