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#8
July 10th 07, 11:14 PM
posted to rec.radio.amateur.antenna
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Question on grounding rods
"Jim Lux" wrote in message ... wrote: John Doe wrote: Isn't concrete an insulator?? "The preferred ground in most jurisdictions is a concrete encased grounding electrode (aka a Ufer Ground, after the inventor's name Herb Ufer).. " What am I missing here? That while dry concrete is a pretty good insulator it is hard to find such just about anywhere other than Southern Arizona. And even there, the concrete is probably damper and a better conductor than the surrounding soil. Ufer's original work was developing grounding techniques for ammo bunkers in desert areas, since the ground rods didn't work. I, too, am amazed - I though concrete, whilst it would be damp on the outside underground bit, would be substantially dry after setting, and a good insulator, being essentially sand.. I guess its porous or microporous.. Nick |
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