"BobK207" wrote in message
oups.com...


If a small diameter ground rod (1/2" or 5/8") doesn't give the 25 ohms
(or less) to ground.....would a larger (3/4" or 1") diameter rod in the
same soil do better?

Is the soil the culprit or the soil / rod contact resistance? The
larger diameter rod contacts more soil..better grounding behavior?

cheers
Bob


The diameter of a rod has very little to do with the resistance of the
ground. The length will have a large effect. Ground rods should be
atleast 6 feet apart. Much closer and there is enough coupling through the
ground that the second rod does not reduce the resistance by very much.