(a) When electrical equipment or fixed appliances are installed to serve a unit, an accessory building or structure, or building component, the installation shall be supplied by one of the following methods:

(b) When central air-conditioning equipment is proposed to be installed on a unit which was not originally designed for central air conditioning, an alteration permit shall be obtained from the department pursuant to the requirements of Title 25, California Code of Regulations, Chapter 3, section 4042. A permit to alter the unit is required, provided the unit bears or is required to bear the department's insignia of approval, or a HUD label of approval.

(c) If the park electrical system or the feeder supplying the lot electrical service equipment does not have the ampacity to supply the air-conditioning equipment in addition to its connected load, a permit to construct, as required in section 1018 of this chapter, shall be obtained for alteration of the required service supply and equipment.

(d) All electrical appliances and equipment not located within enclosed weatherproof structures must be approved for use in wet locations.