On 10/17/17 6:47 AM, Clay Autery wrote:
So, would I be correct in assuming in this case, that it would be
"better" to have the strap bond as close to the bottom/foundation as
reasonable to reduce the "parallel conductor" distance?
In my case, there are threaded steel rods in the foundation, not a tower
section... So the bond would be made to the tower leg that is
sitting/bolted in/to a steel clevis bolted to the threaded rod. I will
give additional attention to this inward force to which you refer in the
mechanical design.... perhaps a thicker strap and more craftsmanship in
the shaping thereof is in order. <wink>.
Why not just a lug on one of the bolts? Good clamping force, good
electrical connection, etc. If you've already bolted the base to the
rods, is there enough to put a lug and a second nut on top?
This brings up an interesting point, why is everybody talking about
making "clamps" of some sort to clamp onto a structure which has bolted
joints? I can see needing a clamp when you're grounding a long length
of hardline that you don't want to break for a connector. And I've seen
clamps on things like chain link fence posts (typically so that the gate
is bonded to the rest of the fence - the fence posts are set in concrete
in the soil, so they *are* a grounding electrode)
PS - Pretty stinkin' neat to learn something new.... Here's a link that
explains the math/theory at a reasonably understandable level. <smile>
http://www.kshitij-iitjee.com/Magnetic-force-between-two-parallel-conductors
Thanks Jim!
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
On 10/16/2017 11:11 PM, jimlux wrote:
Remember that parallel currents cause conductors to be forced
together. So your conductor that is bowed out and away, and basically
in parallel with the current carried through the base and concrete, is
going to be pulled in towards the tower to try and minimize the gap.
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