MARVIN MANDEL, Governor

2869

other obstruction. They shall be provided at switch
throws, except where more than [six] 6 feet of clearance
are maintained and at room switches. A shelter hole at
least [ten] 10 feet deep, [four] 4 feet wide, and [six] 6
feet high shall be provided at each landing of a slope
where men are passing and cars are handled.

7-422.

(a) A man trip shall be operated at a safe speed
consistent with the condition of the road and type of
equipment used. The speed may not exceed [six] 6 miles
per hour.

(i) If belts are used to transport workers, a
minimum clearance of 18 inches shall be maintained
between the belt and the roof or crossbars, projecting
equipment, cap pieces, overhead cables, wiring, and other
objects. However, where the height of the coal bed
permits, the clearance may not be less than 24 inches.
The belt speed may not exceed 250 feet per minute while
workers are loading, unloading, or being transported.
The space between any two workers riding on a belt line
shall not be less than [five] 5 feet. Loading and
unloading stations shall be illuminated properly.

7-425.

(c) Blower fans with tubing used in gassy mines
shall be surrounded with the following safeguards:

(1)   The fan shall be      powered with a permissible
driving unit and installed   on the intake air side of the
entrance of the place to be   ventilated not less than 16
feet from the nearest rib;

(2)    The volume of air in which the fan is placed
shall be at least [two] 2 and one—half times the
manufacturer's maximum rated capacity of the fan;

(3)    The fan and tubing shall be maintained   in good
condition. The discharge end of the tubing shall   be kept
within 35 feet of the face, and not more than 300   feet of
the tubing shall be extended from the fan;

(4)   A certified official or other competent person
designated by the mine foreman shall examine for methane
in places ventilated by means of a blower fan before the
fan is started at the beginning of the shift and after
the interruption of fan operation for five minutes or
more during the shift;

(5)    Accumulations of methane may not be moved by a
blower fan and tubing; only line brattice shall be used