The third wire is your travelers wire used in three way switch configurations. For one switch configurations (ironically called a two way switch) it is not used.
Your instructions should have included how to wire this for three way switch set ups. A common way to wire it is not to 'eliminate' the extra switch, but rather use the motion switch in the other location and not use the travelers wire.
No, using a three way switch in a two way switch configuration is not dangerous, you just don't use the travelers wire (red).
Serious, hasn't anyone done house wiring here?
Bueller? Bueller?
Last edited by Toymeister; 10-09-2021 at 07:23 PM.
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