Different jurisdictions may have different requirements

Posted by John T on August 27, 2012 at 14:45:53 from (216.249.82.117):

In Reply to: ground rods (again) but different posted by ken combs on August 27, 2012 at 12:22:20:

YOUR QUESTION

Is this a regional thing??

ANSWER

Yes to some extent, it depends on which version, if any, the local authority, may or may not have adopted, or maybe they have their own code...Or heck maybe there are no requirements where you live and you can do as you see fit and as you consider safe, ground rods or no ground rods at electrical services????? Its your call not mine

That being said, heres information taken from

"Design, Selection and Installation of Electrical Wiring and Equipment" by LaVerne E. Stetson, P.E., Agricultural Engineer
USDA-ARS, Lincoln, NE

Grounding
A grounding electrode is required at every service entrance. Rods of 8 ft length (minimum) are commonly used, but the NEC (250-81) does allow other methods. Resistance from the grounding electrode to surrounding soil must be 25 ohms or less (NEC 250-84). If more than one rod must be used to get 25 ohms or less, additional rods should be spaced at least twice the length of the ground rods (e.g., two 8 ft rods should be at least 16 ft apart) and interconnected with a copper conductor and ground rod clamps approved for direct burial

When I was a secondary power distribution design enginner it wasnt so much if the rods were pure copper or copper clad etc. (I saw them 8 ft and 10 feet) IT WAS IF THEY TESTED TO BE 25 OHMS OR LESS if we drove one and it didnt pass then we drove another rod.

So again YES its a regional thing as different jurisdictions have different requirements BUT THE 25 OHMS SEEMS TO BE MORE IMPORTANT THEN IF THEY WERE PURE COPPER OR COPPER CLAD

NOTE proper Grounding of a buildings electrical service is essential to protect against lightning and surges and thats what the panel of experts that write the NEC say and based on my education and years of experience as a design engineer, I AM OF THE SAME OPINION and in good faith have to advise proper grounding electrode earth grounding at every buildings electrical service (subject ONLY to the single branch circuit exception and even if untrained unprofessional Billy Bob and Bubba think its not necessary lol).....

HOWEVER yall feel free to do it however you please even if in disagreement with what the NEC requires, its you and your familys lives at risk not mine.

Best wishes yall keep safe now

John T BSEE Purdue University 1969/1970

Replies:

• Re: Different jurisdictions may have different requirements Leroy 06:05:18 08/28/12 (0)
• Re: Different jurisdictions may have different requirements ken combs 22:17:44 08/27/12 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Advanced Posting Options Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Attach Serial # List  Return to Post

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]