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Old 08-03-2015, 02:36 PM   #502
Sr. Mints
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Electrical wiring Q:

The lights (normal, regular $0.89 lightbulb type fixture) in my hallway are currently controlled by two on/off switches: one switch is located right in next to the entry door, and one is further in the house, in the hallway. It is my understanding this is a three-way switch setup, and I read that three-way switches are used in pairs.

But I want to install a motion sensor switch on just one of those existing switch locations. If I use a motion sensor that specifically specifies it is a three-way switch, can I leave the other one as-is? Will the motion sensor still work regardless if the hallway switch is flicked up or down?

Or would it be ideal to just unhook the hallway switch all together and only put a single-pole motion sensor switch next to my door?

Or is there an option C here that I am not considering?

I went to Home Depot to seek an answer, but the guy didn’t really know, and certainly didn’t inspire me with confidence.
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