C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER O—COAL MINE SAFETY AND HEALTH › PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES › Subpart J—Underground Low- and Medium-Voltage Alternating Current Circuits

30 C.F.R. § 75.902-2

Approved ground check systems not employing pilot check wires

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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.