Electrical monitoring systems

Details Electrical monitoring systems Electrical monitoring systems

H - Electricity

05

B

348/14, 342/47,

H05B 1/02 (2006.01) G01R 19/165 (2006.01) H02H 3/00 (2006.01) H02H 7/22 (2006.01)

Patent

CA 1225700

MP0806 SPECIFICATION FOR PATENT APPLICATION Title "Electrical Monitoring Systems" ABSTRACT Electrical systems, especially elongate heating systems, include means for monitoring circuit continuity. The systems comprise a switching device, e.g. a thermo- stat, as well as a circuit breaker. When the switching device is on, a relatively high current passes through the circuit and when it is off, a small controlled residual current flows in the circuit, and a current- detecting device signals when a discontinuity causes the current to drop below the expected value for the residual current. Preferably the switching device is placed so that the heater is at a positive potential even when the switching device is off, and a ground fault indicator is used to compare the currents in the two legs of the circuit and to signal when a ground fault causes the currents to differ.

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