[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: 30CFR18.20]

[Page 94]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 18--ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES--Table of Contents
 
             Subpart B--Construction and Design Requirements
 
Sec. 18.20  Quality of material, workmanship, and design.


    (a) Electrically operated equipment intended for use in coal mines 
shall be rugged in construction and shall be designed to facilitate 
inspection and maintenance.
    (b) MSHA will test only electrical equipment that in the opinion of 
its qualified representatives is constructed of suitable materials, is 
of good quality workmanship, based on sound engineering principles, and 
is safe for its intended use. Since all possible designs, circuits, 
arrangements, or combinations of components and materials cannot be 
foreseen, MSHA reserves the right to modify design, construction, and 
test requirements to obtain the same degree of protection as provided by 
the tests described in Subpart C of this part.
    (c) Moving parts, such as rotating saws, gears, and chain drives, 
shall be guarded to prevent personal injury.
    (d) Flange joints and lead entrances shall be accessible for field 
inspection, where practicable.
    (e) An audible warning device shall be provided on each mobile 
machine that travels at a speed greater than 2.5 miles per hour.
    (f) Brakes shall be provided for each wheel-mounted machine, unless 
design of the driving mechanism will preclude accidental movement of the 
machine when parked.
    (g) A headlight and red light-reflecting material shall be provided 
on both front and rear of each mobile transportation unit that travels 
at a speed greater than 2.5 miles per hour. Red light-reflecting 
material should be provided on each end of other mobile machines.