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SSI Photocells: How Should Daylighting Control Sensors (Photocells) Be Placed So As Not To Interfere With Each Other?

Any light which a sensor can see which it is not controlling is interpreted by the sensor as sunlight.  As a result if a sensor can see the lights that another sensor is controlling it is possible that the two will start “fighting” and cause both of them to cycle on and off or dim up and down continuously.  It is recommended that wherever possible a single Dual Zone sensor should be used instead of two separate sensors.  If two sensors must be used then they should be at least 15 feet away from the lights that the other sensor is controlling.  The minimum required distance may change depending on the height of the ceiling, the flooring type, and other factors.

 

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