MSHA - Code of Federal Regulations - 30 CFR 77.504
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MSHA - Title 30 CFR
30 CFR § 77.504
Electrical connections or splices; suitability.

Electrical connections or splices in electric conductors shall be mechanically and electrically efficient, and suitable connectors shall be used. All electrical connections or splices in insulated wire shall be reinsulated at least to the same degree of protection as the remainder of the wire.