Abstract: A driving device forming part of a controller is connected in a circuit and supplies power to a number of stations in the circuit. Each station has a microcomputer and at least one sensor capable of detecting a significant event of interest. Each microcomputer monitors its adjacent circuit, stores information derived from any sensor in its station and periodically informs the controller. The stations each have at least one circuit breaker controlled by its microcomputer for isolating that station from an adjacent station. The controller interrogates all the stations to identify any station at which an event has occurred and receives, stores, and analyzes data from the microcomputers and sends instructions thereto.