Intermediate Switches
An intermediate switch is designed to let you control a single light or set of lights from more than one location (usually 3 or more). Often used in a system with two-way switches an intermediate switch is often called a 3 way switch, allowing for added convenience in both homes, offices and other commercial settings.
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Click Definity Complete Matt Bronze with Black Insert Screwless 1 Gang Intermediate Switch SFBZ425BK
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What is an intermediate switch and how is it different to a standard light switch?
An intermediate switch is used in a lighting circuit where you want to control a single light (or group of lights) from three or more different locations. Unlike standard one-way or two-way switches, which have two terminals or three respectively, intermediate switches have four terminals and are wired differently to allow this extra level of control.
How do I wire an intermediate switch?
Wiring an intermediate switch involves connecting it between two two-way switches in a multi-way lighting circuit. An intermediate switch has four terminals. They are usually marked as L1, L2, L3, and L4 (or sometimes as two pairs: IN and OUT). To wire it:
- Take the two straps (or strappers) coming from the first two-way switch and connect them to one pair of terminals (L1 & L2).
- Take the two straps going to the second two-way switch and connect them to the other pair (L3 & L4).
- When correctly wired, the intermediate switch simply crosses or maintains the connection between these pairs, depending on its position allowing any of the three switches to turn the light on or off.
Important: Intermediate switches should only be installed as part of a three-way or more switching setup. If you’re unsure or working with unfamiliar wiring colours, it’s strongly recommended to consult a qualified electrician to avoid errors.