27-350. Lights; trolley wires
A. Stationary lights which are approved by the inspector shall be provided during working hours at all stations in shafts during the time such shafts are in actual use, and at all stations in levels where hoisting or hauling is conducted by means of machinery, and at night at all working places on the surface.
B. Electric trolley wires shall be at least seven feet above the floor.
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