ANSI UL 4248-8-2018 UL Standard for Safety Fuseholders C Part 8 Class J (Second Edition).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 4248-8 Fuseholders Part 8: Class J STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AU

2、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fuseholders Part 8: Class J, UL 4248-8 Second Edition, Dated April 30, 2018 Summary of Topics The Second Edition of the Standard for Safety for Fuseholders Part 8: Class J, UL 4248-8, has been iss

3、ued to reect the latest ANSI approval date, and to incorporate the following proposals: Corrections to Tables found in Figures 7A, 7B and 7C and revision to Figure 7C. Correction to Table 8.4A. The revised requirements are substantially in accordance with Proposal(s) on this subject dated August 25,

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8、lectronic Standard on the purchasers computer system. APRIL 30, 2018 UL 4248-8 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 30, 2018 UL 4248-8 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO

9、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL Association of Standardization and Certication NMX-J-009/4248/8-ANCE Second Edition CSA Group CAN/CSAC22.2 No. 4248.8-18 Second Edition Underwriters Laboratories Inc. UL 4248-8 Second Edition Fuseholders Part 8: Class J April 30, 2018 ANSI/UL 4248-8-2018U

10、L 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 Canadian Standards Association (operating as “CSA Group”), and Underwr

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13、ved in favor of ANCE. ISBN 978-1-4883-1160-4 2018 Canadian Standards Association All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher. This Standard is subject to review within ve years from the date of publication, a

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16、ighted 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 remain the sole and exclusive property of UL. This ANSI/UL Standard for Safety consists of the Second Editio

17、n. The most recent designation of ANSI/UL 4248-8 as an American National Standard (ANSI) occurred on April 30, 2018. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface. Comments or proposals for revisions on any part of the St

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19、TED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PREFACE 4 1 General 6 1.1 Scope .6 4 Classication .6 5 Characteristics 6 5.1 Summary of characteristics 6 6 Marking 6 6.1 Marking of fuseholder .6 7 Construction 6 7.6 Contacts of a cartridge fus

20、eholder 6 8 Tests .10 8.1 General 10 8.4 Verication of temperature rise 10 APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PREFACE This is the harmonized ANCE, CSA Gr

21、oup, and UL standard for Fuseholders Part 8: Class J. It is the second edition of NMX-J-009/4248/8-ANCE, the second edition of CSA C22.2 No. 4248-8, and the second edition of UL 4248-8. This edition of NMX-J-009/4248/8-ANCE supersedes the previous edition published on February 28, 2007. This edition

22、 of CSA C22.2 No. 4248-8 supersedes the previous edition published on February 28, 2007. This edition of UL 4248-8 supersedes the previous edition published on February 28, 2007. This harmonized standard was prepared by the Association of Standardization and Certication, (ANCE), CSA Group and Underw

23、riters Laboratories Inc. (UL). The efforts and support of the Technical Harmonization Subcommittee, THSC 32B, Low Voltage Fuses on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged. This standard is considered suitable for use for co

24、nformity 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 Requirements for Electrical Safety, and h

25、as been formally approved by the CSA Technical Committee. This standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. This standard has been approved by the America

26、n National Standards Institute (ANSI) as an American National Standard. Application of Standard 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

27、 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 Group and UL. An identical standard is a standard that i

28、s 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 identical or equivalent

29、 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 to each of the s

30、tandards development organizations to more accurately reect the intent. APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL A UL effective date is one established by Unde

31、rwriters Laboratories Inc. and is not part of the ANSI approved standard. APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Fuseholders Part 8: Class J 1 General This P

32、art is intended to be read together with the Standard for Fuseholders Part 1: General Requirements, hereafter referred to as Part 1. The numbering of the Clauses in this Part correspond to like numbered Clauses in Part 1. The requirements of Part 1 apply unless modied by this Part. For Clauses not s

33、hown below, refer to the Standard for Fuseholders Part 1: General Requirements, NMX-J-009-4248-ANCE CSA C22.2 No. 4248.1 UL 4248-1. 1.1 Scope 1.1.2 These requirements cover fuseholders intended for use with Class J Fuses as described in NMX-J-009/248/8-2000-ANCE, CSA C22.2 No. 248.8, UL 248-8, Low-V

34、oltage Fuses Part 8: Class J Fuses. 4 Classication 4.1 Class J fuseholders have a short-circuit withstand rating of 200,000 A. Class J fuseholders are rated 600 V, and are divided into six body sizes corresponding to the Class J fuse body sizes. 5 Characteristics 5.1 Summary of characteristics 5.1.3

35、 Voltage and current rating 5.1.3.1 Class J fuseholders shall be rated 600 V. 5.1.3.2 Class J fuseholders shall be rated 30, 60, 100, 200, 400, or 600 A. 5.1.4 Withstand rating 5.1.4.1 Class J fuseholders shall have a short-circuit withstand rating of a 200,000 A. 6 Marking 6.1 Marking of fuseholder

36、 6.1.1.1 In addition to the requirements of Part 1: the fuseholder shall be marked Use Class J Fuses. 7 Construction 7.6 Contacts of a cartridge fuseholder 7.6.1 The dimensions of a Class J fuseholder shall be as specied in Figures 7.6A, 7.6B, or 7.6C, whichever is applicable. This is generated text

37、 for gtxt. APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 7.6A Class J 30 and 60 A fuseholder Class of fuse Potential rating of fuse, volts Current rating of

38、fuse, amperes Dimensions of a class J fuseholder Dimensions, mm (in) BCD G Distance a between contact clips Minimum width of contact clip Diameter of ferrule Distance between end stops Minimum Maximum J 600 30 31.75 12.7 20.62 57.94 60.32 (1.250) (0.5) (0.812) (2.281) (2.375) 60 28.58 15.88 26.97 61

39、.11 63.5 (1.125) (0.625) (1.062) (2.406) (2.5) a Tolerances for the B dimensions are: 60 amperes or less: plus 0.79 mm (0.032 in) and minus 1.57 mm (0.062 in); APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O

40、R DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 7.6B Class J 100, 200, 400, and 600 fuseholder Class of fuse Potential rating of fuse, volts Current rating of fuse, amperes Dimensions of a class J fuseholder not bolted in place Dimensions, mm (in) BCEG Distance a between contact clips Minimum width

41、 of contact clip Thickness of blade Minimum unobstructed clearance J 600 100 69.85 22.22 3.18 122 (2.750) (0.875) (0.125) (4.80) 200 79.38 31.75 4.75 150 (3.5) (1.250) (0.187) (5.90) 400 88.9 44.45 6.35 185 (3.5) (1.750) (0.250) (7.28) 600 98.43 50.8 9.52 207 (3.875) (2.0) (0.375) (8.15) a Tolerance

42、s for the B dimensions are: 100 and 200 amperes: plus 1.57 mm (0.062 in) and minus 0.76 mm (0.032 in); 400 and 600 amperes: plus 2.36 mm (0.093 in). APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT

43、ION WITHOUT PERMISSION FROM UL Figure 7.6C Class J 100, 200, 400, and 600 Fuseholder Fuse bolted in place Current rating of fuse, amperes Dimensions of a class J fuseholder fuses bolted in place Dimensions, mm (in) HI K Center-to-center of studs or clearance holes a Diameter of stud or bolt Diameter

44、 of clearance hole End of terminal to center of stud or clearance hole maximum 100 92.07 (3.625) 6.0 (0.250) 6.75 (0.281) 9.52 (0.375) 200 111.13 (4.375) 6.0 (0.250) 6.75 (0.281) 14.27 (0.562) 400 133.35 (5.250) 10.0 (0.375) 10.5 (0.406) 19.93 (0.785) 600 152.4 (6.0) 12.0 (0.5) 12.5 (0.531) 25.0 (0.

45、984) NOTE See Figure 7.6B for dimensions B, C, E and G. a Tolerance 1.57 mm (0.062 in) APRIL 30, 2018 NMX-J-009/4248/8-ANCE CAN/CSAC22.2 NO. 4248.8-18 UL 4248-8 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8 Tests 8.1 General 8.1.1 Types

46、 of tests 8.1.1.1.1 Each fuseholder shall be subjected to the tests as specied in Part 1. 8.4 Verication of temperature rise 8.4.3 Test method 8.4.3.1 With dummy fuses in place and carrying rated current continuously, the temperature on a material or component or electrical insulation shall not exce

47、ed the values in Table 8.4B. 8.4.3.2 Dummy fuses shall be unplated copper and shall conform to the dimensions in Table 8.4A. 8.4.3.3 The temperatures specied in Table 8.4A are based on an assumed ambient temperature of 25C (77F). A test may be conducted at an ambient temperature within the range of

48、20 40C (68 104F). 8.4.3.4 During a test conducted at an ambient temperature of 25C (77F), an observed temperature shall not exceed the required value specied in Table 8.4B. 8.4.3.5 If a test is conducted at an ambient temperature other than 25C (77F), an observed temperature shall be corrected as de

49、scribed in Clause 8.4.3.6. Neither a corrected temperature nor an observed temperature shall exceed the required value specied in Table 8.4B. 8.4.3.6 An observed temperature shall be corrected by addition if the ambient temperature is lower than 25C (77F) or subtraction (if the ambient temperature is higher than 25C) of the difference between 25C and the ambient temperature. 8.4.3.7 If a corre