30 C.F.R. § 77.515 Bare signal or control wires; voltage.
Title 30 - Mineral Resources
The voltage on bare signal or control wires accessible to personal contact 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 F—Electrical Equipment—General
§ 77.515 Bare signal or control wires; voltage.
