(a) Section 317(e) of the Act (30 U.S.C. 877(e)) directs and authorizes the Secretary to propose and promulgate standards under which all working places in a mine shall be illuminated by permissible lighting while persons are working in such places Sec. Sec. 75.1719 through 75.1719-4 prescribe the requirements for illumination of working places in underground coal mines while persons are working in such places and while self-propelled mining equipment is operated in the working place.
(b) Mine operators shall comply with Sec. Sec. 75.1719 through 75.1719-4 not later than July 1, 1978. [41 FR 43534, Oct. 1, 1976, as amended at 43 FR 13564, Mar. 31, 1978]