It's likely better as far as permanent moisture goes. The ground rods are actually bottomed out at 16' below grade.
Where in the code does it say permanent moisture is a requirement for ground rods?
I would have to look it up, but just got through with Mike Holts bonding and grounding CE course, and it mentioned it as the reason ground rods are required to be 8’, and not driven exceeding 45 degrees.
Might be his explanation but I don't recall it is in the code.
No....they are 8' long. I drill a 1 1/4" hole in the concrete to allow for the acorn and drive the rod down so the entire length is in contact with the earth.
Explanatory material in the handbook is not official NFPA interpretations it is simply opinion of whoever authored it. Mike Holt's books, videos, live presentations are no different, any explanations he makes is his ideas/opinions and not any kind of official NFPA interpretation either. People that present such kinds of information often have a fair amount of credibility to back them up may even be able to quote CMP comments, reports, etc. to help back up some of what they say, still are not official representation of NFPA though.
Exactly. Just know I have seen it. Generally NFPA does not explain why they do anything! LOL!
That’s why I always buy the handbook.
PI's (public inputs) are not specifically mentioned in handbook. You need to go to NFPA website and look at the draft reports for a particular year, you will see all public inputs (formerly known as proposals) and the CMP decisions, with reasons if they rejected a PI. This is probably closest you get to NPFA interpretation without actually trying to request one, but for code language that been in existence for some time you have to find the right year when it changed to see the information on why it changed.
