2 way switching and Wi Fi switching

[South Spark]

At 1st fix stage. Customer has decided they want option for wifi switching.

There's 2 way and intermediate switching involved that I was going to do conventionally with 3 core cable.

Obviously now I'm going to provide a neutral at each "main" switch but what about the rest?

 

[westward10]

I believe you would only require the neutral at one point. The other switches will become redundant and would need linking out.

 

[littlespark]

Depends on the switches you use.

Some utilise the 3core already there to give connection to a slave switch... the master being the main one.
2 cores are L & N, to power the slave, the 3rd core being just a extra low voltage signal.
Connect it up wrong and risk 230v into the signal terminal. Leading to dead switch!
For intermediate, just loop each core into the slave switch... ie 2 Lives, 2 neutrals, 2 signals

Some systems use battery powered slaves that connect to master via radio. Good if there isn’t already a 2 way circuit, and you can put the slave anywhere... ie at a bed headboard