rs 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 pa