maximum demand kva 3 phase

[daveb1]

looking to get a bit of help got a job that currently has 8 flats and a landlord supply and a big office on the ground and basement

After using the OSG for diversity have come up with the following

118A per flat (no gas)
127A for landlord (lift etc)
180A for office (air con)

118x8=944+127+180=1251AMPS this seems way to much i know! but would rather cover myself so when the office are giving these to the supply company they are asking for kva?

At the moment they have a 200A 3 phase supply

The developers are looking to change the office into 3 more flats so 3X118=354amps more

so with the office gone we are looking at a total of 1425Amps (sounds like its getting confusing)

so my question is how can i get a kva value for the supply company? with 1425A 3 phase

Any help would be appreciated Thanks Dave

 

[daveb1]

But my question is do they use diversity for the value i will give them?

 

[iamelectric]

phone them up and ask them

 

[daveb1]

I dont need to! I know the answer its you lot that i am asking asking?

 

[iamelectric]

of course they do

 

[daveb1]

It is interesting seems like it is the right way of calculating it after all then.

 

[Old Jag Lover]

200A 1 phase services very common in oz now,but at a guess a 500kva tranny would be ok,diversity plus reputable English and yank stuff can handle 300 percent overloads for 10 hours at a time with no effects.200A service due to the 80 percent rule means 160 plus POCO here will usually still only install a 100A service drop,they have their own rules,free air that sort of thing

 

[i=p/u]

Well I think 0.4 for everything seems right .. From what I see. I normally use highest breaker + 40% of rest and it's too high ,but I write it in if under a 100A. But think il use 0.4 on everything now, which will equal around 50-60A for standard domestic ... I've learn from this thread.lol