Emergency lighting system with a DC sensing load relay

Details Emergency lighting system with a DC sensing load relay Emergency lighting system with a DC sensing load relay

1997-01-15

1999-01-12

Pascal, Robert

Electric lamp and discharge devices: systems

Automatic substitution of the power supply

307 66, 307128, H02J 906, H01H 4732

Patent

active

058594990

ABSTRACT:
An emergency lighting system has emergency light units operable by DC power and connected to a source of AC and DC power by the same conduit system. Power to the conduit system may be switched from AC to DC in the event of a power failure and a load relay module in the conduit system adjacent the light units senses the change to DC current and switches from an Ac load output to a DC load output to supply DC power to the emergency light units. The system will generally include both exit signs operable by both AC and DC power and emergency light units operable only by DC power.

REFERENCES:
patent: 2777074 (1957-01-01), Stockwell
patent: 4349863 (1982-09-01), Petersen
patent: 5631504 (1997-05-01), Adahan
Crippen, "Selecting and Applying Emergency Lighting Systems," Electrical Construction and Maintenance, pp. 58-64, Aug. 1977.

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