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6 AWG wire
AWG # 6 copper or AWG # 4 aluminum
#10 refers to the size in AWG (american wire gauge)
Use only AWG # 10 copper.
8 AWG copper.
6 AWG wire
AWG # 8 copper
AWG # 8 copper.
AWG # 6 copper or AWG # 4 aluminum
#10 refers to the size in AWG (american wire gauge)
AWG #4 copper.
Use only AWG # 10 copper.
A 100 amp service requires that you use AWG 4 copper wire or AWG 2 aluminum wire.
Service wire required is AWG # 3/0 copper.
8 AWG copper.
I think you mean either what is the correct size or minimum wire size needed when a branch circuit is protected by a 20 A breaker. The size is 12 American Wire gauge (AWG). 14 AWG is used for 15 A circuit and 10 AWG for a 30 A breaker. The lower the gauge the larger the cross-section of the wire.
Service entrance wire should be AWG #3 copper.