What Is the Difference Between a 2-Way Switch and an Intermediate Switch?

The main difference is how they're used in combination with other switches. A two-way switch works with one other switch to control a light from two locations. An intermediate switch is needed when there are more than two switches on the same lighting circuit.

When to use two-way switches

Two two-way switches are all you need when a light is controlled from exactly two locations — for example, a switch at the top and bottom of a staircase.

When to use intermediate switches

Intermediate switches placed in the middle of a circuit, between two two-way switches, are needed when a light is controlled from three or more locations — for example, a staircase with a landing partway up, needing a switch at the bottom, one on the landing, and one at the top.

A staircase with a landing

This is the classic example: a two-way switch at the bottom of the stairs, an intermediate switch on the landing, and a two-way switch at the top. The two outer switches are wired as standard two-way switches; the intermediate switch sits between them and doesn't connect directly to the live supply or the light itself.

Frequently Asked Questions