3.—(1) Where in any part of a mine in which the use of lamps or lights, other than permitted lights, is unlawful electric power is used at or within one hundred and fifty feet of a working face, the manager shall make and secure the efficient carrying out of arrangements whereby determinations of the percentage of inflammable gas present in the general body of the air (in these regulations referred to as “the firedamp content”) are made in that part in accordance with the provisions of the four next following regulations.
(2) Where in any part of a mine of coal the use of lamps or lights, other than permitted lights, is unlawful and in any part of that mine which comprises a working face shots are fired in the ordinary course of working, the manager shall make and secure the efficient carrying out of arrangements whereby determinations of the firedamp content are made in accordance with the provisions of the four next following regulations in the part of the mine in which shots are so fired.
