30 C.F.R. § 77.902-1 Fail safe ground check circuits; maximum voltage.
Title 30 - Mineral Resources
The maximum voltage used for ground check circuits under §77.902 shall not exceed 40 volts.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart J—Low- and Medium-Voltage Alternating Current Circuits
§ 77.902-1 Fail safe ground check circuits; maximum voltage.
