three way switch with occupancy censor up and down stairs
Method 1. Connect the power to the occupancy sensor without going through either 3 way switch first. (Power should still be connected to the 3 way switches as before,adding pigtails and wire nuts as needed) Run another Cable from the occupancy sensor to the light (or to the other switch location where the light cable is in order to connect to the light). It is possible that the occupancy sensor needs to be in a different box or that another gang has to be added to the existing switch box to provide enough room for the sensor and added cable.
Method 1 continued. In the event more than one occpancy sensor is desired, the additional cable needs to go between the occupancy locations and be a 3 wire cable. This cable will carry raw power and neutral to the other occupancy electronics as well as the occupancy switched power to the light.
Method 2. Requires a special occupancy sensor where there is a separate pair of terminals, hot and neutral, for the occupancy electronics and a separate pair of terminals for the light being switched. Connect the incoming power to just the occpancy electronics terminals. (Power should still be connected to the 3 way switchs as before, adding pigtails and wire nuts as needed) Connect the two switching terminals one to each traveler of the 3 way setup. (The 3 way travelers should remain connected to the 3 way switches as before using wire nuts and pigtails as needed.) Also requires another gang in the first 3 way switch box.
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Last edited by AllanJ; 03-17-2011 at 08:47 AM.