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How do you find the hot wire on a light switch?

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2011-03-14 15:32:34

In a properly wired switch, you should find a bare ground wire

of copper. Using a DVM or voltmeter, measure the voltage between

the ground wire and both wires attached to the switch. One should

be hot or at 120 volts. The other wire will lead to the device the

switch turns on or off. If there is no ground wire, you can run a

temporary wire from a earth or pipe ground to get a


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