MSHA - Code of Federal Regulations - 30 CFR 77.902-2
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MSHA - Title 30 CFR
30 CFR § 77.902-2
Approved ground check systems not employing pilot check wires.
Ground check systems not employing pilot check wires shall be approved by the Secretary only after it has been determined that the system includes a fail safe design causing the circuit breaker to open when ground continuity is broken.