feed wire for a 30KVA 3ph transformer

[KC2LLW]

Hello,
Just want to check my wire size. I am feeding a 3Ph 30KVA 480 IN 240 OUT transformer from a 480 buss-way about a 20' run. would i be able to use #4 AWG THHN wire to feed the transformer? the transformer will be running a heat tunnel that's rated at 64amp 240V 3Ph the tunnel has a cord with #2 AWG wire.
Thanks,
Steve

 

[charlie b]

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