#6 Awg with #10 Ground
8 AWG copper.
#3 copper.
4 copper
6 AWG wire
A 200 amp service panel will require a # 4 bare copper ground wire.
AWG # 8 copper.
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
AWG #4 copper.
4 copper
#3 copper.
8 AWG copper.
6 AWG wire
2 copper
# 10 bare copper.
Use AWG #1 copper service entrance wire and #4 copper ground wire.
30 amp breaker with #10 gauge copper wire
AWG 2/0 copper wire.