Smart Switch 2 gang wiring help

[MartinWD]

Hi. I've just bought a Sonoff 2 gang smart switch (UK version) which requires neutral wire. My new house has neutral wires running to the light switches but they're capped off.

My question is I'm confused by the number of wires and wondering specifically which live and neutral wire do I use? Below is a picture of the existing dumb switch which has 3 live wires going to each switch and there are 4 capped off neutral wires. The Sonoff wiring diagram (also below) shows only one neutral wire to the new smart switch and one live wire so which do I use?

Existing switch wiring:

Sonoff Smart Switch Wiring Diagram:

 

[Avo Mk8]

You need to interpret the Sonoff diagram into what you see on your light switch. I'm afraid the forum is not supposed to give step by step advice, but perhaps thinking in the terms below might help:

Sonoff shows an incoming L wire on the left, a tap off that to the switch L, and outgoing L on the right. 3 wires in all. Think how you can replicate that with the incoming and outgoing brown wires (eg those in the COM terminals) and Sonoff L.

Similarly the Sonoff diagram shows incoming N on the left, a tap to Sonoff N, a N feed to bulb 1, a N feed to bulb 2, and an outgoing N, 5 wires in all. You have the four N's which the Sonoff diagram tells you to connect to N, just need to add the connection shown.

If this doesn't make sense, suggest you ask an electrician to assist.

 

[EricMark]

It seems unlikely there will be a problem linking to neutral in your case, however in general one has to be careful, the 4 gang light switch by my front door, has two independent supplies at 230 volts, and also an extra low voltage supply.

Before buying the house, someone had got the neutrals mixed up, which did not stop anything working until RCD protection was fitted, once that was fitted the borrowed neutral had to be sorted.

I have had it where the new two, three, or four gang switch uses one line feed, but the old switches did not, so no simple way around it, you need to test.

 

[littlespark]

As #2

Just be aware the blues are all one neutral joint, you need to take another wire from this joint to the sonof.
There will be no space in the sonof terminal for all 4

If the blues become separated, you’ll have no return path for other rooms in the house, meaning one or more lights on the circuit will not work.