All electrical installations shall be made in a workmanlike manner and shall be so designed, constructed, installed, and maintained that the hazard will be reduced, as far as it is reasonably possible. Installations of new utilitization equipment and conductors, and extensions, repairs, and changes in existing installations shall be made only by or under the supervision or direction of qualified persons.
(Prior code § 17.16.240(W) (Ord. 503 § 15.5(w), 1961))