30 CFR § 75.805
Couplers.
[STATUTORY PROVISIONS]
Couplers that are used with medium-voltage or high-voltage power circuits
shall be of the three-phase type with a full metallic shell, except that the
Secretary may permit, under such guidelines as he may prescribe, no less
effective couplers constructed of materials other than metal. Couplers shall
be adequate for the voltage and current expected. All exposed metal on the
metallic couplers shall be grounded to the ground conductor in the cable. The
coupler shall be constructed so that the ground check continuity conductor
shall be broken first and the ground conductors shall be broken last when the
coupler is being uncoupled.
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