MSHA - Code of Federal Regulations - 30 CFR 18.91
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MSHA - Title 30 CFR
30 CFR § 18.91
Electric equipment for which field approvals will be issued.


(a) Individual field approvals will be issued by MSHA under the provisions of this Subpart E for electrically operated machines commercially built, or constructed, by the owner-coal mine operator of such machines including any associated electrical equipment, electrical components, and electrical accessories.

(b) Approvals will not be issued under the provisions of this Subpart E for electrically operated mining equipment manufactured or rebuilt primarily for sale or resale to any operator of a coal mine, or for small electrically operated equipment which consumes less than 2,250 watts of electricity, or for instruments and other small devices which employ electric power.