3 Way Switch Schematic

Wall switches used to control ceiling light fixtures or other fixtures come in three types. In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. Most common is the single pole switch the type used to control a light fixture from a single location the next most common is the three way switch which is commonly used to control a light fixture from two different locations.

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3 way switch schematic wiring diagram.

3 way switch schematic. Take a closer look at a 3 way switch wiring diagram. Unfortunately not all 3 way switches are wired the conventional way. This arrangement allows for lowering the lights in a 3 way circuit. The diagrams below show the conventional wiring for 3 way switches.

Interested in a 4 way switch wiring diagram. This is only a wiring schematic and not the actual wiring method used for 3 way switch installations. With these diagrams below it will take the guess work out of wiring. Below is a simple schematic diagram that can be applied to all three way electrical light switch connections.

A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. For example a long hallway or stairway might use a pair of three way. If you have any problems with these switches it may be best to call an electrician. The following 3 diagrams show the wiring for a specially made dimmer that can be used in these circuits in place of either of the the 3 way switches or both.

Most of the switch symbols can be changed in their appearance style and color to meet the requirements. Wiring a three way light switch. Typical 3 way switch wiring nm cable. Two very old three way switches.

Pick the diagram that is most like the scenario you are in and see if you can wire your switch. The switch symbols below include spst spdt dpst dpdt make contact break contact two way contact 2 position switch 3 position switch 4 position switch limit switch inertia switch mercury switch and also delay switch such as time delay switch time delay break flow actuate. Two very old three way switches are depicted in the photo above. This might seem intimidating but it does not have to be.

With a pair of 3 way switches either switch can make or break the connection that completes the circuit to the light. See alternate 3 way switch wiring configuration for another way 3 way switches may be wired. The black line wire connects to the common terminal of the first 3 way switch. 3 way dimmer switch wiring diagrams.

Wiring of 3 way light switches is certainly more complicated than that of the more common single pole switch but you can figure it out if you follow our 3 way switch wiring diagram.