On 05/01/2017 00:14, Dean Hoffman wrote:
I guess one doesn't test earth grounding with a regular ohm meter.
The instructor at one of my code refresher classes asked once if
anyone had
the correct type of tester. No one did out of at least 50
electricians. Earth grounding
is primarily for damage from lightning. He also had a diagram showing
how little current would flow through the earth if a well motor had a
short to the frame. The resistance was so high that there was no way
even a tiny fuse would blow if there was a short.
This is from the meter maker Fluke:
http://support.fluke.com/find-sales/Download/Asset/2633834_6115_ENG_A_W.PDF

I like that link.

Page 5 has a table with ground electrode depths ranging between 3 and
1000 meters.

Yes, meters. I'll assume they mean metres, which is well over half a
mile... maybe they do mean a pile of 1000 testers?

Hmm... I wonder what they do mean?

Page 6 says "Just watch your units"

Andy