Maximum Demand

[PeterPan27]

Can someone help me work out a max demand

got a
40amp shower
32 amp cooker
16 amp radial
16 amp radial
32 amp ring
6 amp lighting
6 amp lighting

whats the calculation to work out max demand please

 

[Knobhead]

76.8A. As to how, it's in the books you're supposed to read.

 

[GLENNSPARK]

Can someone help me work out a max demand

got a
40amp shower
32 amp cooker
16 amp radial
16 amp radial
32 amp ring
6 amp lighting
6 amp lighting

whats the calculation to work out max demand please

yes...i want a large cake....all to myself....

 

[PeterPan27]

thanks for the demand mate.

could you give me the calculation so i can try work some other things out.. al my books are in collge and were off for 2 weeks,jst trying to work some stuff out,
thanks again

76.8A. As to how, it's in the books you're supposed to read.

 

[Knobhead]

If max demand ever get any where near the calculated figure, the UK power network will explode!

 

[Knobhead]

thanks for the demand mate.

could you give me the calculation so i can try work some other things out.. al my books are in collge and were off for 2 weeks,jst trying to work some stuff out,
thanks again

Glenn, you forgot the cream on his cake!

 

[PeterPan27]

im sory if you think ive insulted you or something by asking a question!! just trying to work few things out while im off.

 

[PeterPan27]

i was told you take the highest ( in this case the shower 40 amp)
then add all the rest up
then x then by 0.4
then add to 2 figures together??

so this case would be 83.2Amp

 

[Engineer54]

Using my own method of calculating maximum demand, i got closer to 60A!! And if that installation ever got to see anywhere near 2/3rds of that 60A for more than a few minutes it'll be doing well!! lol!!

 

[PeterPan27]

Ye i understand that it wont be anywhere ner that,, just wanted to know the calcution, as the calculation i was using to get 83.2A was from a very knowledgable forum member

Using my own method of calculating maximum demand, i got closer to 60A!! And if that installation ever got to see anywhere near 2/3rds of that 60A for more than a few minutes it'll be doing well!! lol!!

 

[Knobhead]

To give you an idea of MD. I ran my flat on a 16A MCB for a week as a trial. If I didn't use the kettle so much I'd get away with a 6A.

 

[Engineer54]

If this is for a C&G collage course work, then you'll have to use those methods stated in BS7671. Crazy i know, but if you don't you'll probably fail!! lol!!

 

[PeterPan27]

ive got the regs here , the only book i got at home but cant find no cals for max demand in it

If this is for a C&G collage course work, then you'll have to use those methods stated in BS7671. Crazy i know, but if you don't you'll probably fail!! lol!!

 

[Engineer54]

Diversity and maximum demand can be considered almost the same thing, as you use diversity factors in order to reach your calculated maximum demand!!

 

[Richard Burns]

This is the table from the OSG (red edition) that shows how they calculate maximum demand, but do read the top sentence!

 

[GLENNSPARK]

Glenn, you forgot the cream on his cake!

oh..go on then...