3 Way & 4 Way Switch Wiring Diagram

4-Way Switch Wring Diagram. A 4-way switch is always placed in between two 3-way switches. Watch the 4-Way Switch video below and pay attention. If you understand how to wire a 3-way switch, you'll have no issues with a 4-way switch. You can have an indefinite number of 4-way switches in a circuit. They all must be between the two 3-way switches.

Here 3-wire cable runs between L1 and L2, 2-wire cable runs from the last light to SW1, and more 3-wire cable runs from SW1 to the 4 way switch and then to SW2. At the lights the hot source is spliced to the black wire running between lights, it does not connect to the lights.

4 Way Dimmer Switch Wiring Diagram. This is the wiring for a dimmer in a 4 way circuit. Three-wire cable runs between all the switches and 2-wire cable runs to the light. To make this circuit work, a 3 way dimmer can be used in place of one, or both of the standard 3 way switches.

3 Way Switch Wiring Diagram. Take a closer look at a 3 way switch wiring diagram. Pick the diagram that is most like the scenario you are in and see if you can wire your switch! This might seem intimidating, but it does not have to be. With these diagrams below it will take the guess work out of wiring.

4 Way Switch Wiring 4-Way Switches provide switching from three or more locations. If more than three switches are needed, simply place more 4-way switches between the three way switches. IMPORTANT: As you will see, most 4-way switch wiring is placed between the wiring of two 3-way switches, therefore a 4way switch is installed with two 3way ...

Momentary switches only stay active so long as they’re actuated. They don’t always have to be actuated by a pushdown. A 3-way switch is utilized on each individual end with one or more 4-way switches between both 3-way switches. If you know how to wire a 3-way switch, you will have no problems with a 4-way switch.

However, for efficiency and lower wire expense, you may want to replace one of the existing 3-way switches with the 4-way and add another j-box for the new location for the 3-way - attached via 14/3. In any case, as long as you realize that only the two "travelers" between 3-ways are switched by the 4-way, you should be able to figure out the rest.

Once your boxes are in place, you can start the process of installing and wiring the switches themselves. Refer to the above 3-way switch diagram. Step 3: Run New Cable (Romex) Between the 3- Way Switches. Regardless of what 3-way switch wiring diagram, you’re following, you’ll need to use a 3-wire cable to

Two cubic inches are required by the National Electrical Code for each #14 wire. See Tables 314.16(A) & (B). I have a diagram for this light switch wiring method on my 3-way switch page. I did not include grounding conductors on the 4-way switch wiring diagrams in order to keep them simple.

Add an electrical box for the second 3-way switch in the basement. Pro tip: It's likely you'll also need to replace the existing switch box with a larger one to accommodate the extra wires for the 3 way switch. Feed a length of 14-3 type NM cable (or 12-3, if you're connecting to 12-gauge wire) between the two boxes.