If you’ve mounted two switches in the same electrical box, prepare two black wires. Connect one end of the 6-inch wire to the top terminal of the first switch. Twist the other end together with the black wire from the incoming circuit cable and the black wire from the cable going to the second switch to form a pigtail.

Both 2 Way and 3 Way switches are SPDT switches. But 3 Way switches have an extra pin called ‘Grounding pin’, which is not present on 2-way switches. 2 Way Switches have 3 screws, whereas 3 Way Switches have 4 screws. But irrespective of that, in both cases, you can employ 2 switches to control the load.

You can do this light switch wiring in one of two ways. The most common is to daisy-chain the light fixtures by connecting them to each other and hooking the first one up to the switch. The other way to wire multiple lights to one switch is to connect all of them directly to the switch in a “home run” configuration.

Daisy chaining is a simple way to connect two or more light fixtures. Multiple light fixtures operated by a single switch can be most easily wired through a process known as “daisy chaining.” This is a simple, serial wiring scheme that connects the wires of the light fixtures one to the next in a single circuit.

If you’re replacing two 3-way light switches at the top and bottom of a stairwell or at either end of a hallway, you might think you need two 3-way dimmer switches, but you actually only need one. When using a 3-way dimmer switch, you should only have one dimmer on the circuit.

2 Way Switch vs 3 Way Switch Both 2 Way and 3 Way switches are SPDT switches. But 3 Way switches have an extra pin called ‘Grounding pin’, which is not present on 2-way switches. 2 Way Switches have 3 screws, whereas 3 Way Switches have 4 screws.

If you look at a 3-way switch you’ll notice it looks different from a standard “single pole” switch. The actual switch is larger because there’s more going on inside. And there’s an extra screw terminal on the side that allows a connecting point for an extra “common” wire so the switches can “talk” to one another.

To replace a three-way switch, follow these steps: Turn off the power to the switch at the circuit or fuse panel. Unscrew and remove the switch plate; then use a voltage tester to make sure that the circuit is dead. Unscrew the switch from the electrical box and pull it out with the wires still attached.

A three-way lamp switch allows the lamp to provide three different levels of illumination. Related Articles. A three-way lamp has a four-position rotary switch that, when combined with specially-designed light bulbs, can switch between lighting the bulb at relatively dim, moderate and bright levels — and, of course, off.

Turn off the power to the light circuit at the main panel. Tag or otherwise mark the circuit breaker to alert others of the work you are doing.