Wiring question - light switches

[Monsterlime]

We have a 20 odd year old house, that has neutral to all of the light switches which has meant fitting smart switches to be reasonably easy, with one caveat.

Most switches just control 1 or 2 lights/fan and all is good. However, we also have multiple switches that control the same light or set of lights. IE there are two separate switches for our kitchen lights, in different places and both work independently.

For our upstairs landing/hall lights there are 3 switches - a downstairs one, one at the top of the landing and one at the end. There are blue and yellow wires in each, and from what i can see (and will put pictures below), that wiring goes from downstairs to the first upstairs switch and then a second run goes to the switch at the end. Red is live.

Downstairs -


Landing -


End of upstairs hall -


How, or is it even possible to wire this switch (and there are ones with 2 buttons etc), in each location, to do the same -

Smart switches - https://www.szneo.com/en/products/show.php?id=235

Back of new switch -


I have tried getting an electrician to do it, but nobody has responded as yet so would like to know if this is even possible.

[Road2Ruin]

The middle picture looks like an intermediate switch. Difficult to tell exactly from the angle. You would need a similar switch type to replace it with.

[Monsterlime]

Ahh, thank you, that now gives me something to look for as I had no idea what it was even called.

A bit of Googling showed me this from a different manufacturer - https://shop.lightwaverf.com/blogs/news/2-way-swit...

Website said:

What if I have more than two switches in the circuit?

This is typically known as intermediate switching. It’s largely the same as two-way switching, but there is a specialised switch in the middle and additional wiring. You can spot this switch by looking at the back of it - it will have two sets of L1 and L2 terminals.

To add a Lightwave dimmer to this set up, you still need to follow all the steps above, but when you come to this particular switch, you need to move one set of L1 and L2 wires to the L terminal on the Lightwave switch and then move the other L1 and L2 wires to the X terminal on the Lightwave switch.

I will need to go back to the manufacturer of my switches and see if they support this.

[CharlesElliott]

The info tabs on the website don't work for me, but often smart switches do not directly support 2-way (or multi-way) switching. The idea is that you wire one switch - the one that is currently physically connected to the lights - with one of the smart switches. Then you wire the other smart switches just with neutral / live and no output connected. Now you use the app (or whatever) to configure those switches in a group for two way switching. You will probably need to slightly rewire the intermediate wiring so you have a neutral / live at each switch and no other live wires.

[CharlesElliott]

Lightwave don't do intermediate switches anymore either. They used to, but now they use the approach I outlined above.

[Monsterlime]

Aahhh, ok! Thanks

As it happens, I think there are 2 way switches in the Neo line up, I just hadn't realised.

What I have - https://www.szneo.com/en/products/show.php?id=201

And the ones listed as 2-way - https://www.szneo.com/en/products/show.php?id=235 which I mistakenly linked to start. If I can find these, they will solve the Kitchen issue but I think I will keep seeing if I can get an electrician assist with sorting the upstairs lights.

There is a live connection in the box for the intermediate switch, so hopefully the other approach is possible. I use Home Assistant, so the automation would be easy.

[Mr Pointy]

For future refence there's lighting wiring circuits here:

https://flameport.com/electric/lighting_circuits/i...