30 CFR § 75.523-1
Deenergization of self-propelled electric face equipment installation requirements.
(a) Except as provided in paragraphs (b) and (c) of this section, all
self-propelled electric face equipment which is used in the active workings
of each underground coal mine on and after March 1, 1973, shall, in
accordance with the schedule of time specified in paragraphs (a)(1) and (2)
of this section, be provided with a device that will quickly deenergize the
tramming motors of the equipment in the event of an emergency. The
requirements of this paragraph (a) shall be met as follows:
(1) On and after December 15, 1974, for self-propelled
cutting machines, shuttle cars, battery-powered machines, and roof drills and
bolters;
(2) On and after February 15, 1975, for all other types of
self-propelled electric face equipment.
(b) Self-propelled electric face equipment that is equipped with a
substantially constructed cab which meets the requirements of this part,
shall not be required to be provided with a device that will quickly
deenergize the tramming motors of the equipment in the event of an
emergency.
(c) An operator may apply to the Director of Technical Support, Mine
Safety and Health Administration, Department of Labor, 4015 Wilson Boulevard,
Arlington, Va. 22203 for approval of the installation of devices to be used
in lieu of devices that will quickly deenergize the tramming motors of
self-propelled electric face equipment in the event of an emergency. The
Director of Technical Support may approve such devices if he determines that
the performance thereof will be no less effective than the performance
requirements specified in §75.523-2.
[38 FR 3407, Feb. 6, 1973, as amended at 39 FR 27557, July 30, 1974; 43 FR
12320, Mar. 24, 1978; 47 FR 28096, June 29, 1982]