053-4 Wyo. Code R. § 75.506
(a) Electric-driven mine equipment and accessories manufactured on or after March 30, 1973, will be permissible electric face equipment only (1) if they are fabricated, assembled, or built under an approval, or any extension thereof, issued by the Bureau of Mines or the Mine Safety and Health Administration in accordance with schedule 2G, or any subsequent Bureau of Mines schedule promulgated by the Secretary after March 30, 1970, which amends, modifies, or supersedes the permissibility requirements of schedule 2G, and (2) if they are maintained in a permissible condition.
(b) Except as provided in paragraph (c) of this S 75.506 electric-driven mine equipment and accessories manufactured prior to March 30, 1973, will be permissible electric face equipment (1) if they were fabricated, assembled, or built under an approval, or any extension thereof, issued by the Bureau of Mines in accordance with the schedules set forth below, and (2) if they are maintained in a permissible condition.
Bureau of Mines Schedule 2D, May 23, 1936;
Bureau of Mines Schedule 2E, February 15, 1945;
Bureau of Mines Schedule 2F, August 3, 1955; and
Bureau of Mines Schedule 2G, March 19, 1968.
Copies of these schedules are available at all Coal Mine Safety District and Subdistrict Offices of the Bureau of Mines.
(c) Electric driven mine equipment and accessories bearing the Bureau of Mines approval numbers listed in Appendix A to this subpart are permissible electric face equipment only if they are maintained in a permissible condition.
(d) Electric cap lamps, electric mine lamps other than standard cap lamps, flame safety lamps, portable methane detectors, telephones and signaling devices, single- and multiple-shot blasting units, lighting equipment for illuminating underground mines, and methane-monitoring systems will be permissible electric face equipment only (1) if they are approved under the appropriate Bureau of Mines schedule applicable to such equipment and (2) if they are in permissible condition. The Bureau of Mines schedules referred to, dates issued, and the appropriate parts of this chapter are:
Electric Cap Lamps, Bureau of Mines Schedule 6D, August 26, 1939 (part 19);
Electric Mine Lamps Other than Standard Cap Lamps, Bureau of Mines Schedule 10C, May 17, 1938 (part 20);
Flame Safety Lamps, Bureau of Mines Schedule 7C, August 30, 1935 (part 21);
Portable Methane Detectors, Bureau of Mines Schedule 8C, October 31, 1935 (part 22);
Telephone and Signaling Devices, Bureau of Mines Schedule 9B, October 25, 1938 (part 23);
Single Shot Blasting Units, Bureau of Mines Schedule 12D, November 27, 1945 (part 24);
Multiple Shot Blasting Units, Bureau of Mines Schedule 16E, May 19, 1960 (part 25);
Lighting Equipment for Illuminating Underground Workings, Bureau of Mines Schedule 29A, December 2, 1958 (part 26); and
Methane-Monitoring Systems, Bureau of Mines Schedule 32A, July 27, 1966 (part 27).
053-4 Wyo. Code R. § 75.506