On 9/28/13 11:56 AM, Roger (K8RI) on TT wrote:
On 9/28/2013 1:27 PM, Hans Hammarquist wrote:
The idea is not to let any current through the aluminum foil. ALL
connections to the foil is in ONE point, the point there everything is
entering the shack. I do not believe tht the foil would protect the
shack from a direct lightning strike. What is the possibility that
will happened anyhow with a 85 foot tower next to it. OK, never say
never!
This is where the Single Point Ground (SPG) is important and that every
lead coming into the shack is protected. Power, if multiple circuits
needs to follow the sane routes for their entire lengths. Use a
relatively large, grounded, "bulkhead" through which all leads must
pass. Grounding and bypassing all leads is to insure the induced
voltage from nearby strikes causes the voltage on all lines to rise at
the same rate and to the same potential. Your common grounding sounds
good.
One should abolish the term single point "GROUND", because it isn't
ground. "common voltage reference point" would be a better term.
But the description here of everything (power, phone, data, coax) coming
in tied to a common point is sound. It doesn't physically have to be
through some sort of bulkhead. But it does need a low resistance,
reasonably short connection.
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