A commercial coach must be provided with feeder assembly equipment, installed by the manufacturer according to National Electrical Code and the provisions of this chapter. The assembly must be either:

(1) One overhead assembly containing the required number of insulated color-coded feeder conductors, one of which must be a grounding conductor; or

(2) One under-vehicle assembly consisting of conduit running from the commercial coach branch circuit panelboard to the underside of the commercial coach. Conduit must be sized in accordance with the National Electrical Code; or

(3) Other installations approved by the department.