3.—(1) Subject to the provisions of paragraph (3) and articles 4 and 5 below, exemption is granted—
(a)from section 4(1)(a) of the Act to persons of the classes specified in Schedule 2; and
(b)from section 4(1)(c) of the Act to persons of the classes specified in Schedule 3.
(2) A person shall be treated as falling within any class specified in Schedule 2 or Schedule 3 notwithstanding that he generates electricity or, as the case may be, supplies electricity to premises in circumstances other than those specified in the description of that class if the generation or, as the case may be, the supply of electricity in those circumstances would, if taken on its own, be such that—
(a)that person would fall within another class in Schedule 2 or, as the case may be, Schedule 3; and
(b)the exemption granted to persons of that other class had not ceased to be in force.
(3) No person shall be regarded as falling within any of the classes specified in Schedule 2 for as long as he is the holder of a licence under section 6(1)(a) of the Act, or within any of the classes specified in Schedule 3 for as long as he is the holder of a licence under, as the case may be, section 6(1)(c) or (2) of the Act.