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main switch, 3 pole, RCD 2 pole I dont remember now, there was difficult acces to CU, anyway, there was not action when I pushed T - test CU - see pic, look similar

What I saw today, this is CU, I tried to discribe this CU on my drawing. I have no experience on domestic installation, but something like this I saw first time. What is protected by RCD?

Uo is 230v regardless of whether it is a single or three phase circuit that is the answer, I just wasnt sure about this where to find max earth fault loop impedance for each MCB? in 17Th book Thanks

1. I want to install water heater 8kW, separate circuit. Do I need put a switch between Fuse board and water heater? 2. another problem - 14kW water heater 3 phase, this is 21A, how to find right fuse? in 17Th edition there are values for U=230V,where to find max earth fault loop...

I decided to put cable under the floor, it is possible, but there is a spur feeding 3 sockets in conservatory!!!!

I decided to put cable under the floor, it is possible, but there is a spur feeding 3 sockets in conservatory!!!!

cable path2

thanks for all funny respond, so i am starting as a domectic electrician and putting cables under froll is new for me. I am usually work on industrial. I try to do my work according 17Th edition, tomorrow I check my work place to ensure how to do it, I will share about

in my opinion to put cable under the floor could be too expensive because there is a carpet fixed to the floor. Spur could be reasonable. Can i feed socket from main ring which is outside the room??

Of course I have to find two right sockets, disconnect and extend cable to another socket, as you see on my drawing. dont know yet, but probably under floor

I don’t want to interfere too much in installation, I thought about spur but it has to be too long (about 7 meters)

I need extend main ring, and it is not reasonable to put cable on ceiling or under floor, because of cost too high, see dra wing

cable path

Can I put cable above doorway in wall between 150mm from ceiling? regards