Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1990-07-17
1992-10-27
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 50, 361 58, 307326, H02H 316
Patent
active
051595176
ABSTRACT:
A sensing conductor and a detection circuit cause a low resistance shorting of an appliance circuit in response to immersion in water or other electrically conductive liquid, and an interrupter device, preferably located in the plug of the cord set, reacts to overcurrent, by opening both sides of the line. The sensing conductor must be strategically placed, within the appliance housing, to pass in proximity to liquid access points and the current carrying parts of the appliance. The detection circuit may be within the appliance or in the plug, with the sensing conductor extended to the appliance as a third conductor in the line cord. When a small current passes between the sensing conductor and the ungrounded or grounded neutral sides of the line or earth ground, current is shunted through the detection circuit from the ungrounded to the grounded neutral conductor, and away from the appliance circuit. A fuse link is opened in one side of the line which, in turn, releases normally open contacts, in the other side of the line, which open and remain open, so that both sides are permanently interrupted.
REFERENCES:
patent: 4079440 (1978-03-01), Ohnuma et al.
patent: 4245270 (1981-01-01), Busby
patent: 4464582 (1984-08-01), Aragaki et al.
patent: 4589047 (1986-05-01), Gaus et al.
Deboer Todd E.
Innovative Designer Products, Inc.
Yeager Arthur G.
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