456. When explosives in bulk and in cartridge form are loaded pneumatically:(1) only semiconductor hoses manufactured for that purpose may be used;
(2) the loading equipment may not be grounded by connecting it to piping, a rail or other continuous conductors;
(3) the grounding shall be performed according to the manufacturer’s specifications;
(4) if electric primers are used:(a) no plastic or other non-conducting liner may be used in the hole;
(b) the loading equipment shall be grounded if the primer is placed in the drill hole before or during loading.