75.1323—Blasting circuits.
(2)
Long enough to permit the round to be fired from a safe location that is around at least one corner from the blasting area.
(e)
Blasting cables shall be shunted until immediately before firing, except when testing for circuit continuity.
(h)
Uninsulated connections in each blasting circuit shall be kept out of water and shall not contact the coal, roof, ribs, or floor.
(i)
When 20 or fewer boreholes are fired in a round, the blasting circuit shall be wired in a single series.
(j)
Immediately prior to firing, all blasting circuits shall be tested for continuity and resistance using a blasting galvanometer or other instrument specifically designed for testing blasting circuits.