What is the difference between a 2-way switch and an intermediate switch?
The key difference lies in how they work together within a lighting circuit. A 2-way switch can be paired with another 2-way switch to control the same light from two different positions. However, if you need more than two switches on the same circuit, you must include an intermediate switch.
When to Use Intermediate Switches
Intermediate switches are installed between two 2-way switches. They allow the light to be switched on or off from additional points while still keeping the two end switches functional.
When to Use 2-Way Switches
Two 2-way switches can be used together to control one lighting circuit from two locations. They are also required at either end of a circuit where intermediate switches are used in between.
A Summary of What to Use and When
- One switch: 1 × 1-way or 2-way switch
- Two switches: 2 × 2-way switches
- Three switches: 2 × 2-way switches + 1 × intermediate switch
- Four or more switches: 2 × 2-way switches + the remaining as intermediate switches
Can You Use Intermediate Switches as 2-Way Switches?
Yes, but it’s not usually recommended. Intermediate switches are more complex internally and therefore more expensive, so they should generally only be used where intermediate switching is required.