The Coal and Other Mines (Ventilation) (Variation) Regulations 1966
Regulation 5 of the Coal and Other Mines (Ventilation) Regulations 1956 prescribes places at which determinations of firedamp content are required to be made at longwall faces by virtue of the use of electric power at or within one hundred and fifty feet of that face, or by virtue of the firing of shots. Regulation 7 prescribes the intervals at which such determinations are to be made.