Abstract: A wiring system for modular structures, such as prefabricated panels, which utilizes two types of cord assemblies to distribute electrical energy throughout the structures. The first cord assembly is comprised of an electrical cable having a plurality of conductors which is terminated on both ends by male electrical connectors. The first cord assembly also has a tap in an intermediate position which includes two additional male electrical connectors of the same type. This cord assembly is used to connect two adjacent panels together electrically. To connect an additional panel to this junction, a second cord assembly having a female electrical connector on one end and a male electrical connector on the other end is used to connect the additional panel to the tap of the first cord assembly. Consequently, a plurality of panels can be connected together using only these two types of cord assemblies to provide for the distribution of electrical power throughout the panel system.