What size ground wire is required for 80 amp service?

Answer 1

Ground is sized based on the size of the feeder wire and not the amps of the service!

However, for a 600 amp service 1500MCM copper wire is one option (NEC 310.16) ;therefor, ground wire is 3/O copper (NEC 250.66)

or

another option is a two sets of 350 MCM copper wire then a #2 copper (since the biggest feeder wire is 350MCM).

Answer 2

A #6 copper wire with an insulation factor of 75 or 90 degrees C are both rated at 65 amps.

Answer 3

#6 gauge copper

Answer 4

#8 copper wire.

Answer 5

#8