Importance

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Abstract

An source and load isolating device that will permit a two-wire distribution system to transmit additional signals on the same two wires that were used to supply current to electrical loads. The system simultaneously permits the status of all electrical loads to be individually monitored. Source line isolators (SLI) are used to present a high impedance between the source and line, and line load isolators (LLI) are used to present a high impedance between the line and load thereby isolating both from the two wire distribution system. Isolation timing synchronizers (ITS) coordinate the timing period of the SLI and LLI high/low impedance devices and provide timing signals for the communication or monitoring equipment. During the time the lines are used for a second signal, the electrical load is completely isolated from all other electrical interferences and their status is easily measured. Thus, when the SLI and LLI present a low impedance between the source and line, the equipment that is using the isolation advantages of the invention will have terminated the second signal or load monitoring activities, and be waiting for the next cycle control signal from isolation timing synchronizers (ITS).

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First Claim