(A) Stop-work orders. Any order to discontinue work, or other stop-work order as provided in this code shall, when practicable, be delivered in person to the electrician on the premises or to the owner or his or her agent. All such orders shall also be posted in a conspicuous place on the subject premises. Such posting upon the subject premises shall constitute service of notice upon all interested parties.
(B) Other orders, denials, revocation notices, suspension notices and the like. Service of any other order, denial of permit, notice of revocation or suspension of registration or other written notice required under the provisions of this code shall be perfected by delivering said written notice, or a copy thereof, in person to the person or persons required to be notified. In cases where such personal service is either impracticable or impossible, the notice shall be sent by registered mail or certified mail to the most recent known address of the person or persons required to be notified. If such service by mail is unsuccessful or impossible, the notice shall be by publication on two separate days within seven consecutive days in the official newspaper of the city and return thereof made in conformity with the provisions of the state statutes governing service of citation by publication.
(`87 Code, § 30-33)