[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: 30CFR18.46]

[Page 103]
 
                       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. 18.46  Headlights.

    (a) Headlights shall be constructed as explosion-proof enclosures.
    (b) Headlights shall be mounted to provide illumination where it 
will be most effective. They shall be protected from damage by guarding 
or location.
    (c) Lenses for headlights shall be glass or other suitable material 
with physical characteristics equivalent to \1/2\-inch thick tempered 
glass, such as ``Pyrex.'' Lenses shall meet the requirements of the 
tests prescribed in Sec. 18.66.
    (d) Lenses permanently fixed in a ring with lead, epoxy, or 
equivalent will be acceptable provided only lens assemblies meeting the 
original manufacturer's specifications are used as replacements.
    (e) If a single lead gasket is used, the contact surface of the 
opposite side of the lens shall be plane within a maximum deviation of 
0.002 inch.