(a) This Part, other than Regulations 222 and 223, apply to all places of work in which blasting is done.
(b) Regulations 222 and 223 apply in relation to blasting in any place of work for the purpose of cleaning of castings.
(2) In this Part, "cleaning of castings" means cleaning which is an incidental or supplemental process in connection with the making of metal castings, the freeing of the castings from adherent sand or other substances and includes the removal of cores and the general smoothing of the castings where such freeing is done, but does not include the freeing of castings from scale formed during annealing or heat treatment.