Grounding electrode conductor

[Davebones]

What size grounding electrode conductor on a parallel feed of 3/0 's from transformer to panel.480 V to 120/208V

 

[charlie b]

Would you mind telling us what you think, and why?

 

[Lcdrwalker]

Two 3/0's would be approx. equal to 400mcm. The GEC for 350-600 mcm copper is a 1/0. T250.66

 

[roger]

Two 3/0's would be approx. equal to 400mcm. The GEC for 350-600 mcm copper is a 1/0. T250.66

Did you happen to see Charlie's reply?

Roger

 

[barbeer]

Is this one of those trick questions?

 

[LarryFine]

Is this one of those trick questions?

Is that?

 

[tryinghard]

What size grounding electrode conductor on a parallel feed of 3/0 's from transformer to panel.480 V to 120/208V

What type of electrode are you using (250.66)?

 

[Davebones]

Building steel

 

[Dennis Alwon]

Building steel

Usually it is speced but you have already been given the answer in post #2