conservatory sub main?

[James_000]

I am in the process of building a utility room (small extension) and a conservatory. i was thinking of having a dedicated CU for these two in the utility room. Could i take say a 10mm T&E from a 40Amp MCB on the non RCD side of the house CU to the new CU as kind of a sub main. Or would i have to use a switchfuse and henley blocks and take it from between the house CU and the meter?

the utility room is only small but wil have 3 double sockets on a 2.5mm ring (32amp MCB), the conservatory will be on a 2.5mm radial (20amp MCB) 3 double sockets. there will also be 3, 6amp MCB's for utility room lights, conservatory lights, and outside lights

i will get a qualified sparky to check it once i have finished, its just that i want to as much myself as i can.

Any advice greatly appreciated

 

[Qedelec]

You might like to get an electrician in before you cover up the cables etc. No spark worth his salt would put his monica on a certificate if he had not seen the project through from the begining, he ain't got x-ray vision.
He could then give you the advise you need.

I'm not trying to be unhelpfull but this will require an Electrical Installation Certificate to comply with the regs.

 

[comms]

Instead of running the utillity as a ring why not use 4mm & run a radial the same as in the conservatory & use 32amp rcbo.

 

[Steve]

as you're running so much off this submain (5 circuits?) why not use a 50A MCB and 10mm² SWA, then it will be able to cope with all you throw at it, and future expension (shed electrics?)

 

[Lectrician]

depends what loads there are..........You may be 100% safe with an extension of the original lighting circuit, and poossibly just a new socket circuit - be it a 4mm radial, or a 32amp ring....

More info on what the circuits actually feed would be good.

Elec heating in the conserve?

Flood lights outside?

Huge lighting inside?

Assume washer/dryer??

 

[James_000]

thanks for all the responses guys.

the utility room will have a washing machine, microwave, freezer, but nothing more than that. the conservatory wil have a telly, radio, lamp. nothing really power consuming. heating comes from a normal radiator

as for lights there are no major power requirements here, just some strip lights and a couple of 40w spots. the outside light will be one or two 150W PIR units.

i want a ring in the utility room simply because the layout of the sockets sets itself up nicely for a ring. So all in all no massive power requirements needed but some future proof'ness would be nice... i also plan to install a single radial socket on the non RCD side of the utility CU for the freezer.

Is it me, or do the regs in this country seem really excessive. i was looking into part P earlier, it seems great if your a qualified electrician now, they must be overloaded with work. But if it stops DIY'ers killing themselves then perhaps its a good thing. I have always been cautious when doing electrics and i like to know why im doing something before doing it - if you see what i mean. And if in not sure then i either find out or ask.

Cheers