MSHA - Code of Federal Regulations - 30 CFR 77.502
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MSHA - Title 30 CFR
30 CFR § 77.502
Electric equipment; examination, testing, and maintenance.

Electric equipment shall be frequently examined, tested, and properly maintained by a qualified person to assure safe operating conditions. When a potentially dangerous condition is found on electric equipment, such equipment shall be removed from service until such condition is corrected. A record of such examinations shall be kept.