I am planning an extension and want to use zwave automation to provide control of lighting, blinds, opening rooflights etc. At the moment I have around 20 different items or lighting groups/circuits to control for a large kitchen/diner/lounge. Given this is all new build I am wondering how I design the wiring and the positioning of zwave relays etc for the extension.
Is it best to site all relays on a din rail next to a new consumer unit ? This seems attractive for maintenance and access. However I am concerned this would mean running cables from all physical wall switches in the extension back to this din rail as well as all the power to these 20 devices. This seems like a massive amount of wiring.
Is it best to site relays behind the switches ? But some switches will be 3 or even 4 gang switches and this would seem to need 2 zwave relays somehow fitted into the switchbox.
Is it best to site relays near the device (e.g. Blind, ceiling light void) ? But this doesnt seem to make for easy maintenance access.
Do I need to mix and match the 3 above approaches ?
I would be grateful for any help, advice or pointers to good information sources. I fear it will be impossible to find an electrician that is familiar with designing zwave automated circuits and so feel I need to try and come up with a design myself to give to the electrician to cable up - first fix/second fix etc.
(PS I wanted to retain physical wall switches as the wife wont trust a purely wireless system, but maybe I should sacrifice some physical switches in favour of virtual/associations).
Thanks for any help, I am new back to this community after 2 + years absence.