No person shall be designated or serve as an emergency interim successor unless he or she may, under the Constitution and statutes of this state and the charter or ordinances of this city, hold the office of the person to whose powers and duties he or she is designated to succeed, but no provision of any ordinance prohibiting an officer or employee of this city from holding another office shall be applicable to an emergency interim successor.
(`78 Code, § 2.56.030.)