7.—(1) Any person authorised by a public electricity supplier, after 5 working days' notice to the occupier of any premises, or to the owner of any premises which are unoccupied, may at all reasonable times, on production of some duly authenticated document showing his authority, enter the premises for the purpose of—
(a)placing a new electric line or new electrical plant in the place of or in addition to any existing line or plant which has already been lawfully placed; or
(b)repairing or altering any such existing line or plant.
(2) In the case of emergency arising from faults in any electric line or electrical plant entry may be made under sub-paragraph (1) without the notice required to be given by that sub-paragraph, but the notice shall then be given as soon as possible after the occurrence of the emergency.