Section 195(8) in The Coal Mines Regulations, 2017
(8)Where more than one shot are to be fired at the same time,-(a)care shall be taken that all connections are properly made;(b)all shots, if fired belowground, shall be connected in series;(c)the circuit shall be tested, either for electrical resistance or for continuity, before connecting it to the firing apparatus, which shall be made with an apparatus specifically designed for the purpose and only after all persons in the vicinity have taken proper shelter as provided under regulation 196;(d)the cable to the shot-firing apparatus shall be connected last;(e)detonators of the same electrical resistance shall only be used.
