On 10/16/2017 6:18 PM, jimlux wrote:
On 10/16/17 3:44 PM, Clay Autery wrote:
Just off the cuff, I think this would be overkill for *lightning
protection*, which is why you don't see this approach in the usual
commercial radio installation handbooks (e.g. R56)
you don't worry so much about low resistance or contact area - if it's
reasonably close, the lightning current will arc from one to the other
and a high current spark is VERY low impedance.
And with a long strap, if it does arc underneath, you've got somewhere
for pressure to build up.
What *is* important is mechanical strength - as Jim K9YC pointed out,
Well... For me? When I have many thousands of dollars in equipment at
risk, there is no such thing as "overkill". :)
Anything I can do to pump as much of the strike into the ground prior to
entry into the shack, and thence to reduce the step potential, I will
do. :)
It doesn't take that much "extra" to do a job right.
Who said anything about a "long strap"? I was responding to the man's
question about the clamp...
But since you bring it up.... yes... a strap as wide as I can make
work, AND as short as possible and of sufficient mechanical strength to
stand up to the forces imparted. Apologize... I assumed that those were
givens. <big smile>
73,
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
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