(a) Methane monitors shall be installed on continuous mining
machines, longwall mining systems, and on loading and haulage equipment used
in or beyond the last open crosscut.
(b) The monitors shall--
(1) Give warning at 1.0 percent methane;
(2) Automatically deenergize electrical equipment, except
power to monitoring equipment determined by MSHA to be intrinsically safe
under 30 CFR part 18, and prevent starting such
equipment when methane levels reach 1.5 percent. Diesel equipment shall be
shut off or immediately removed from the affected area; and
(3) Automatically deenergize electrical equipment when
power to a sensor is interrupted. Diesel equipment shall not be operated if
the monitor is inoperative.
(c) Sensing units of monitors shall be positioned at a location which
provides for the most effective measurement of methane.