Re: NST Ground, RF ground, the whole bit...seperate issure

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "CJ Moore by way of Terry Fritz <twftesla-at-qwest-dot-net>" <wizard1234-at-home-dot-com>

I live in a pathetic suburb and can't go outside and drive a copper pipe 10
feet under the ground, I can barely operate a tesla coil in the confines of
my own garage. What should I do for my RF ground? Is it necessary? In
previous coils, I just taped a 2 gauge copper wire to the cement floor of my
garage and used that as a ground. Is this not enough?

CJ Moore
60871583


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, July 15, 2001 9:44 PM
Subject: Re: NST Ground, RF ground, the whole bit...


> Original poster: "Jon Tebbs by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jgtebbs-at-eos-dot-net>
>
> Hi Ralph, All,
>
> It seems that my choice of terminology has lead to a misunderstanding of
my
> post...
>
> Tesla list wrote:
> >
> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Parpp807-at-aol-dot-com>
> >
> > Jonathan and all,
> >
> snip
> > --------------------------------------------
> > In a message dated 7/14/01 10:58:31 AM Central Daylight Time,
> > tesla-at-pupman-dot-com writes:
> >
> > << <<<<All
> >  mains connected devices would best be grounded to the mains
ground.<<<<<<<
> >
> > IMHO the above sentence and the sentence below are contradictory.
> >
> > >>>>>Those
> >  devices that are intended handle RF should be connected to RF ground
along
> > with
> >  the secondary base i.e.: the NST Filter/Safety Gap, Strike Ring,
etc.<<<<<<<
> >
>  -------------------------------------------------------------------------
-----
>
> The _NST Filter/Safety Gap_ is NOT the RFI/EMI filter on the mains side of
the
> NST, it is that which is located on the HV side. Perhaps I should have
used the
> term NST Protection Filter. If by chance my reference to the _secondary
base_
> has been misconstrued to imply the NST case, it refers to the TC
secondary. My
> apologies for the less than optimal wording.
>
>  -------------------------------------------------------------------------
-----
>
> > I agree with the sentence below. I think Malcolm wrote it. The way I
read it,
> > Malcolm is telling us to simply keep 60 Hz, line powered devices away
from
> > any chance of being hit by RF. The ground from Terry's filter is NOT
> > connected to the
> > mains connected devices which are grounded thru the  AC power line.
> >
> >  >>>>>>Some will argue that if a mains connected device can be struck by
a
> >  streamer/leader/arc, then it should be connected to RF ground. This,
IMHO,
> >  would
> >  very unlikely _if_ attention is paid to detail in the design and layout
> >  stage to
> >  avoid the possibility in the first place. >><<<<<
> >
> > Yes, including the variac and blower motor.
> >
> --------------------------------------------------------------------------
----
>
> My reasoning for advocating the NST Protection Filter ground connection be
to
> the RF ground is based on the RF currents the Safety Gap and Filter R/C is
> called upon to handle. "I" do not want those transients returned to the
mains
> ground or even impressed upon the NST case.
>
> Again, consider the case of a missed "firing" where the primary capacitor
> charge
> exceeds the breakdown setting of the Safety Gap. The larger than normal
bang
> energy is dumped through the Safety Gap, with a portion through the
resistors
> and bypass capacitors. Even in normal operation, the protection filter is
> working to divert excess HF an VHF energy from reaching the NST, as Terry
has
> documented in his paper. "I" prefer to return these to ground by the path
of
> least inductance and away from the very device being protected.
>
> As we all tend to see things a little differently, I'd like to invite
Terry to
> comment on his reasoning, perhaps there is something that I am overlooking
> here.
>
> --
> Jon G. Tebbs
> <jgtebbs-at-eos-dot-net>
>
>
> > ---------------------------------------------
> > <<<<<<<<<<Malcolm, Jon, Jonathan,
> >
> > The NST case (or ground lug) connection should be
> >  wired to the AC ground prong.
> >
> >  Greg
> >  http://hot-streamer-dot-com/greg >>>>>>>>
> >
> > Greg,
> > Does the NST case (or ground lug) go to the AC ground prong when the
same
> > ground
> > in Terry's filter also goes to the RF ground as shown in the schematic?
> >
> --------------------------------------------------------------------------
----
> >
> > -------------------------------------------
> > In a message dated 7/15/01 6:43:23 PM Central Daylight Time,
tesla-at-pupman-dot-com
> > writes:
> >
> > << NST filter. well on terry's filter schematic, it shows the center
going to
> >  the NST ground, then to the RF ground. I think that's how I'll do it.
Now,
> >  what about the case of the RSG motor? should that me 60hZ, or RF
ground?
> > what
> >  about any metal used in the base of the pri. circ. (bolts...)
> >
> >  Jonathon<<<<<<
> > The motor frame may very well be grounded thru the green AC power line
> ground.
> >
> --------------------------------------------------------------------------
----
> >
> > -------------------------------------------
>
>
>