Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1989-06-13
1990-12-18
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 46, 361 50, 340650, 324510, H02H 316
Patent
active
049790706
ABSTRACT:
When equipped with this improvement, a Gound Fault Circuit Interrupter will continue to monitor its protected circuits after tripping and automatically reset itself to restore power when no fault conditions are detected or when detected faults do not exceed a predetermined conduction level and are determined to be non-hazardous. The reset circuit shunts the tripped GFCI relay to pass a safely limited test current into the otherwise disconnected circuits of electrical utilization devices to determine the absence or the extent of fault conditions and is substantially fail-safe in regard to its own function. Four of the embodiments show the circuit as incorporated into the circuitry of an electrically resettable GFCI and a fifth as contained within an attachable enclosure.
REFERENCES:
patent: 4618907 (1986-10-01), Leopold
patent: 4649454 (1987-03-01), Winterton
patent: 4707759 (1987-11-01), Bodkin
patent: 4853821 (1989-08-01), Lewis
Deboer Todd E.
Yeager Arthur G.
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