What is a switch loop?

A switch loop is a wiring configuration commonly used in homes or buildings to control a light fixture from two different locations using two separate switches. In a switch loop, a hot wire from the power source is connected to a switch and then another wire, called the switch leg, runs from the switch to the light fixture.

One of the most common types of switch loops is the two-wire cable loop, where a single cable containing two conductors is used to connect the switches and the light fixture. The hot wire is typically black, the switch leg wire is usually connected to the white wire with black tape or marker to designate it as hot, and the ground wire is typically green or bare copper.

Switch loops can be wired with either a single-pole switch or a three-way switch, depending on the desired functionality. Single-pole switches have two terminals, while three-way switches have three terminals to allow control of the light fixture from multiple locations.

It is important to follow local building codes and safety regulations when installing switch loops to ensure proper wiring and avoid any electrical hazards. If you are unsure about how to install a switch loop, it is recommended to consult a licensed electrician for assistance.