MSHA - Code of Federal Regulations - 30 CFR 75.902-2
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MSHA - Title 30 CFR
30 CFR § 75.902-2
Approved ground check systems not employing pilot check wires.

Ground check systems not employing pilot check wires will be approved only if it is determined that the system includes a fail safe design causing the circuit breaker to open when ground continuity is broken.