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A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.
2 copper
A #3 copper wire with an insulation rating of 75 or 90 degrees C is rated at 100 and 110 amps consecutively.
Depends on the size of the circuit which you did not list.