MSHA - Code of Federal Regulations - 30 CFR 77.602
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MSHA - Title 30 CFR
30 CFR § 77.602
Permanent splicing of trailing cables.

When permanent splices in trailing cables are made, they shall be:

(a) Mechanically strong with adequate electrical conductivity;

(b) Effectively insulated and sealed so as to exclude moisture; and,

(c) Vulcanized or otherwise made with suitable materials to provide good bonding to the outer jacket.