electrical wiring, connectors, taps, terminators and splices; electrical receptacle blocks; electrical switches; coaxial cable, connectors and outlets; switch and electrical outlet face plates; distribution interface unit which serves as an intermediate junction point for distribution of signals routed on coaxial cable; continuous power supply for low voltage products such as smoke alarms and security systems, enclosure and mounting hardware for hardware components of system controller electronics module, the central processing unit for the system; electrical circuit box load center; circuit breakers; surge suppressor; telephone gateway, a device for distribution of telephone and communications signals and which permits remote diagnostics of system; and coaxial head end, a device designed to amplify and combine coaxial cable signals from various video and audio inputs, including television, VCR, video camera and audio receiver, at system controller