30 CFR Part 57Public Domain
§ 57.22309 — Methane monitors (V-A mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
(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.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.