Grounding Electrode

[Tebow]

A residential service uses a 1/0 THW aluminum conductors. The minimum size aluminum grounding electrode conductor for this installation would be a? Section 250.66 says a #6, but the answer that was given is a #4??

 

[Dennis Alwon]

I'll take a stab at that. The book is wrong. :happyyes:

 

[Little Bill]

A residential service uses a 1/0 THW aluminum conductors. The minimum size aluminum grounding electrode conductor for this installation would be a? Section 250.66 says a #6, but the answer that was given is a #4??

I'll take a stab at that. The book is wrong. :happyyes:

I think you missed with your stab. You need a #4 for aluminum conductors, #6 is for copper.

 

[Smart $]

I think you missed with your stab. You need a #4 for aluminum conductors, #6 is for copper.

Question spec's aluminum for both SE and GEC. 1/0 and smaller AL SE requires at least #6 AL GEC.

 

[Ponchik]

Question spec's aluminum for both SE and GEC. 1/0 and smaller AL SE requires at least #6 AL GEC.

I agree.

 

[Little Bill]

Question spec's aluminum for both SE and GEC. 1/0 and smaller AL SE requires at least #6 AL GEC.

Do you have to be so Smart mister $? I was looking at copper SE with AL GEC.:slaphead:
I shouldn't try to post so late.:happyno:

 

[gndrod]

A residential service uses a 1/0 THW aluminum conductors. The minimum size aluminum grounding electrode conductor for this installation would be a? Section 250.66 says a #6, but the answer that was given is a #4??

Wait a minute. Dennis might be correct. The question is unanswerable since the grounding electrode is not defined??

 

[Sierrasparky]

I might agree as we don't know if it's copper or Al. I use AL all the time for the Service but never use Al for the GEC.

 

[Smart $]

Wait a minute. Dennis might be correct. The question is unanswerable since the grounding electrode is not defined??

I might agree as we don't know if it's copper or Al. I use AL all the time for the Service but never use Al for the GEC.

With a 1/0 AL SE, do you know of any instance in which you can use an AL GEC smaller than #6...??? :happysad::happysad::happysad:

 

[gndrod]

With a 1/0 AL SE, do you know of any instance in which you can use an AL GEC smaller than #6...??? :happysad::happysad::happysad:

Good point. Let alone a #6 AL in new dwelling construction.

 

[Dennis Alwon]

Wait a minute. Dennis might be correct. The question is unanswerable since the grounding electrode is not defined??

I didn't say unanswerable I said the book was wrong because #4 is not the correct answer. I believe my answer is correct.

 

[gndrod]

I didn't say unanswerable I said the book was wrong because #4 is not the correct answer. I believe my answer is correct.

I now agree, regardless of SE being mentioned, I see what you are saying. The 1/0 AL being used for the residential service would be for 125 A, accordingly the GEC could be #6 AL per 250.66.