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I'd need to know the operating voltage, because if the operating current is high and the voltage is low, then you would need rather thick wire. If you are using a high voltage application, Wiring could be brought down a bit. Let me know!
A rough guide is to divide kVA by the supply voltage then multiply by 1000 to get current in Amps. E.g. 20kVA divided by 120V is 0.167; times 1000 is 167 Amps. But kVA is not the same as kW, so more information is needed before equipment is used.