ᐅ Installing Intermediate Switches with 4 Switches – Single-Pole Double-Throw (SPDT) Switches?

Good evening,

I looked into how to install two-way and intermediate switches. In the example I read, it involved three switches. For that, you need one intermediate switch and two two-way switches. So far, so clear.
But what if you have four light switches? Do you then need two two-way switches? Or, for simplicity, can you use all intermediate switches?

You only ever need one intermediate switch.
Try using push buttons and a step relay; that is simpler.

For a three-way lighting circuit, you always need two toggle switches (which are placed at the two “ends” when you draw the circuit) and for all other switches in between, you need intermediate switches—regardless of how many there are (including zero intermediate switches, which means it’s just a pure three-way circuit). A toggle switch can easily be replaced by an intermediate switch (with one terminal left unconnected); it functions the same but of course costs a bit more. I don’t understand why this should be complicated or difficult once you’ve understood the principle, but I still recommend using push-button switches. Otherwise, people who are as neurotic as I am will constantly go around setting all the switches to the preferred position 😀 (and if things go wrong, the light might not even turn on, with one switch always in the “wrong” position).

Alright, there are also two-way switches. We have momentary switches everywhere, but only 2 relays installed, because we don’t like the different switch positions either...

Hello,

I took another look around the house. There are indeed only 3 switches for that one lighting circuit. The other lamps often have 2 switches. Are two-way switches sufficient when there are two switches?

For 1 switch, use a single on/off switch. For 2 switches, use 2 two-way switches. For 3 switches, use 2 two-way switches plus 1 crossover switch. For 4 or more switches, use only push buttons and a pulse relay circuit.