Please use the correct tool not a ohm meter but a merger.
Paul
W3PLP
Sent from my iPhone 6 plus
> On Jan 21, 2015, at 8:29 AM, Patrick Greenlee <patrick_g@windstream.net>
> 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.
>
> It would seem that if I take an ohm meter reading between the unconnected
> leg's mount and one of the other mounts I will be getting a valid estimate of
> the Ufer ground quality of my tower installation's foundations. It could be
> argued that I am actually measuring two Ufer grounds in parallel as two of
> the attachment points are bridged together by the tower. I suppose I will
> also unbolt one of the hinged legs so I can measure independently from the
> non hinged leg mount to each hinged mount in turn.
>
> There is plenty of rebar in the foundations. The rebar cages are welded with
> allowances for the effect of welding on rebar (welded at ends and overlaps so
> no structural degradation.) Each leg's foundation has three each pier holes
> augered with a 12 inch tractor mounted auger. I moved the tractor a little
> while augering to get a larger hole. There is rebar in each pier hole and a
> rectangular cage connecting the three holes. All rebar is welded so there is
> good conductivity throughout the rebar armatures.
>
> Each set of three pier holes is topped by a 2'x2'x7' horizontal concrete beam
> with an extensive rebar cage that is well connected by welding to the rebar
> in the augered holes. All rebar is at least 2 inches (typically 3) from the
> dirt/concrete interface.
>
> 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?
>
> 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?
>
> Just write your opinion on the back of a US $20 bank note and mail to my QSL
> address in QRZ.com including a SASE if you want a receipt and or thank you
> note.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|