[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR77]

[Page 626]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 77_MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK 
AREAS OF UNDERGROUND COAL MINES--Table of Contents
 
                     Subpart C_Surface Installations
 
Sec.  77.211-1  Continuous methane monitoring device; installation and 
operation; automatic deenergization of electric equipment.

    Continuous methane monitoring devices shall be set to deenergize 
automatically electric equipment when such monitor is not operating 
properly and to give a warning automatically when the concentration of 
methane reaches a maximum percentage determined by an authorized 
representative of the Secretary which shall not be more than 1.0 volume 
per centum of methane. An authorized representative of the Secretary 
shall require such monitor to deenergize automatically electric 
equipment when the concentration of methane reaches a maximum percentage 
determined by such representative which shall not be more than 2.0 
volume per centum of methane.