max demand for flats

[J.C.E]

Just double checking calcs if anyone bored!

So for a block of 3 flats with no gas services- all flats same. +communal stairs over 2 floors (LED light few small panel heaters)

Flat:
Kitchen Ring (32a) (32)
Ring (32a) (12.8)
Oven (20a) (13)
Hob (32a) (16.6)
Immersion (16a) (16)
Lights1 (6a) (3.9)
Lights2 (6a) (3.9)
Heating1 (20a) (2x Dimplex Monterey Panel Heater - 2000w) (15)
(Heating2 (20a)(2x Dimplex Monterey Panel Heater - 2000w) (15)
(heating3 (20a) ((2x Dimplex Monterey Panel Heater/towel rail - 1000w) (15)

Do I stick with 32+32+20+32+16+6+6+20+20+20 x0.4= 81.6amps

Advise a TPN 100a supply is needed- and stick a 4way Ryefield in with 3x 100a fuses (flats)+ 1x 60a (L/L)

OR
32+12.8+13+16.6+16+3.9+3.9+13.7+13.7+13.7=139.3!!!!!

my heads telling x 0.4 would be fine- but I know thats just the quick/lazy method
appreciate any advise

 

[The Ghost]

I get 101a per flat. That is
32a x 2 = 64
4x 20 = 80
2 x 6 = 12
+ 16
= 172x 40 % = 68.8 + 32 = 101a
But in reality would shave those figures down by applying diversity to cookers/heaters and so on. I would agree Ryefield 100a 3p+n dunno what the 60a is for?

 

[telectrix]

bet each flat will rarely pull over 40A.

 

[Leesparkykent]

X 0.4 is fine mate IMO. I'm sure the smallest TPN Ryefield they do is 6 way.

 

[J.C.E]

whats the 32a thats added after the x0.4 for?
cheers

 

[J.C.E]

X 0.4 is fine mate IMO. I'm sure the smallest TPN Ryefield they do is 6 way.

cheers lee
RY4 - 4 Way Ryefield Board complete with 60A Fuse Units, 4 Way Service Head Distribution Board - https://www.sparksdirect.co.uk/4-way-ryefield-board-complete-with-60a-fuse-units-4-way-service-head-distribution-board#.WMRJxBBJH3A

 

[Leesparkykent]

cheers lee
RY4 - 4 Way Ryefield Board complete with 60A Fuse Units, 4 Way Service Head Distribution Board - https://www.sparksdirect.co.uk/4-way-ryefield-board-complete-with-60a-fuse-units-4-way-service-head-distribution-board#.WMRJxBBJH3A

That's single phase mate.

Edit: no it is TPN

 

[Leesparkykent]

RY6100 - 6 Way Ryefield Board taking 100A Fuse Units, TPN 6 Way Ryefield Distribution Board - https://www.sparksdirect.co.uk/6-way-ryefield-board-taking-100a-fuse-units-tpn-6-way-ryefield-distribution-board#.WMRINTamnIU

RY6 - 6 Way Ryefield Board 60A, 6 Way TPN Ryefield Service Head Distribution Fuseboard with 60A Fuses inc - https://www.sparksdirect.co.uk/6-way-ryefield-board-60a-6-way-tpn-ryefield-service-head-distribution-fuseboard-with-60a-fuses-inc#.WMRKmjamnIU

 

[J.C.E]

opps

 

[The Ghost]

So onsite guide pg. 118 you see highest load plus 40% of remaining load. Hence 32a at the end there are three I only factored in 2.

 

[Wilko]

Hi - I used the OSG, busted 110A and started drinking. Doesn't seem right, does it ? (I mean the current draw)

 

[J.C.E]

So onsite guide pg. 118 you see highest load plus 40% of remaining load. Hence 32a at the end there are three I only factored in 2.

do you usually use this method then? no way a 2bed flat will need 101amps

 

[Leesparkykent]

opps

No mate you are correct it is TPN..Says in the description. Threw me as didn't sat TPN in the title Panic over

 

[Leesparkykent]

X0.25 would be more accurate IMO. Which equates to around 51A a flat.

 

[The Ghost]

usually use this method then

Only for filling the part about Max demand in cert. As I say I would apply diversity to the items listed and actually work out a lower figure for the purposes of reality.