Common Wire 3 Way Switch. Switch off the circuit. The black line wire connects to the common terminal of the first 3 way switch.
The cable run linking the two switches is made with 3 wire cable. It s a foolproof way for a proper. Determine if the power goes to the light or the light switch.
The single dark colored screw is known as the common terminal.
How to determine the correct wires to attach to a 3 way switch when the wire and screw terminal color code is not certain. It s a foolproof way for a proper. When wiring a 3 way switch first screw the terminal screws of the new switch until they are difficult to turn. The ground screw is usually green.
