Three phase upgrade

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Danny-p

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Hi, looking for some help in regards to what size three phase i require.

Currently have a small apartment block of 3 flats, there is 3 phase coming into the property that splits to give 100 amp to each flat.

Im sure its 70kva three phase coming in,
 

i would like to upgrade the three phase to allow an extra 40kw split between the three phases.

am i right in saying a 120kva three phase Upgrade would cover this or is this too much or too little.

Any help would be much appreciated 

 
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