(1) Without prejudice to the generality of the requirements of Chapter 1 of Part 6 an employer shall ensure that no person under the age of 18 years of age is employed, except for the purposes of training or instruction -
(a) in any blasting operation,
(b) to assist in any blasting operation,
(c) in any blasting chamber, or
(d) in cleaning, maintaining or repair of any blasting apparatus, blasting enclosure or ventilating plant connected with the enclosure.
(2) An employer shall ensure that no person under the age of 18 years of age works within six metres of a blasting enclosure when blasting is being carried out by means of compressed air or steam unless -
(a) the enclosure is in a room, and
(b) the person is not exposed to any dust coming from that enclosure.