30 C.F.R. § 77.803-2 Ground check systems not employing pilot check wires; approval by the Secretary.
Title 30 - Mineral Resources
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.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart I—Surface High-Voltage Distribution
§ 77.803-2 Ground check systems not employing pilot check wires; approval by the Secretary.
