1384

LAWS OF MARYLAND

Ch. 418

(3)  Trolley wires and trolley feeder wires shall
be aligned properly and installed at least 6 inches outside
the trackage line;

(4)  Cutout switches shall be provided at
intervals of not more than 2,000 feet and near the beginning
of each branch line;

(5)  Wires shall be kept taut and not permitted
to touch the roof, rib, or crossbars; particular care shall
be taken where the wire passes through a door opening to
preclude the possibility of bare wire coming in contact with
combustible material;

(5) Trolley wires and trolley feeder wires shall
be guarded adequately where necessary for employees to pass
or work under them regularly. The wires shall be guarded
adequately unless they are more than six and one-half feet
above the top of the rail. The wires also shall be guarded
adequately on both sides of every door;

(7)  The wires may not extend beyond the last
open crosscut and shall be kept at least 150 feet from
pillar workings;

(8)  Wires shall be anchored securely and
insulated properly at the ends; and

(9)  Wires shall not be installed in air known to
contain at least 1 percent methane, or in air returning from
pillar recovery work, or old workings where dangerous
amounts of methane may be liberated suddenly.]

[7-436.

Metal conduit, metallic covering, and cable armor shall
be grounded effectively. Each shall be electrically
continuous to afford a conductor path for the ground
circuit. Any metallic frame, casing, or other electric
equipment which can become "alive" through failure of
insulation or by contact with an energized part shall be
grounded effectively. Casings of transformers shall be
grounded effectively unless protected by insulation. Mining
equipment mounted on rubber tires or caterpillar treads,
receiving power through a trailing cable shall be grounded
effectively.]

[7-437.

(a) A fuse or any other equivalent protective device
of the correct type and capacity shall be installed on
electric equipment to protect against excessive overload.
Wire or other conducting material may not be used as a
substitute for a properly designed fuse. Every circuit
breaker shall be maintained in proper operating condition
and adjusted so equipment cannot be overloaded. Every