3-Phase Supply

[bobby62]

What is the typical kV load for a standard 3-phase electric supply to a large house?

 

[toasty]

0.4kV phase to phase.
0.23kV phase to neutral.

Do you mean KVA? If so then 69 I would imagine (100amp supply)

 

[ricicle]

Surely you mean Kva? How large is large. 6, 8, 18, 24, 60 bedrooms ??

 

[bobby62]

Surely you mean Kva? How large is large. 6, 8, 18, 24, 60 bedrooms ??

Sorry, my fault. I mean kVa, I was just curious how much a standard 3-phase supply cable will carry? The house has 5 bedrooms and an indoor pool.

 

[Spark123]

100A 3 phase, as toasty says is 69kVA spread equally across the 3 phases.

 

[bobby62]

100A 3 phase, as toasty says is 69kVA spread equally across the 3 phases.

Thanks,

Just out of interest, does a standard single-phase typically carry 20kVA?

 

[toasty]

If it's a 60amp supply then it's 230 x 60 / 1000 = 13.8KVA
If it's a 80amp supply then it's 230 x 60 / 1000 = 18.4KVA
If it's a 100amp supply then it's 230 x 60 / 1000 = 23KVA

 

[stunlawless]

Rating for 3 phase was debated recently

//www.diynot.com/forums/viewtopic.php?t=170818


Regards, David

 

[bobby62]

If it's a 60amp supply then it's 230 x 60 / 1000 = 13.8KVA
If it's a 80amp supply then it's 230 x 60 / 1000 = 18.4KVA
If it's a 100amp supply then it's 230 x 60 / 1000 = 23KVA

How can you tell whether you have a 60, 80 or 100A supply?

Is it what the fuses are rated at.. rather than a larger single-phase cable coming into the property?

 

[Spark123]

What does it say on the electricity boards fuse next to the meter?

 

[bobby62]

My supplier has asked me to provide a supply requirement in order to run a new 3-phase supply, having told them I need a 'standard' 3-phase supply at 69kVA they say this is a very big supply and I need to re-check my requirements.

What is the general kVA requirement for lighting/small loads in a large 6 bed house? I can add the rest to this and try to provide a more accurate figure. Was thinking more like 40kVA?

 

[nozspark]

100A 3 phase is 40kVA

When I first worked it out I thought "Eh!!", but thats what it is!!