23.—(1) Except as may be provided in any scheme for the time being in force at the mine in pursuance of regulation forty-two, no person shall insert a detonator into a shot hole if that hole already contains a detonator.
(2) No shot firer shall fire a shot by means of a detonator and fuse other than safety fuse capped with a detonator at a workshop in accordance with regulation five.
(3) No shot firer shall use any detonator in firing a round of shots electrically in any mine unless it is a low tension detonator or a delay detonator.
(4) No shot firer shall use a delay detonator unless it is clearly marked with a number which indicates the period of delay.
(5) Where a delay detonator is to be used and the charge is to consist of more than one cartridge, the person charging the shot hole shall insert the primer cartridge first with the detonator at the back of the hole.