Pennsylvania Statutes Title 52 P.S. Mines and Mining § 70-1116. Storage battery equipment

(a) All storage battery equipment and charging stations shall be designated, operated and ventilated so that gas from the batteries will be safely diluted. Storage battery charging stations shall be on a separate split of air.

(b) The presence of flammable materials or smoking is not permitted in any storage battery room or charging station. Signs to this effect shall be posted in all battery rooms or charging stations.

(c) Storage battery operated equipment may be used in face areas of gassy mines when all electrical parts are enclosed in explosion proof casings and the batteries are adequately ventilated.