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To install a 3-way switch in a home electrical system, you need to first turn off the power to the circuit. Then, remove the existing switch and identify the common wire. Connect the common wire to the dark-colored screw on the new 3-way switch. Next, connect the other two wires to the remaining screws on the switch. Finally, secure the switch in the electrical box, turn the power back on, and test the switch to ensure it is working correctly.

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4mo ago

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