Hi,
I have two 100A service panels. Panel 1 has a #6 copper wire running from it to a water pipe and believe it is the correct size based on the NEC 250.122 because, the largest service wire is 200A at the meter to power the panels. Panel 2 doesn't have a ground so, can I connect a #8 wire (that I see listed as 100A under the NEC 250.122) from that panel to panel 1's grounding bus bar? or to panel 1's #6 wire?
Thank You.