30 C.F.R. § 57.22309 Methane monitors (V-A mines).
Title 30 - Mineral Resources
(a) Methane monitors shall be installed on continuous mining machines 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 of such equipment when methane levels reach 1.5 percent; and (3) Automatically deenergize the equipment when power to a sensor is interrupted. (c) Sensing units of monitors shall be positioned at a location which provides for the most effective measurement of methane.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines
Equipment
§ 57.22309 Methane monitors (V-A mines).
