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A 600 MCM copper conductor with an insulation factor of 75 or 90 degree C is rated at 420 and 455 amps respectively. This is very large diameter wire to handle. The best way of wiring this service is to use parallel runs.
A 3/0 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 200 and 210 amps respectively. So depending on the insulation of the wire that is used, a parallel wire configuration will give you a total of 400 at 75 degrees C or 420
at 90 degrees C.
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