250.122(B) requires EGCs to be increased proportionally when circuit conductors are increased for voltage drop.
So, although a #10 EGC is good enough for up to a 60 amp ckt., per Table 250.122, if you run a particularly long, 20-amp ckt. and increase the ungrounded conductors to, say #8, you will need to increase the EGC to #8 also.
Any comments, please?
