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Service entrance wire should be AWG #3 copper.
Need to know what size service is going to be installed at the end of the run.
Definition from the National Electrical Code Article 100:Feeder. All circuit conductors between the service equipment, the source of a separately derived system, or other power supply and the final branch-circuit overcurrent device.Branch Circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).
For service sizes of 100 amps and less a #8 bare copper conductor is required.
#6 bare copper wire.