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Rule 97 NESC

Merry Christmas
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ruth

Member
Charlie, you were curious as to the outcome of my previous question, subject as above. Below is a portion of the response I got from Mr. Clapp. Thank-you for the info. This is a great web site.

"I understand that your system is a single-grounded system, not a multigrounded-wye system. If so, your grounding scheme is correct. The Corps has adopted the National Electrical Safety Code. Under NESC Rule 097, you cannot connect the primary grounding wire or electrode to the secondary grounding wire or electrode unless you have an effectively grounded neutral that is grounded not less than 4 grounds per mile. Since you do not have that, Rule 97A requires separate grounding conductors to separate ground electrodes, which is what you are doing. The Code has traditionally required not less than 20 ft between these two electrodes to limit the opportunity for a high-voltage problem to be transmitted through the earth to the secondary system. See also Rule 97D1. There is a lengthy discussion of these issues in the NESC Handbook and a Grounding Primer in the Practical Utility Safety book (both are available from utilitybookstore.com)."
 

charlie

Senior Member
Location
Indianapolis
Re: Rule 97 NESC

Great, I am very happy things have worked out so well and your system isn't broken. I wish you the best.

By the way, if we ever meet, you owe me a cup of coffee :D .
 
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