MSHA - Code of Federal Regulations - 30 CFR 18.92
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MSHA - Title 30 CFR
30 CFR § 18.92
Quality of material and design.

(a) Electrically operated machinery approved under the provisions of this Subpart E shall be rugged in construction and shall be designed to facilitate maintenance and inspection.

(b) MSHA shall conduct field investigations and, where necessary, field test electric machinery only where such machinery is found to be constructed of suitable materials and safe for its intended use.