Emergency lighting system

Details Emergency lighting system Emergency lighting system

1980-03-27

1982-04-06

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

307 66, 315174, H02J 900

Patent

active

043238203

ABSTRACT:
There is disclosed an emergency lighting system which is capable of distinguishing between a loss of power due to the opening of a line switch, and a loss of power resulting from a line failure when the switch is closed. A secondary power source powers the light in the event of a line failure. Thus when the line switch is open, i.e., when emergency lighting is not necessary, the light is not powered by the secondary source.

REFERENCES:
patent: 3771012 (1973-11-01), Niederjohn
patent: 3801794 (1974-04-01), Mauch et al.
patent: 4056757 (1977-11-01), Mauch et al.

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