Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1989-11-14
1990-10-23
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
307118, 307326, 200 6105, H02H 316
Patent
active
049656937
ABSTRACT:
An improved electrical appliance with short-circuit hazard protection includes a plug unit adapted to be connected to a source of electricity and a feed cord extending from the plug unit to the electrical appliance for supplying electric current thereto. The feed cord has a connector terminal by which the feed cord is rotatably or detachably coupled to the appliance. The appliance incorporates a first hazard sensor which detects an electrical hazard or short-circuit condition caused by moisture, water, or the like conductive medium. The plug units includes an interrupting circuit which disconnects the feed cord from the source of electricity in response to the detection of the hazard condition. The connector terminal of the feed cord is provided also with a second hazard sensor which detects a like hazard condition caused around the connector terminal and actuates the common interrupting circuit to disconnect the feed cord from the source of electricity, whereby assuring protection against such electrical hazard even when the connector terminal alone is exposed to the hazard condition.
REFERENCES:
patent: 4270158 (1981-05-01), Gilardoni et al.
patent: 4687906 (1987-08-01), Fujishima et al.
patent: 4709293 (1987-11-01), Gershen et al.
Jennings Derek S.
Matsushita Electric & Works Ltd.
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