Well, now lets go to the ‘spec’, tediously written, and most times drawn within the plans. Some spec a 8’ rod, cadwelded to #6 or 4 cu, up into the pole base. Some spec a 10’ rod, or some spec 20’ min., #x rebar, with #4 Cu.
Thinking back, one that jumps to mind is site lighting for a new bank. Spec was 10’ rod, cadweld, #4 Cu. No sweat, yje EC did his thing & insp was OK. Poles arrive, I just was driving by, ‘sparky’ had the pole on his shoulder, all 15’ of it. Turns out the poles is the fixture schedule were FIBERGLASS!!! Duh,