[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR28.40]

[Page 151]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 28--FUSES FOR USE WITH DIRECT CURRENT IN PROVIDING SHORT-CIRCUIT PROTECTION FOR TRAILING CABLES IN COAL MINES--Table of Contents
 
     Subpart E--Construction, Performance, and Testing Requirements
 
Sec. 28.40  Construction and performance requirements; general.


    (a) MSHA shall issue approvals for fuses for use with direct current 
in providing short-circuit protection for trailing cables, when such 
fuses have met the minimum construction, performance, and testing 
requirements set forth in this subpart.
    (b) Fuses submitted to MSHA for approval will not be accepted unless 
they are designed on sound engineering and scientific principles, 
constructed of suitable materials, and evidence good workmanship.
    (c) Fuses may be single-element or dual-element in type, however, 
they shall be capable of interrupting any direct current within a range 
from the ampere rating of the fuse under consideration for approval up 
to 20,000 amperes.
    (d) MSHA shall accept the fuse size and ampere rating as specified 
in the Underwriters Laboratories, Inc., standard for alternating current 
fuses (UL-198), which is hereby incorporated by reference and made a 
part hereof. This document is available for examination at Approval and 
Certification Center, RR 1, Box 251, Industrial Park Road, Triadelphia, 
WV 26059, and copies of the document are available from Underwriters 
Laboratories, Inc., 161 Sixth Avenue, New York, NY 10013.
    (e) Fuses shall be capable of completely interrupting a current 
within 30 milliseconds after initial current interruption, and shall not 
show any evidence of restriking after 30 milliseconds.
    (f) The blown fuse shall show only superficial damage.

[37 FR 7562, Apr. 15, 1972, as amended at 43 FR 12316, Mar. 24, 1978; 60 
FR 35694, July 11, 1995]