Before reading this page, you may want to visit 3-way switches and 4-way switches.
If in doubt, hire it out.
Motion Detectors and Occupancy Sensors.
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Wiring a 4 Way Switch.
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Think of your staircase or hallway.
Each 3-way switch in these examples are controlling the power source to the same load.
This might seem intimidating, but it does not have to be.
It then splits to a light fixture and another 3 way.
With conventional wiring, line voltage enters the first 3- way switch box 3- Way Switch Wiring Diagram, Conduit.