thanks , but why do you typically size a number 4 awg cu for a 200 amp single phase service if you can use the exception.
So if the other electrode in combo with the ground rod is a cold water pipe, this exception does not apply?
So if the other electrode in combo with the ground rod is a cold water pipe, this exception does not apply?
Oops!... 4 AWG needs protection from damage while 4 AWG ... does not.
Has anyone ever heard that stranded wire is not allowed to the ground rod? I have never used stranded but I heard that people are cited for this because stranded is not resistant to corrosive conditions. So what is a corrosive condition-- underground????
That's what I thought but they are turning it down based on the strands corrode under soil conditions--- the corrosion gets in between strands.I have never used anything but stranded. It's code compliant to use either.
... that 6 AWG needs protection from damage
while 4 AWG or larger does not.
250.62 Grounding Electrode Conductor Material.
The grounding electrode conductor shall be of copper, aluminum, or copper-clad aluminum. The material selected shall be resistant to any corrosive condition existing at the installation or shall be suitably protected against corrosion. The conductor shall be solid or stranded, insulated, covered, or bare.
Here is what they are citing.
To me that sounds bogus unless they can provide some empirical data stating otherwise. I would go out on a limb and say that the copper will last longer than the ground rod even if it's stranded.
Funny; I've only used solid.I have never used anything but stranded.
I've always read that copper oxide is conductive.I have seen stranded with corrosion between the strands when outdoors.
Can I dream? :grin:-- what would happen to all those engineers that spec 3/0 to the ground rod?
I've always read that copper oxide is conductive.
Can I dream? :grin: