When notified by the owner or contractor that the wiring or electric equipment is ready for his inspection, it shall be the duty of the Electrical Inspector or his deputy, to inspect the same and determine whether such wiring and equipment conforms to the regulations prescribed therefor. If he shall approve the same, he shall issue a written certificate thereof to the owner of such building, and if he does not approve the same, it shall be his duty to so notify the owner or contractor and state what is necessary to be done before he will approve the wiring and equipment.
('70 Code, § 8-6)