On 1/21/15 5:29 AM, Patrick Greenlee wrote:
I have a triangular tower with legs on 14 ft centers, yes, 14 feet, not
inches. I built it with three separate concrete foundations, one per
leg. It is currently tilted over so one leg is not touching its
concrete embedded mechanical connection/mount.
Am I missing something? Will a simple ohm meter test give a reasonable
measure of Ufer ground quality, sufficient to decide the question of
whether or not multiple copper clad ground rods need to be installed and
interconnected?
You need to use an AC source for the measurement: a DC source will cause
polarization and the reading will be low resistance at first and then
rise (think as if it were an electrolytic capacitor). The other thing is
that a typical solid state multimeter uses such low current/voltage that
you're going to see strange readings.
if you have something like a 12-24V AC transformer around (12.6V
filament transformer, landscape lighting, bell transformer), you can use
it: measure voltage and current, and you can go from there. You can
even use 110V (with an isolation transformer from the line, please!)
Is it too much of a leap of faith or otherwise to assume the inter-leg
resistance is an adequate predictor of tower mount to Mother Earth
conductivity?
Nope.. that's pretty much how they do it.
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