TonyT

T piece hidden in the wall😩

Cut a joist out and frame it like you would say for creating a loft hatch and let the units site in the opening. Remember to find a suitable place for the condensate to drain to

You worry too much, add extra noggins if you think you are weakening the timber by drilling a hole, sheet the front with OSB as nick says also gives the benefit of decent fixings for everything you screw to the wall. im a 18mm plywood fan for this, in kitchens, bathroom, staircases as you are always getting a decent fixing for units, sinks handrails etc. saves grief, saves time. better result

40mm for me one size up, saves long term grief

A piece of wood larger than the hole, screwed over the hole?

A little joint box enclosing all the conductors would be good otherwise it’s a negative mark when any testing and inspection is carried out

Does the agreement/contract state they will be fitted a certain way? just more evidence for you if you haven’t thought about that.

Shelly power meter it’s the din rail version and comes with 3 ct clamps either for 3 phase or 3 single phase circuits Nice app. Easy to fit

Yeah I think you are needing a rewire 😜

Proper colours are red yellow and blue

3 phase for solar PV too, more phases to get more panels!!

Weather compensation all the way! otherwise it’s just engineers who don’t want to invest time in setting up/commissioning boilers as they will get less call backs

Do you run your rain water pipes internally too?

I would have recommended doing it right the first time, to save duplication of labour and additional costs and asking for advise prior to the works being carried out small racks are Inexpensive.

100%. Very knowledgeable chap comes across well on his videos

Are you in the UK?

From British Gypsum for partitions, screws are 300mm centres (200mm centres at external angles). For ceiling systems, the screws are located at 230mm centres within the field of the board and 150mm centres at board ends.

https://www.screwfix.com/p/mcalpine-boss-connector-white-22mm/719hr

Is this hole in the concrete?

Strap on boss connector

👏

French cleat?

2.5mm2 is more than adequate, tell joiner you are worried about the thickness of the partition timbers and start him worrying!

Insulate first then run services? Sound insulation?

How far away if the consumer unit?