Please help DNOs KVA……??

[Heyyall]

Hi all,

I’m getting confused as to what the DNO are going to be installing as there main supply and as you all may be aware they tend to be a little shy at replying back.

We have been told ukpn will be supplying us a maximum of 270kva to a block of 24 apartments.

I am assuming this will be 270 kva three phase, being 200 amps per phase (I can’t imagine it being 400 amps per phase)?
Could anyone confirm this in their past experiences?

I’m querying this as I need to know sizes for tails and isolators before they come to connect the main head.

Any help/advice be appreciated.

 

[pc1966]

270kVA = 1174A single phase 230V = 392A 3-pase 400/230V. Basically 400A

I fear you are bit out of your depth here.

 

[plugsandsparks]

kVA to amps (A) conversion calculator

Kilovolt-amps (kVA) to amps (A) conversion calculator and how to calculate.

www.rapidtables.com

Give that a go... think 400A is what they are proposing, hopefully the head has got smaller as its a bit of a beast, lol

 

[Heyyall]

kVA to amps (A) conversion calculator

Kilovolt-amps (kVA) to amps (A) conversion calculator and how to calculate.

www.rapidtables.com

Give that a go... think 400A is what they are proposing, hopefully the head has got smaller as its a bit of a beast, lol

Thanks for reply. Would you happen to know roughly dimensions of the head. I’m hoping 600mm x 850mm (width x height) will be enough space.

 

[davesparks]

Thanks for reply. Would you happen to know roughly dimensions of the head. I’m hoping 600mm x 850mm (width x height) will be enough space.

UKPN will have supplied you with this information, if not then you can ask for it, along with their requirements prior to connecting.

It's not just the size of the cutout itself but also the working space around it that is required.

Also note that you have been given the maximum possible KVA of the supply, what you actually get may be less than that and will possibly be what was asked for on the application.

 

[Rockingit]

As others have said - without sounding unkind, are you confident in your abilities with this project?

 

[davesparks]

If you register for access to the UKPN document library online you can view a lot of their design standards and drawings for standard new supplies.

For this question you may want to have a look at
EDS 08-1103 supllies to multiple occupancy buildings
EDS 08-2100 LV customer supplies (covers supplies from standard single phase up to 1500KVA)

EDS 08-2110-08, EDS 08-2110-10, EDS 08-2110-11, EDS 08-2110-19 are drawing of various different cutout arrangements that may apply to this particular supply.

 

[Heyyall]

As others have said - without sounding unkind, are you confident in your abilities with this project?

I’m just asking for a bit of advice mate. As I have said……DNO not handing information over. Exactly why I’m on this site asking.

 

[Heyyall]

If you register for access to the UKPN document library online you can view a lot of their design standards and drawings for standard new supplies.

For this question you may want to have a look at
EDS 08-1103 supllies to multiple occupancy buildings
EDS 08-2100 LV customer supplies (covers supplies from standard single phase up to 1500KVA)

EDS 08-2110-08, EDS 08-2110-10, EDS 08-2110-11, EDS 08-2110-19 are drawing of various different cutout arrangements that may apply to this particular supply.

That’s great advise. Thanks a lot.

 

[James]

Bear in mind that tails for 400A are difficult to manage, even as singles, 240mm rings a bell but would have to check with the dno.
make sure there is plenty of space for the cable bends as they will be quite large, 300mm rad would not be unusual.