Maxim demand Q's again

ashlec · Nov 22, 2011

Hi All, im new to the forum, ive often browsed various threads with great interest...

I know there's been a fair bit said on this subject so sorry for bringing it up again,
im in the process of a timber frame new build ( 2 bed, 1 study/poss bed 3 )
When working out the maximum demand as p96/7 in the OSG its putting me
over 100a, we all know its never going to get close to that so what what can
i do about it ???
circuits are
2 x 6A lts
1 x 6A smokes
3 x 32A rings ( up/dwn/kit )
1 x 32A hob ( 6.6 Kw ) no gas in the village
1 x 32A oven ( 4.4 Kw ) '' '' ''
1 X 16A for imm ( only 13A )
1 x Air source oil heating system elec supply unknown

so not including the air source heating & the smokes im getting 112.82 Amps,
how can i get around this, all views are welcome....

Octopus · Nov 22, 2011

With the press for greater segregation between circuits in houses (i.e. install more) this issue isn't going to go away.

A house as outlined won't be drawing much more than 60A max so don't be too concerned about it.

NB: Put your smokes on a lighting circuit.

nick611 · Nov 22, 2011

the hob and oven should be added together and the diversity worked out as a demestic cooker. you wont need more than 100amps. And you wont get it off supplier. so 18kw will have to do

Engineer54 · Nov 22, 2011

You'll rarely see more than around 45 to 50A on that installation, the same as most 2 to 3 bedroom properties....

Why you are providing 2X 32A circuits for the cooking loads i haven't a clue!! One 6mm circuit with a 32A protective device will cater for upto 15 KW of cooking load before diversity.... And as suggested put your smokes on a lighting circuit if your that worried about Max Demand, personally i wouldn't sweat it!! lol!!