(a) Methane monitors shall be installed on continuous mining machines
and longwall mining systems.
(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;
(3) Automatically deenergize the equipment when power to a sensor is
(c) Sensing units of monitors shall be positioned at a location which
provides for the most effective measurement of methane.