Youll be using the top conductor to run your hot wires and your neutrals while the bottom conductor will be used for your traveler wires. Traveler wires are interchangeable.
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The black line wire connects to the common terminal of the first 3 way switch.
Traveler wire. The traveler terminals are interchangeable. Depending on the wiring in your home the bare ground wire is attached to the ground terminal on the metal frame of the switchs mounting ears. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together.
It is used between two three way switches to control a light from a third or more location. The traveler wires run between the two 3 way switches offering two potential pathways to complete the circuit and send power onward to the light fixture. Connect each of the other two wires to one of the light colored traveler terminals.
The wire colors are almost always red black and white. 14 gauge wire needs a 15 amp breaker while a 12 gauge wire requires a 20 amp breaker. This is a three conductor 14 gauge wire excluding the ground wire cable.
Here is a link to some 3 way switch wiring diagrams that should be very helpful. In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. It makes no difference which traveler wire goes to which traveler terminal on the switch.
In residential wiring the white wire is neutral on the 120 volt circuits. A three wire cable is typically installed between the two 3 way switch locations to provide the switching using the traveler set which is not part of a single pole switch. This is a switch that has four terminals on it excluding the ground wire.
On a 3way circuit the red is the traveler and the white is neutral. In building wiring multiway switching is the interconnection of two or more electrical switches to control an electrical load often but not always lighting from more than one location. The remaining two insulated wires are then attached to the remaining traveler terminals.
On a 240 volt 3 wire connection the white black are hot. The traveler wires dont need to be labeled because either traveler wire can connect to either traveler screw terminal on the switch. Typical 3 way switch wiring nm cable.
The taped white wire of cable c3 is the hot to the light lt2 where the red wire of cable c2 is used to splice the hot to the next light lt1. To wire the new switch connect the labeled common wire to the com terminal usually bronze or dark colored on the switch. See this guide for details on running wire through your wall.
The travelers of each switch are connect together using cable c4 taped white and red wires. 1 attach the common wire to the common terminal on the new switch. For example this allows lighting in a hallway stairwell or large room to be controlled from multiple locations.
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