Hi, does this design sound right?
3 bed terraced house.
Living room, dining room, kitchen, 3 beds, bathroom, loft conversion and a small detached outhouse.
Using a split consumer unit:
Downstairs ring circuit for living room, kitchen and dining room.
Upstairs ring for 3 beds and loft conversion.
Downstairs lighting circuit.
Upstairs lighting circuit.
Electric shower.
Radial circuit for outside outhouse.
RCD protecting all socket rings and shower but not lighting.
The kitchen will have a fridge, freezer, electric cooker with a gas hob, electrick hood, microwave, kettle, toaster etc.
The outhouse will have a washing machine, tumble dryer, heater, a light and probably a double socket.
For now downstairs will have a standard ceiling rose in the living room, dining room, hallway, and maybe one or two in the kitchen. The kitchen may have spot lights put in when a new kitchen is fitted.
Upstairs will have 6 standard ceiling rose lights but might have spot lights installed when a new bathroom is fitted.
The electric shower isn’t going to be fitted until the bathroom is replaced but I am going to assume upto a 10kw shower may be fitted.
Downstairs ring on a 32A mcb. 2.5 T+E cable
Upstairs ring on a 32A mcb. 2.5 T+E cable
Downstairs lights on a 3A (or should it be a 6A?) 1.5 T+E cable
Upstairs lights on a 3A (or should it be a 6A?) 1.5 T+E cable
Shower: 10000 / 230 = 43A. 10 sqmm cable. Should it be on a 50A mcb?
Outhouse: Not sure on this. Would a 20A radial circuit using 2.5 SWA cable be upto the job? It’s a run of about 12-15m out to the outhouse from the CU. I was going to run in 6mm SWA cable on a 32A mcb but this might be overkill. Do I have to take into account voltage drop on this and if so, what would it be?
I am going to assume the use of a 3KW heater (not very often though, only when its cold and when washing is being done), A washing machine and tumble dryer at maybe 1KW or 1.5KW each. That’s a total possible load of 5-6KW if my estimates are correct. This would be too much for my 20A radial circuit unless I can apply diversity to the above (assuming ive estimated the power of the appliances correctly)?
For the outhouse, would I be better having a 2 way mini CU with one for the sockets and one for the lights or just running the SWA into sockets and taking a fused spur off for the light? The mini Garage CU I have seen has 1x 16A, 1x 6A and a 30mA RCD. I assume I don’t need an RCD if I already have one on the main house CU and the 16A and 6A wont be big enough for what I need it for.
Is there anything wrong with the design and can I have your views on the questions I have raised
Thanks
3 bed terraced house.
Living room, dining room, kitchen, 3 beds, bathroom, loft conversion and a small detached outhouse.
Using a split consumer unit:
Downstairs ring circuit for living room, kitchen and dining room.
Upstairs ring for 3 beds and loft conversion.
Downstairs lighting circuit.
Upstairs lighting circuit.
Electric shower.
Radial circuit for outside outhouse.
RCD protecting all socket rings and shower but not lighting.
The kitchen will have a fridge, freezer, electric cooker with a gas hob, electrick hood, microwave, kettle, toaster etc.
The outhouse will have a washing machine, tumble dryer, heater, a light and probably a double socket.
For now downstairs will have a standard ceiling rose in the living room, dining room, hallway, and maybe one or two in the kitchen. The kitchen may have spot lights put in when a new kitchen is fitted.
Upstairs will have 6 standard ceiling rose lights but might have spot lights installed when a new bathroom is fitted.
The electric shower isn’t going to be fitted until the bathroom is replaced but I am going to assume upto a 10kw shower may be fitted.
Downstairs ring on a 32A mcb. 2.5 T+E cable
Upstairs ring on a 32A mcb. 2.5 T+E cable
Downstairs lights on a 3A (or should it be a 6A?) 1.5 T+E cable
Upstairs lights on a 3A (or should it be a 6A?) 1.5 T+E cable
Shower: 10000 / 230 = 43A. 10 sqmm cable. Should it be on a 50A mcb?
Outhouse: Not sure on this. Would a 20A radial circuit using 2.5 SWA cable be upto the job? It’s a run of about 12-15m out to the outhouse from the CU. I was going to run in 6mm SWA cable on a 32A mcb but this might be overkill. Do I have to take into account voltage drop on this and if so, what would it be?
I am going to assume the use of a 3KW heater (not very often though, only when its cold and when washing is being done), A washing machine and tumble dryer at maybe 1KW or 1.5KW each. That’s a total possible load of 5-6KW if my estimates are correct. This would be too much for my 20A radial circuit unless I can apply diversity to the above (assuming ive estimated the power of the appliances correctly)?
For the outhouse, would I be better having a 2 way mini CU with one for the sockets and one for the lights or just running the SWA into sockets and taking a fused spur off for the light? The mini Garage CU I have seen has 1x 16A, 1x 6A and a 30mA RCD. I assume I don’t need an RCD if I already have one on the main house CU and the 16A and 6A wont be big enough for what I need it for.
Is there anything wrong with the design and can I have your views on the questions I have raised
Thanks