WM. PRESTON LANE, JR. ? GOVERNOR. 1075

149. Blasting cables. Blasting cables shall be:

1. Well insulated and as long as may be necessary to
permit the shot firer to get in a safe place around a corner.

2. Short-circuited at the battery end until ready to
attach to the blasting unit.

3. Staggered as to length or kept well separated when
attached to the detonator leg wires.

4. Kept clear of power wires and all other possible
sources of active or stray currents.

Power wires in face regions shall be deenergized during
charging and blasting operations.

149 A. Misfires, (a) Where misfires occur with electric
detonators, a waiting period of at least 5 minutes shall
elapse before anyone returns to the shot. After such
failure, the blasting cable shall be disconnected from the
source of power and the battery end short-circuited before
electric connections are examined.

(b) Explosives shall be removed by firing a separate
charge at least two feet away from, and parallel to, the
misfired charge or by washing the stemming and the
charge from the borehole with water, or by inserting and
firing a new primer after the stemming has been washed
out.

(c) A very careful search of the working place, and,
if necessary, of the coal after it reaches the tipple shall
be made after blasting a misfired hole, to recover any
undetonated explosive. The handling of a misfired shot
shall be under the direct supervision of the mine foreman
or a competent person designated by him.

149B. Cardox. (a) The provisions governing the
handling, storage, and transportation of explosives shall
apply to the heater elements of Cardox blasting devices
prior to their installation in the shells.

(b) Charged Cardox shells shall be transported under-
ground in insulated cars or in insulated boxes placed in
ordinary mine cars and shall be stored on wooden racks,
built for that purpose, in a crosscut or an idle room neck,
at least 10 feet from power lines and haulage tracks.
Where Cardox is used for blasting, the following shall
apply:

1. Cardox shells need not be tamped or stemmed.