Consumer unit loading

[goldie]

We are looking to add a circuit to a new outbuilding but need to work out what supply we can use from our existing consumer unit (Connection to supply to be done by electrician as per part P). The house is 2 years old and is curently on what was installed at the time of building. We have a 100A supply and the board currently contains:
6A for smoke detector
2 x 6A for lighting
16A for immersion
and then on the rcd side:
32A for hob
32A for cooker
2 x 32A ring mains
16A for garage.

We could either uprate the garage and run the outbuilding off it or have a new direct supply to the outbuilding.
How do we work out diversity? Do we have any spare capacity.

[ericmark]

“How do we work out diversity?â€

[sparx]

Hi , for what it's worth I am totally with Eric here, you will never overload your 100A supply in normal use you have huge inbuilt diversity ,
eg, 2X6a= 2760 watts of lighting on at same time?
smoke detectors draw abt 10 mA each so can be ignored.
oven load rarely more than 12A actual load (hobs a bit nearer 32A occasionally)
get leckie to change existing 16A circuit to something like 32A on 6mm feed to @garage-unit@
you cannot have more than one supply to a property so thats out anyway, (electricity supply regs don't allow it.)
Also supply co. won't give new 3 Ph supply to domestic properties,
don't fret part_p sparky should confirm,
regards SPARX