![]() If you have any questions or comments, please leave them below. That’s it! Hopefully that clarified both the operation and installation of 3-way switches. What is a single pole double throw (spdt) switchDouble pole single throw switch wiring diagram Three quoraSingle pole double throw switch wiring diagram. Do not swap them on both switches or it will act the same way. Switch throw circuit pole double between light power single poles two switches wire way dpst electrical function spdt dpdt spst. Note: If you are like me, and want it to have the switches both in the down position to indicate that the lights are off, you may need to swap the hot and traveler line on ONE of the switches. This requires both special switches and special wiring. If the number of poles or throws are greater than 2, then the number is often directly used. By comparison, a 3-way switch uses two switches working together to control a load. If the lights don’t turn on and off by switching each switch individually, make sure you didn’t get your common connection confused with something else. Some standard numbers of poles and throws are Single (1 pole or 1 throw) and Double (2 poles or 2 switches). Once the wires are connected on both ends, you can turn on the power and test the switches. If there are not four connection points total (ground, common, and two outputs) then you probably don’t have the right type of switch. For clarity, check out the illustrations below. The other two wires can attach to either of the paired terminals. ELEGRP 3 Way Toggle Light Switch, 15 Amp, 120 V, Toggle Framed AC Quiet Switch, in Wall On/Off Switch Replacement, Self-Grounding, Residential and Commercial Grade, UL Listed (10 Pack, Glossy White) 497. To do this, put a piece of tape on the wire that goes to the common (third) terminal screw. ![]() Do not mistake the ground connection as one of the connectors - it’s almost always indicated with a green screw. When replacing an existing three-way light switch, be sure to return the wires to the proper screw terminals. The two conductors, hot and the traveler wire, are connected to the remaining two connections. For the switch where power is going out to the load, the power out to the load is connected to common. For the switch where power comes in, the power is connected to the common (usually indicated by having a different colored screw - if there isn’t a visual indicator, look at the accompanying paperwork). ![]() With the 3-way (SPDT) switches, there is a common connection and then two outgoing connections. In reality, it is just as straightforward. ![]()
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