An information handling system, e.g., a mainframe computer, which includes as part thereof a housing having therein an electrical assembly including a circuitized substrate which in turn includes a plurality of contiguous open segments which define facing edge portions within an electrically conductive layer to isolate separate portions of the conductive layer such that the layer can be used for different functions, e.g., as both power and ground elements, within the system. At least one electrical component is positioned on and electrically coupled to the circuitized substrate of the system's electrical assembly.