I dont know what else to say but this , all the water pipes here on residential for the past 30 years or more are pvc or pex pipe ,
Then there is no water pipe electrode present.
if you find an old house or new building with metal it connot be used as the grounding electrode because the water lines from the main to the meter are all flex plastic now installed by the water company.
And once again if there is not 10 feet of metallic water pipe in contact with the earth there is no water pipe electrode.
We are allowed to use 2 rods as the only means of ground without an ohm test,
As is everywhere under the NEC rules.
but we are required to bond metal piping .
As is everywhere under NEC rules
To the rods we are required to use chart 250.66 for the GEC and for 4/0 alum the size is #4 cu.
Is that in a formal GA code that someone could access online?
We are not allowed to reduce the GEC to #6 by 250.66 A.
It would not be
reducing the required GEC size.
It is that way for every county around here.
Can they provide you with a formal set of their codes?
The only exception is if you do the ground test on metal pipe and it passes for the main ground then #4 is ran to the pipes and #6 to 1 rod is allowed.
Once again, can they provide you with a formal set of their codes?
I am not going to start an argument with 7 counties that I only have to use #6 to the rods on a 200 amp with plastic pipes .
That is your perogative but this discussion is in the NEC forum.
These rods are the main electrode ground when there is no metal pipe .
And unless one of the other electrodes listed in 250.50 is present this would be true per the NEC but, there is no reason for these rods to have a larger conductor than a #6. Just for fun, ask your inspector(s) how much current will flow in a 120 volt circuit with 25 ohms?
Roger