UL 198M-2018 UL Standard for Safety Mine-Duty Fuses (Fifth Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 198M Mine-Duty Fuses STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F

2、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Mine-Duty Fuses, UL 198M Fifth Edition, Dated April 4, 2018 Summary of Topics This new edition of ANSI/UL 198M, Standard for Safety for Mine-Duty Fuses, is being issued to reaffirm approval as an American Natio

3、nal Standard. No changes in requirements are involved. The editorial reaffirmation updates are substantially in accordance with Proposal(s) on this subject dated February 16, 2018. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any

4、 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 implied, including but not limited to, the implied warranties of merchantability or tness for any purpose

5、. 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 use of or the inability to use this Standard, even if UL or an authorized UL representative has been a

6、dvised 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 versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against a

7、ny 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 the purchasers computer system. APRIL 4, 2018 UL 198M tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT

8、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 4, 2018 UL 198M tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 4, 2018 1 UL 198M Standard for Mine-Duty Fuses First Edition May, 1982 Second Edi

9、tion March, 1988 Third Edition March, 1995 Fourth Edition April, 2003 Fifth Edition April 4, 2018 This ANSI/UL Standard for Safety consists of the Fifth Edition. The most recent designation of ANSI/UL 198M as a Reaffirmed American National Standard (ANS) occurred on April 4, 2018. ANSI approval for

10、a standard does not include the Cover Page, Transmittal Pages and Title Page. 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 h

11、ttps:/. 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 remain the sole and exclusive property of UL. COPYRIGHT 2018 UNDER

12、WRITERS LABORATORIES INC. ANSI/UL 198M-2003 (R2018)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 4, 2018 MINE-DUTY FUSES - UL 198M 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION

13、WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 4 3 Units of Measurement .4 4 Undated References 4 PERFORMANCE 5 General 4 MARKING 6 Details .7 APRIL 4, 2018 MINE-DUTY FUSES - UL 198M 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI

14、SSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover Class K and Class R fuses having an additional D-C rating and that are intended for use in protecting trailing cables in D-C circuits in mines in accordance with the requirements of the United States Department of Labor, Mine Safety and

15、 Health Administration. 1.2 These fuses have a maximum current rating of 600 A, a voltage rating of 300 or 600 V dc, and an interrupting rating of 20,000 A dc. 2 General 2.1 In addition to the requirements in this standard, a fuse shall comply with all of the requirements for the respective fuse Cla

16、ss in: a) The Low-Voltage Fuses Part 9: Class K Fuses, UL 248-9; or b) The Low-Voltage Fuses Part 12: Class R Fuses, UL 248-12. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1

17、 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. PERFORMANCE 5 General 5.1 Samples of the fuses are to be subjected to the D-C tests specied in Table 5.1. APRIL 4, 2018 MINE-D

18、UTY FUSES - UL 198M 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 5.1 Tests and number of samples Fuse rating, A Test 200 percent rated current 300 percent rated current 900 percent rated current 10 ka 20 ka 0 200 2T, 3H 2T, 3H 2T,

19、3H 2T, 3H 201 and greater 2T, 3H 2T, 3H 2T, 3H 2T, 3H T Temperature Conditioning H Humidity Conditioning 5.2 Sets of fuses, 5 samples in each set, of the maximum rating of each case size are to be selected, one set for each of the four applicable tests specied in Table 5.1. If the internal features

20、change at some intermediate rating in a particular fuse case size, this fact is to be considered and additional test sets are to be selected so that each construction is subjected to the complete test program. 5.3 Samples from each set are to be temperature and humidity conditioned prior to testing.

21、 A test is to be performed within one hour after removal of the samples for the test from the conditioning environment. The conditioning is to be as follows: a) Temperature Two samples from each set are to be conditioned in an air oven at 90 3C (194 5.4F) for a minimum of 24 hours. b) Humidity Three

22、 samples from each set are to be conditioned at a relative humidity of 95 5 percent at 25 5C (77 9F) for a minimum of ve days. 5.4 At least three fuses from each set are to be tested in a fuseholder of the trolley-tap type. One fuse is to have been temperature conditioned and two fuses are to have b

23、een humidity conditioned. 5.5 A fuse not tested in a fuseholder of the trolley-tap type, is to be clamped in place or mounted, with or without clamps, in fuse clips spaced to t the fuse, and tested in open air. 5.6 The test circuit is to consist of series connected inductors and resistors. An induct

24、or is not to incorporate a ferromagnetic core. 5.7 The open circuit voltage for the test circuit is to be not less than 100 percent and not more than 110 percent of the rated voltage of the fuse. Exception: A higher voltage may be used if agreeable to those concerned. 5.8 The test current is to be m

25、easured at the terminals of the fuseholder with the terminals short-circuited by a bus bar or other connection of negligible impedance. 5.9 The test current is to be determined by measuring the maximum displacement on an oscillogram at a time, after the start of current, of not less than 4 times the

26、 circuit time constant. Any overshoot above the time-current curve (exponential curve) is not to be considered. An ammeter (and shunt) may be used for currents up to 1800 A. APRIL 4, 2018 MINE-DUTY FUSES - UL 198M 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHO

27、UT PERMISSION FROM UL 5.10 The time constant of the test circuit is to be as specied in Table 5.2. Table 5.2 Circuit time constants Minimum test current, A Minimumtime contant, milliseconds 099 2 100 999 6 1000 9999 8 10,000 or greater 16 5.11 The time constant of the test circuit is the time when t

28、he current is 63.2 percent of the required test current. 5.12 If the current has a ripple, measurements are to be made from the midpoint of the ripple. 5.13 The test current is to be within plus 10, minus 0 percent of the required value. Exception: Higher currents for the interrupting ability tests

29、may be used if agreeable to those concerned. 5.14 Following each interruption, the tendency to restrike is to be monitored as outlined in 5.18. Monitoring is to be by an oscillograph. 5.15 For all tests, a fuse shall show only supercial damage. After the test, no fuse shall have: a) One or more open

30、ings greater than 1/16 inch (1.6 mm), in any direction, in any metal part of the fuse. b) One or more openings greater than 1/8 inch (3.2 mm), in any direction, in any nonmetal part of the fuse. 5.16 Following a test in a trolley-tap fuseholder, the fuseholder shall remain intact and shall readily a

31、ccept and retain a replacement fuse. Separate trolley-tap fuseholders may be used for each test. 5.17 For the 200- and 300-percent tests, a fuse may be preheated on an A-C or D-C low-voltage circuit adjusted to 200- or 300-percent current, as appropriate, minus 0 plus 10 percent of rated current. Th

32、e switchover time to the rated D-C voltage circuit is to be approximately 1 second and is to be completed before the start-to-arc occurs. If it cannot be determine that start-to-arc has occurred on the rated voltage D-C circuit using an ammeter, oscillographic records are to be used. 5.18 The recove

33、ry voltage is to be applied continuously across the fuse for 30 seconds after the initial current interruption the point at which the current reaches zero value for the rst time during the test. There shall be no oscillographic or other evidence such as excessive smoking, audible venting of gases, o

34、r the like of a tendency to restrike. If evidence of a restrike is noted, the recovery voltage is to be applied continuously for an additional 30-second time interval. If there is further oscillographic evidence of restrike, the results are unacceptable. Exception: Evidence of restrike is permitted

35、within 30 milliseconds after initial current interruption. APRIL 4, 2018 MINE-DUTY FUSES - UL 198M 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.19 The peak arc-voltage during the 10 kA and 20 kA tests shall not exceed 3000 V. MARKING 6

36、 Details 6.1 The marking of a mine duty fuse shall include: a) The words Mine Duty; b) The voltage rating of 300 or 600 V dc; and c) The interrupting rating of 20,000 A dc. 6.2 The marking specied in 6.1 shall be grouped or otherwise identied to indicate the relationship. 6.3 All markings shall be l

37、egible. 6.4 The D-C voltage shall not exceed the A-C voltage rating. Exception: A 250 V ac fuse may be rated 300 V dc. APRIL 4, 2018 MINE-DUTY FUSES - UL 198M 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 4, 2018 MINE-DUTY FUSES - UL 198M 8 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL