Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

In the diagram on the link they are using a three conductor cable after the first three way switch. Black, Red, and White with a separate ground.

Here's how to swap outdated three-way light switches for something much better.

There are two types of light switches, says Donnelly: a single-pole light switch, which has two wires, and a three-way light switch with three wires that usually look identical.

My house was built in the 50s, with wiring from that time period. I'm trying to understand how to connect a modern switch up in the place of an existing old one and it just isn't making sense to ...