Is anyone familiar with the testing method to check that 25 ohms or less are at the ground rods. Here on L.I., we have a single ground rod as a supplement to the main water pipe. Has anyone used a clamp on style meter to check grounds? Are the 3,4 type terminal testers better?
Thanks

I have used the clamp on with pretty good success. You have to clamp on at the last ground to the ground rod. The meter I use is made by AMEC and it will read 0.7 ohms if you have not connected on the last lead. The 3, 4 terminal testers are good but if you are just seeing if you are below 25 ohms, the clamp on is easier.

Jim

There is a ground-testing booklet at http://www.tradeport.on.ca/old_site/ApplicationNotes/aemc.pdf

Thank you for the pages on the Ground Test. It's an area that I would like to be more educated about. I appreciate both inputs.