1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 198M Mine-Duty FusesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION
2、OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Mine-Duty Fuses, UL 198M Fourth Edition, Dated April 23, 2003 Summary of Topics This revision to ANSI/UL 198M is being issued to reect the reaffirmation of the ANSI approval. No changes in requirements are involved. Text that has
3、been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the change
4、d requirement becomes effective. The new/revised requirements are substantially in accordance with Proposal(s) on this subject dated September 7, 2012. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electroni
5、c, 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. In no event will UL be liab
6、le 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 advised of the possibility of
7、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 any loss, expense, liability,
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9、ures, 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that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS n
10、otice. FEBRUARY 1, 2013 UL 198M tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 1, 2013 UL 198M tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AP
11、RIL 23, 2003 (Title Page Reprinted: February 1, 2013) 1 UL 198M Standard for Mine-Duty Fuses First Edition May, 1982 Second Edition March, 1988 Third Edition March, 1995 Fourth Edition April 23, 2003 This ANSI/UL Standard for Safety consists of the Fourth edition including revisions through February
12、 1, 2013. The most recent designation of ANSI/UL 198M as a Reaffirmed American National Standard (ANS) occurred on February 1, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any
13、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:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be alte
14、red 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 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 198M-2003 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIST
15、RIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 1, 2013 MINE-DUTY FUSES - UL 198M 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 5 3 Units of Measurement .5 4 Undated References
16、5 PERFORMANCE 5 General 5 MARKING 6 Details .8 OCTOBER 12, 2007 MINE-DUTY FUSES - UL 198M 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. OCTOBER 12, 2007 MINE-DUTY FUSES - UL 198M 4UL COPYRIGHTED MATERIA
17、L NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION 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
18、 requirements of the United States Department of Labor, Mine Safety and 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 fus
19、e shall comply with all of the requirements for the respective fuse Class 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 parenthes
20、es are explanatory or approximate information. 4 Undated References 4.1 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 b
21、e subjected to the D-C tests specied in Table 5.1. APRIL 23, 2003 MINE-DUTY FUSES - UL 198M 5UL 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 rate
22、d current 900 percent rated current 10 ka 20 ka 0 200 2T, 3H 2T, 3H 2T, 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 t
23、he four applicable tests specied in Table 5.1. If the internal features 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 e
24、ach set are to be temperature and humidity conditioned prior to testing. 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 a
25、ir oven at 90 3C (194 5.4F) for a minimum of 24 hours. b) Humidity Three 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
26、fuse is to have been temperature conditioned and two fuses are to have been 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 circ
27、uit is to consist of series connected inductors and resistors. An inductor 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
28、be used if agreeable to those concerned. 5.8 The test current is to be measured 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 oscillo
29、gram at a time, after the start of current, of not less than 4 times the 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 23, 2003 MINE-DUTY FUSES - UL 198M 6UL COPYRIGHT
30、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT 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 09 9 2 100 999 6 1000 9999 8 10,000 o
31、r greater 16 5.11 The time constant of the test circuit is the time when the 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 requ
32、ired value. Exception: Higher currents for the interrupting ability tests 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
33、 supercial damage. After the test, no fuse shall have: a) One or more openings 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 trol
34、ley-tap fuseholder, the fuseholder shall remain intact and shall readily accept 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-per
35、cent current, as appropriate, minus 0 plus 10 percent of rated current. The 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 circui
36、t using an ammeter, oscillographic records are to be used. 5.18 The recovery 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 oscillographi
37、c or other evidence such as excessive smoking, audible venting of gases, or 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, t
38、he results are unacceptable. Exception: Evidence of restrike is permitted within 30 milliseconds after initial current interruption. APRIL 23, 2003 MINE-DUTY FUSES - UL 198M 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.19 The peak arc-
39、voltage during the 10 kA and 20 kA tests shall not exceed 3000 V. MARKING 6 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 legible. 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 23, 2003 MINE-DUTY FUSES - UL 198M 8
