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Transformer sizing for a motor starter

Transformer sizing for a motor starter

Transformer sizing for a motor starter

(OP)
Can anyone point me in the right direction, to correctly size a transformer for a 3 phase motor starter?  I am interested in calculating the correct power rating in KVA.  

I am not sure if this is correct, but I am using this formula:  KW = HP * 746 / 1000

KVA = KW * 1.5(Form Factor)

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