What size wire for 600 amp 480 v 3 phase?

For a 600 amp, 480 V, 3-phase system, you would typically use 3/0 AWG copper wire or 250 kcmil aluminum wire, depending on the installation conditions and applicable code requirements. It's essential to consider factors such as the length of the run, ambient temperature, and any derating factors that may apply. Always consult the National Electrical Code (NEC) or a qualified electrician for specific applications and local regulations.