30 CFR § 57.22214 Changes in ventilation (I-A, II-A, III, and V-A mines).
(a) Changes in ventilation which affect the main air current or any
split thereof and which adversely affect the safety of persons in the mine
shall be made only when the mine is idle.
(b) Only persons engaged in making such ventilation changes shall be
permitted in the mine during changes.
(c) Power shall be deenergized in affected areas prior to making
ventilation changes, except power to monitoring equipment determined by MSHA
to be intrinsically safe under 30 CFR part 18. Power
shall not be restored until the results of the change have been determined
and a competent person has examined affected working places for methane.