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Re: Steel structure - appropriate ground?
Subject: Re: Steel structure - appropriate ground?
Date: Sat, 3 May 1997 13:35:35 +0500
From: Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
On Thu, 1 May 1997 22:37:19 -0500 Robert W. Stephens
<rwstephens-at-headwaters-dot-com> wrote;
> Alfred,
>
> I have to dissagree with you here. The third prong ground in a wall
> outlet does indeed terminate in a fairly good ground, but only after
> travelling considerable distance in parallel with the ac mains
> conductors. It is quite inductive and at Tesla coil frequencies can
> become quite a RFI radiation source. The drop along the length of
> the oulet ground wire will be impressed on the AC mains, causing
> mayhem to computers and the like everywhere in the building.
In residential wiring I would agree, but industrial wiring is all
done in metal conduit which is also bonded to ground so it would act
like a shielded cable and R.F. would not be capable of radiating from
the wires.
> In some smaller coil applications you'd actually be better off not
> using the ac ground and using a large metal counterpoise (large metal
> desk, cluster of filing cabinets wired together, etc.?) in the vicinity
> of the TC instead.
This is fine if all you are looking at is the return ground for the
R.F. but unless you use an isolation transformer, without a ground
you are inviting severe electrical shock and possible electrocoution.
Sincerely
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Alfred A. Skrocki
alfred.skrocki-at-cybernetworking-dot-com
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