A three-way light switch allows the light to be controlled from two locations. How does this work?
Electrical – How does a three-way light switch work
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Sure. The three way just allows two switches to turn a light on and off. The motion sensor limits the controlled light, if it is set to go on, only when it senses motion.
Effectively, the three way switches prime the light to go on and the motion triggers it. The switches determine if there is power to the light socket. The motion detector (which controls power after the switches) then either turns the light on or off based on motion.
The problem is that it will be difficult to determine when the light is primed to go on. Regular switches (single pole, one way) are on when up and off when down. However, for three ways, up on a given switch an be on or off depending on the orientation of the other switch.
How do you know if the motion sensor controlled device is ready to go? If you can see both three way switches at the same time, a practical way to do this is to set up the switches so that they are on when both are up or down and off when they are not in the same position.
UPDATE: If you can't see both switches at the same time, you cannot know the motion controlled device is ready (ON) unless you set up some sort of pilot light. There are three way switches that are illuminated when off, such as this one.
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Real simple. 2 of the fluorescent lights are on the 3-way switches.
Separate from that, 2 of the fluorescent lights are on the 2-way switch.
The reason is to give a "low-high" setting.
The wire going from the 3-way switch to the 2-way switch is always-hot supply power. The other 3-way switch is the "remote".
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Best Answer
There might be some confusion because the type of switch you need (single-pole, double-throw) is usually called a three-way switch in the US, and a two-way switch in the UK. So for two switches to control the same lights, you need two SPDT switches, and you can find the wiring diagram on Wikipedia.