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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 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES > SUBPART I—Underground High-Voltage Distribution (§75.800 to §75.834) > 75.806—Connection of single-phase loads.
75.806—Connection of single-phase loads.
Single-phase loads, such as transformer primaries, shall be connected phase-to-phase.