(a) Tunnels located below stockpiles, surge piles, and coal storage
silos shall be ventilated so as to maintain concentrations of methane below
1.0 volume per centum.
(b) In addition to the tests for methane required by
§77.201 such tests shall also be made before any
electric equipment is energized or repaired, unless equipped with a
continuous methane monitoring device installed and operated in accordance
with the provisions of §77.211-1. Electric equipment
shall not be energized, operated, or repaired until the air contains less
than 1.0 volume per centum of methane.