I understand table 250-.122 may be confusing to read but it says
Rating or Setting of
Automatic Overcurrent
Device in Circuit Ahead
of Equipment, Conduit, etc.,
Not Exceeding
(Amperes)
20 12ga copper
60 10ga copper
I read that to say if you exceed 20a and do not exceed 60a you are in a #10.
Just as a sanity check, what size is the ground in a 10ga or 8 ga cable ... 10ga
