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single pole switch running 4 lights. It has an extra wire in the back hole of the switch - what is this for?
The normal wires are on the 3 screws - I'm changing to a timer switch. What is the extra wire into the back of the switch?
It is definitely a single pole switch and it is a brand new house. I will pigtail the 2 and see what happens. Thanks all.
The most likely answer is that the wire continues the circuit to some other location. Use a tester to determine if it is on the hot end of the switch. If so, attach a pigtail to the two wires using a wire nut and then use the pigtail for your hot leg for the timer.
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