Sizing a Padmount Transformer (Mixed Three Phase and Single Phase Load)

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Electrical Engineer
Greetings All,
I am trying to size/validate the rating on the medium voltage transformer for a project. For some reason I can't find many resources that indicate how to properly do this when you have mixed loads (Three Phase and Single Phase). What Size transformer will be needed?

The Need:
1000 AMP SES (600 Three Phase and 400 Single Phase)
Based on my calculation, I am thinking that I have demand load of (343.8kVA) (This total three and single phase load combined) which means I need 300kVA

I am planning to use 120/240 Padmount Delta Transformer

Any guidance would be greatly appreciated!
 
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