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CFR > Title 30 - Mineral Resources > CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR > SUBCHAPTER O—COAL MINE SAFETY AND HEALTH (parts 70 to 90) > PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES > SUBPART F—Electrical Equipment—General (§77.500 to §77.516) > 77.515—Bare signal or control wires; voltage.
77.515—Bare signal or control wires; voltage.
The voltage on bare signal or control wires accessible to personal contact shall not exceed 40 volts.