Ground circuit monitor

Details Ground circuit monitor Ground circuit monitor

1975-05-21

1976-06-01

Caldwell, John W.

Communications: electrical

Systems

Call station

317 18A, 5 68, G08B 2100

Patent

active

039613194

ABSTRACT:
A monitoring circuit to detect an open circuit in the ground conductor of an electrical system. The circuit also senses a high inpedance and leakage current in the ground conductor. Additionally, the circuit protects against reversal of the high and neutral input supply conductors. The circuit includes a delayed latching circuit which prevents reconnection of a device to be protected.

REFERENCES:
patent: 2207202 (1940-07-01), La Deau
patent: 2806993 (1957-09-01), Matousek
patent: 3072827 (1963-01-01), Benish
patent: 3289194 (1966-11-01), King
patent: 3320480 (1967-05-01), Failor
patent: 3407336 (1968-10-01), Embree
patent: 3426342 (1969-02-01), De Langis
patent: 3728581 (1973-04-01), Adamo
patent: 3766434 (1973-10-01), Sherman
patent: 3766435 (1973-10-01), Childers

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