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Discussion Starter #1
I have a 4-way switch circuit with source power coming in to box1 and going out again.
With power disconnected from box 1, I still measure voltage between ground and red and also between ground and black on the wires between box 1 and 2. About 14 and 20 volts.
Where is this voltage coming from?
 

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You are using a digital meter and the voltages are phantom voltage induced by capacitive coupling.
 
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