30 C.F.R. § 75.902-2 Approved ground check systems not employing pilot check wires.
Title 30 - Mineral Resources
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.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart J—Underground Low- and Medium-Voltage Alternating Current Circuits
§ 75.902-2 Approved ground check systems not employing pilot check wires.
