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STEP 4
Identify The LINE And LOAD
1. Make sure that the light is off. Then, check the black common terminals
on both switches using a voltage tester. One of them should test positive
for voltage, and the other one should not.
Wire that has voltage = LINE
Wire that doesn’t have voltage = LOAD
2. The wire box that houses your line wire will be your line side box/switch
while the box that houses your load wire will be your load side box/switch.
3. If you are installing a 4-way/multi-way setup, the 4-way switch will have
2 black screws and 2 copper colored screws.
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