Use 3 -- 6 gauge copper wires, you could get by with 2--6 gauge wires for the two hot phases and 1--8 gauge for the neutral connection,but with that long a run use all 6 gauge so you don't experience any voltage drop,also in your community you may need to check the local codes on grounding and need to add a separate grounding wire,which you can use an 8 gauge for this wire connection, if you use aluminum wire(which I highly DO NOT reccomend) you will need to get one gauge larger as in 3--4 gauge aluminum to carry the same current as copper wire
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