At the service entrance you will need AWG 1/0 gauge.
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3/0 gauge
6 AWG will handle 50 amps with a voltage drop of about 4 volts. If you go to 4 AWG and limit to 50 amps your voltage drop will be 2.5 volts.
140 AMPS
AWG # 14 is the smallest wire you can install in a home and it can only be used in living areas. It will carry 15 amps.
AWG # 10.