[R-390] Grounds

[Glenn Little WB4UIV]

Braid is not good for lightning.
It provides a high impedance to ground for lightning.
Lightning prefers direct paths without and bends.
The braid is made of of a number of conductors with many bends.
This impedes the lightning which is a high frequency event.
Always use stranded or solid conductors to connect to a ground rod.
Recommended practice is number 2 minimum outside of the building and 
number 6 minimum within the building.
Compression fitting are not recommended for outside grounding use.
Preferred is cad welding.

Braid will provide a reasonable RF or safety ground.

73
Glenn
WB4UIV



At 01:07 PM 7/29/2009, mikea wrote:
>On Wed, Jul 29, 2009 at 09:32:50AM -0700, wli wrote:
> > >As long as we're on the subject of grounding........
> >
> > So I am asking, what is the opinion for those of us on the second
> > story in a wood house with a galvanized metal roof?
> >
> > I am thinking that you could use the entire roof as a counterpoise.
> > Then run a thick braid down to a earthing rod. At the moment, I have a
> > vertical lashed to the chimney, and a lightning arrestor attached to
> > my steel roof with a copper braid down to a grounding rod.
>
>I'm not in that position at the moment, thank goodness, but I'd think
>that the more copper straps or braids you could put down to ground rods,
>the better. All of them loop-and-bend-free, of course, to keep the
>inductance as low as possible.
>
>Do please let us know what your results are, as you continue in this
>investigation.
>
>--
>Mike Andrews, W5EGO
>mikea at mikea.ath.cx
>Tired old sysadmin
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