300 kcmil @ 75°
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3/0 or250 aluminum
For Service Entrance Cable 600 kcmill (Thousands of circular mils).
A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.
Use AWG #1 copper service entrance wire and #4 copper ground wire.
For a 100 Amp breaker panel it would be 2 AWG. For 150 Amps it would require 2/0 (2 ought) aluminum wire.