You'll need to know the total amperage of all the appliances that will be run off the line, whether you have single or three phase and the voltage on the circuit. Then go on the web and do a search for an electrical wire size calculator.
If you are having the box installed by a licensed electrician, he (she) should have no issue sizing the wire for you (you still have to calculate the amperage of all appliances) If you are on the edge between two wire gauge sizes, go bigger.
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