MSHA - Code of Federal Regulations - 30 CFR 77.601
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MSHA - Title 30 CFR
30 CFR § 77.601
Trailing cables or portable cables; temporary splices.


Temporary splices in trailing cables or portable cables shall be made in a workmanlike manner and shall be mechanically strong and well insulated. Trailing cables or portable cables with exposed wires or splices that heat or spark under load shall not be used.