Any person, firm, or corporation who does not hold a master electrician license and rendering a service to the public to maintain, service, and/or repair any kind of electrically operated or controlled equipment, etc., must have at least 1 representative licensed as a maintenance electrician who is responsible to the Board for all employees under his supervision. Any person, firm, or corporation doing its own maintenance, service, and/or repairs, on its own premises, must have at least 1 representative so licensed who is responsible to the Board for all employees working under his or their supervision. Premises requiring a licensed representative unless they hold a master electrician license are: factories, industrial plants, department stores, theatres, public halls, office buildings, apartment houses, schools, arenas, and any other occupancy (other than private dwelling houses, doing their own maintenance service, and/or repairs) doing its own maintenance, service, and/or repairs. Each license so issued shall designate which kinds of apparatus or equipment the licensed representative is qualified to maintain, service and/or repair. City Code, 1976/83, art. 13, §78(d) Ord. 83-931