(a) each drill hole is inspected and cleaned before any explosive is placed in the hole,

(b) a drill hole is of sufficient size to admit the free insertion of the explosive to be used to the bottom of the hole,

(c) only tamping rods of wood or other non-metallic, non-sparking material are used in loading explosives in drill holes,

(d) a cartridge used in loading a drill hole remains in its original wrapping, and

(e) while explosives are being loaded into a drill hole, every person not required for the blasting operation is barred from the vicinity.

(a) only a semi-conductive hose manufactured for such purpose is used,

(b) the pneumatic loading equipment is capable of providing protection against the hazards of static electricity, and

(c) if an electrical blasting cap is used, no plastic or non-conducting liners are used and the cap is not placed in the hole until the pneumatic loading of the hole has been completed, except where a procedure for doing otherwise has been prepared and adopted by the employer.