[Trolley wires.] All trolley wires shall be carried at least six inches outside of and parallel with the track rail on the side the trolley wire is located. When regular height is less than six feet six inches from top of rail, the lower side of trolley wire must not exceed six inches from the roof or cross-timber with hangers now in use, with hangers not to exceed twenty-five feet between centers, and the tension sufficient to keep all wires from sagging and to prevent trolley wheel from coming in contact with roof or cross-timbers. All new hangers hereafter installed shall not exceed five inches in depth from lower side of the trolley wire to the roof or cross-timbers.
[Wires crossing traveling ways.] All trolley and positive feed wires crossing places where persons or animals are required to travel, shall be safely guarded or protected from such persons or animals coming in contact therewith.
[Wires opposite rooms and refuge holes.] All trolley and positive feed wires shall be placed on opposite side of track from refuge holes or necks of rooms.
[Bare wires; when not to extend into working places.] No trolley wire shall be extended into or maintained in any room while being used as a working place; no trolley or feed wire shall be extended into any entry beyond the outside corner of the last breakthrough.
[Switches and circuit-breakers.] Switches or circuit-breakers shall be provided to control the current at the mine, and at all important points in the mine.
[Machine feed wires and insulators.] All machine feed wires shall be placed as near the rib and roof or cross-timbers as practicable; the positive wire to be carried not to exceed three inches from the rib and roof or cross-timbers, measured at the insulators, which shall be so placed as to keep the wire at least six inches outside of the track rail on the side the wire is located. Insulators shall be placed not exceeding fifty feet apart, and all wires shall be carried so that same will be not less than six inches outside of the track rail at any point on the side the wire is located. All positive wires shall be carried on glass or porcelain insulators, or insulators equally efficient. All negative wires shall be carried on suitable fixtures, and when carried in same entry as the positive wire, shall be carried on the same side of the entry as the positive wire, and as close to it as practicable. When machine or feed wires are carried in same entry as trolley wire, they shall be placed on the same side as the trolley wire, between trolley wire and rib. Nothing in the foregoing shall require negative wires being carried in same entry with positive wire.
[Wires in shafts or slopes.] When necessary to carry wires down shafts or slopes used as travelways, the wires must be thoroughly cased or protected, so that persons cannot be shocked therefrom.
[Wires; how placed in rooms.] Positive machine feed wires, when extended into rooms, shall be placed not nearer than four feet of the track, where the room is of sufficient width, and the same shall only be connected to the positive wire or wires on the entry while in actual use. The material used for making such connection shall be of sufficient length to reach across the entry, and when same is disconnected, it shall be kept with the machine operating at such point or working place. No electric wires shall be extended into any room unless a one hundred and fifty foot cable will not reach the face of the room, and then not beyond the outside corner of the last breakthrough.
[Protection of terminal ends.] All terminal ends of positive wires shall be guarded so as to prevent persons inadvertently coming in contact therewith.
[Connection of negative wires, pipe lines and track. Bonding of track.] The bonded track, the negative wires and metallic pipe lines, when coming near each other, may be connected together at intervals not exceeding five hundred feet, and any track used as the return or earth system shall be properly bonded. In no case shall a pipe line, or any part thereof, be used exclusively as the return, and when connected to the earth system, the negative wire or bonded track shall be of ample capacity, exclusive of the pipe line, to carry the current.