Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1993-08-17
1995-06-13
Deboer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 50, 361104, 361103, 324541, 324539, 340651, 340652, H02H 504
Patent
active
054248957
ABSTRACT:
A household electrical service (10) is protected against overheating by running a sensor line or wire (36 or 38), coextensively together with hot, neutral and ground lines or wires (12, 13, 14 or 31, 32, 33), from a power company hookup (50) to a main breaker switch (18), and from respective branch circuit breakers (19) throughout the branch circuits (21, 22). The sensor line or wire (36 or 38) may be a length of heat fusible or otherwise temperature variant material which has a load end connected to ground and a source end connected to a control circuit (51) which trips the breaker (18 or 19) when an overtemperature condition melts the wire. Protection is extended through to individual devices (43) by continuing the sensor wire through the device cord (42). For this purpose, a plug ground prong (46) and receptacle ground prong connection (45) provide isolated ground and sensor wire connections. In a modified installation, fiber optic paths (38') are used in place of conductive wires and LED circuits replace load end ground connection.
REFERENCES:
patent: 3676739 (1972-07-01), Neuhouser
patent: 3891894 (1975-06-01), Scarpino
patent: 4075675 (1978-02-01), Burkett et al.
Beusse James H.
DeBoer Todd
Franz Warren L.
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