ECN Forum Forums General Topics of the Trade General Discussion Area Gnd. rod resistance tester

Can anyone explain how these clamp-on testers work for measuring Ground rod resistance?

As far as the clamp ons go Bill, we have recently challenged their validity. Wasn't my fight, but am in the middle of the outcome. I can report what we find, but it will be awhile.

There is some condensed material at http://www.tradeport.on.ca/ApplicationNotes/aemc.pdf

The three-point or "fall-of-potential" method is probably the most commonly used.

Clip-on testers are described on pg.22 They seem to be most suited for testing single rods that are part of a multi-rod grid.

George,

What I meant was how they 'do what they do'.

BJ,

That looks like an interesting paper. I printed it out and will surely read it at first opportunity. Thanks!


Bill