Electrical wiring system with overtemperature protection

Details Electrical wiring system with overtemperature protection Electrical wiring system with overtemperature protection

1995-06-13

1997-05-06

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361104, H02H 504

Patent

active

056277199

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), Neuhauser
patent: 3891894 (1975-06-01), Scarpino
patent: 4075675 (1978-02-01), Burkett et al.
patent: 4518445 (1985-05-01), Pedersen
patent: 4547658 (1985-10-01), Crowley

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