Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-07-15
1988-08-30
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
174152G, G08B 1700
Patent
active
047680245
ABSTRACT:
The apparatus for detection of fire in a building includes at least one duct for at least one cable, particularly an electrical cable, through a wall opening in one of the walls of the building. The duct having two sealing members sealing the wall opening on both sides of the wall against the cable and the wall of the cable-feed passage is a fire retardant seal, by which the line of the cable is sent between different fire zones separated by the wall from each other while preventing the spread of fire between the fire zones. At least one electrical temperature sensor is mounted inside of the duct and at least one electrical connecting conductor connecting the temperature sensor and a detection device for direct detection of a sensor signal from the temperature sensor is guided from the interior of the duct to the wall and is fire protected in the wall. The duct with the sensors and the connecting conductors are embedded in the wall of the building during its manufacture. Additional sensors including smoke or gas detectors and a plurality of variously positioned temperature sensors can also be provided.
REFERENCES:
patent: 3952809 (1976-04-01), Osborne
patent: 4319234 (1982-03-01), Rice
patent: 4520348 (1985-05-01), Swanson
patent: 4627647 (1986-12-01), Hauff
patent: 4646486 (1987-03-01), Hauff
patent: 4703136 (1987-10-01), Hauff
Dubno Herbert
Lianiides Ronald
Mullen Jr. Thomas J.
Swann III Glen R.
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