MSHA - Code of Federal Regulations - 30 CFR 77.803-2
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MSHA - Title 30 CFR
30 CFR § 77.803-2
Ground check systems not employing pilot check wires; approval by the Secretary.

Ground check systems not employing pilot check wires shall be approved by the Secretary only if it is determined that the system includes a fail safe design which will cause the circuit interrupter to open when ground continuity is broken.