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Emergency lighting system with a DC sensing load relay
Emergency lighting system with a DC sensing load relay
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机译:带有直流感应负载继电器的应急照明系统
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摘要
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.
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