MSHA - Code of Federal Regulations - 30 CFR 57.12013
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MSHA - Title 30 CFR
30 CFR § 57.12013
Splices and repairs of power cables.
Permanent splices and repairs made in power cables, including the ground conductor where provided, shall be
(a) Mechanically strong with electrical conductivity as near as possible to that of the original;
(b) Insulated to a degree at least equal to that of the original, and sealed to exclude moisture; and,
(c) Provided with damage protection as near as possible to that of the original, including good bonding to the outer jacket.