Whenever new fixtures, wires or systems are added or alterations or changes made to electrical fixtures, or new lines have been installed, the service shall be left off by the person doing the work, and no person, firm or corporation shall turn on the electricity or assist in turning on the same until a final certificate of the inspection has been issued by the electrical inspector. After the electrical inspector has made a finished inspection and placed his tag or label of approval on the fixtures of such job, and all certificates have been turned over to the electrical department by the owner, the service shall be established. (1991 Code § 5-24)