*My you have a lot of questions. Quite frankly I don't know. The ground
testers that I have used were of the three point type and the clamp on type
and were battery operated.
Many years ago I was a foreman on a shopping center being built in Burbank,
Ca. The power company had very strict requirements for their transformer
pad. They wanted less than 25 ohms and the soil was sandy. We had already
installed two ground rods prior to the arrival of the tester from the power
company, but I had a few more handy with clamps. When the guy did his first
measurement he said it was no good. We drove a third rod and it was still
no good. After the fourth rod he said it was close enough.
Try doing a search on the internet for instructions on using the meggar.
Maybe try the manufacturer directly.
Incidentally the two rod requirement was in the 2005 code.
The two point, hand-cranked megger that I'm used to (ex-Navy) were used to
determine high resistivity, not low resistivity. That's why the question.
House was turned over to me by the builder on Feb 28th, 2005. Builder
started house in November, 2004.
I started the detached garage in late November, 2004. Finished in early
Which brings the question, if the most current NEC code is enforced by the
local municipality, is the start date or the finish date of the structure
that bears importance to meet local code? I know its unlikely in my case as
the municipality has to pass that most current NEC code into their current
code before the municipality's inspector can enforce it.
*In NJ we go by the code that was in effect at the time the permit was
issued. It would be too confusing and a big hassle to change codes during
the middle of a project. It could also affect the construction cost.
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