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.

 

[The Ghost]

Doesn't seem right

No, and it probably is not. It is just calculating for a theoretical load supposing a person in the flat had hypothermia tendencies and kept tropical things like snakes, and likes to eat 14 times a day (including the boa, fatted calf!) with a full roast in the oven and on top who also has a morbid fear of the dark and hates anything but incandescent filament lamps so has all the lights on and who is constantly filthy so has to keep loads of hot water to keep cleaning them and their clothes, and loves hot towels, never mind about their partner.

 

[J.C.E]

m

No, and it probably is not. It is just calculating for a theoretical load supposing a person in the flat had hypothermia tendencies and kept tropical things like snakes, and likes to eat 14 times a day (including the boa, fatted calf!) with a full roast in the oven and on top who also has a morbid fear of the dark and hates anything but incandescent filament lamps so has all the lights on and who is constantly filthy so has to keep loads of hot water to keep cleaning them and their clothes, and loves hot towels, never mind about their partner.

my ears are burning

 

[Wilko]

No, and it probably is not. It is just calculating for a theoretical load supposing a person in the flat had hypothermia tendencies and kept tropical things like snakes, and likes to eat 14 times a day (including the boa, fatted calf!) with a full roast in the oven and on top who also has a morbid fear of the dark and hates anything but incandescent filament lamps so has all the lights on and who is constantly filthy so has to keep loads of hot water to keep cleaning them and their clothes, and loves hot towels, never mind about their partner.

Perhaps PhotonicInduction wrote that part of the OSG ?

 

[Octopus]

Are you running the immersion off economy 7?

Lights would be 1A max if Leds used...

Just goes to show how unrealistic the diversity calculations are

 

[J.C.E]

Are you running the immersion off economy 7?

Lights would be 1A max if Leds used...

Just goes to show how unrealistic the diversity calculations are

No eco 7 board
But 24hr mechanical timer for immersion but obviously can be over ridden