MSHA - Code of Federal Regulations - 30 CFR 77.516
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MSHA - Title 30 CFR
30 CFR § 77.516
Electric wiring and equipment; installation and maintenance.

In addition to the requirements of §§77.503 and 77.506, all wiring and electrical equipment installed after June 30, 1971, shall meet the requirements of the National Electric Code in effect at the time of installation.

Subpart G--Trailing Cables