There are many ways that a three way switch can be wired but usually power or the light fixture connect to the load side of the switch and traveler wires run between traveler screws on both switches. A three way light switch is different than a traditional single pole light switch as it contains an extra screw to connect an extra wire.
How To Wire A Light Switch Smartthings
3 way switch only works when one switch is on. The spdt toggle switch can be considered as a two way light switch as it has three terminals and works very similar to the two way light switch. The following image shows a typical spdt toggle switch with its terminals. When both switches are aligned so that they both send power through the same leg the light goes on. Just move in and ive got a 3 way switch in the kitchen. Switch b only works when the light was first turned on by switch a. This is known as the common screw and its usually black instead of brass or silver.
The common terminal is the bridge between the power supply and the load typically a light fixture. Make sure only one switch has the hot going to the common. Scott first gives an explanation of the three way switch two switches that control one light fixture. I have two additional questions but if ive already take. I think you have the hot line going to one of the switch legs on switch a. Each switch powers one or the other leg at all times.
The common terminal is one of three electrically active terminals on a 3 way switch not including the ground terminal that is located on the metal frame of the mounting ears. Any other combination and no light. The white neutral should only be connected to the light fixture not either switch. Three way switch works as as one switch is in the up position. Both switches have to same wiring setup. Three way switches work by alternating the power connection between 2 legs called travelers.
For wiring i have selected the standard way with a 37v lithium ion battery as the power supply. Another dead giveaway of a three way switch is the absence of on and off markings. The light only will turn on when both switches are down. Dont know if it ever work correctly or if it was originally wired wrong. There are a pair of wires that run between the two switches. Switch a works regardless of position of switch b.
If this switch is in the down position the second switch three way switch works as long as one switch is in the up position.
Gallery of 3 Way Switch Only Works When One Switch Is On
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