Because the electrical code as of the 2011 nec update requires a neutral wire in most new switch boxes a 3 wire cable runs between the light and switch. Remember the black wire that you wrapped around the traveler wires is the common.
How To Wire A 3 Way Switch With 2 Lights Quora
Wiring a three wire switch. The 2 wire cable feed from the power source enters the bottom of the switch box and the hot black wire connects to the common or shunt terminal on the 3 way switch. Connect the wire marked common to the black or dark colored screw. A box with three switches is crowded enough without adding extra wire connectors and pigtails. Take your three way switch. Components of 3 way switch wiring. This might seem intimidating but it does not have to be.
Take a closer look at a 3 way switch wiring diagram. There is only one such terminal on a 3 way switch and it is usually identified as the one having a different color terminal screw often significantly darker from the other two. If you are trying to troubleshoot a 3 way switch operation you will need to identify the function of each wire. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. With these diagrams below it will take the guess work out of wiring. Connect the ground wire to the green screw.
Two black and one red. In this diagram the incoming hot wire attaches to the first switchs common dark colored terminal. This is an updated version of the first arrangement. Strip all three wires with wire strippers. Instead of running a separate pigtail from the hot wire to each switch just leave the hot wire extra long. You should have three remaining wires in each box.
The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch. This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch. Heres a wiring method that eliminates extra connections and creates a neater installation. The red and black are used for hot and the white neutral wire at the switch box allows for powering a timer remote control or other programmable switch. All three way switch and 2 way switch wiring diagrams have the same basic components. When wiring a 3 way switch first screw the terminal screws of the new switch until they are difficult to turn.
Connect the two remaining traveler wires to the two brass or light colored screws. Wires consisting of a line a load a neutral a pair of travelers and two 3 way switches. You will see a black screw and two gold screws on the switch.
Gallery of Wiring A Three Wire Switch
