Original poster: John <guipenguin@xxxxxxxxx>
If I cant drive a grounding rod for RF ground, what is this counter
pose under the coil I hear people mention?
Thanks,
John.
On 10/9/06, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: Yurtle Turtle <<mailto:yurtle_t@xxxxxxxxx>yurtle_t@xxxxxxxxx>
Can you ensure no one will be using a sink in other
labs or in bathrooms? If not, I wouldn't do it.
--- Tesla list < <mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
> Original poster: "Gerry Reynolds"
> <<mailto:gerryreynolds@xxxxxxxxxxxxx>gerryreynolds@xxxxxxxxxxxxx>
>
> Hi John,
>
> This will work. Terry and I have done this with a
> 1KW coil spitten
> out 5 foot arcs. If inside, you need to be careful
> on what the
> streamers hit. Best not to hit anything other than a
> strike target
> that is directly gounded to the system RF ground
> close to the base of
> the coil. Some may also recommend a counterpoise
> under your coil
> that is connected to RF ground. I presume you are
> on the first floor
> and this copper pipe is readily available. You may
> also want to get
> the electrical stuff in the science room shut down
> for the demo. A
> lot depends on what the surroundings are (above and
> below the coil,
> and in the walls surrounding the coil. Keep as much
> clearance from
> the walls and ceiling as possible. Dont let arcs
> hit the walls or
> ceiling as this may hit internal wiring or cause a
> fire. If this is
> a perminent installation, much care is needed for
> safety. If only a
> one time demo, the area needs to be supervised to
> keep unauthorized
> people at a safe distance and out of the equipment.
> You be the judge.
>
> Gerry R.
>
> >Original poster:
John > ><<mailto:guipenguin@xxxxxxxxx>guipenguin@xxxxxxxxx>
> >
> >Thank you.
> >
> >If I am going to have my coil running in a science
> room.... could I
> >use the metal sink pipe as RF ground?
> >
> >On 10/7/06, Tesla list <<mailto: tesla@xxxxxxxxxx>
> <mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
> >Original poster: "Gerry Reynolds"
> ><<mailto: gerryreynolds@xxxxxxxxxxxxx>
> <mailto:gerryreynolds@xxxxxxxxxxxxx>gerryreynolds@xxxxxxxxxxxxx>
> >
> >Hi John,
> >
> >If you are operating outside and the NST is under
> the primary (or
> >very close to it), I would ground the NST to RF
> ground (a copper rod
> >staked in the ground). The strike ring will be
> tied to the base of
> >the secondary. The base of the secondary will be
> connected to RF
> >ground. Safety of the NST chassis during operation
> is not as much an
> >issue if located there as no one should be close to
> the NST while
> >operating. Any secondary strike to the strike ring
> will return
> >directly to the base of the coil. Any stike to the
> primary will arc
> >to the safety gap and go to the NST chassis and
> then return to the
> >base of the coil via RF ground. Any overvoltage of
> the primary
> >circuit will also be shunted via the safety gap to
> the NST chassis
> >where it wants to go. This grounding will help
> keep voltage
> >transients off of the mains ground and out of the
> house where it can
> >do damage to equipment. The mains ground can be
> used to ground the
> >variac and line filter, but should stop there and
> not go the the NST.
> >
> >BTW, grounding the center terminal of the safety
> gap directly to the
> >NST chassis is correct as it is intended to protect
> the NST.
> >
> >Gerry R.
> >
> > >Original poster: John
> <<mailto:guipenguin@xxxxxxxxx>
> ><mailto:guipenguin@xxxxxxxxx>guipenguin@xxxxxxxxx>
> > >
> > >I think I am going to build this simple NST
> protection filter for my
> > >new coil.
> >
>
><<<http://hot-streamer.com/greg/filter.htm>http://hot-streamer.com/
greg/filter.htm >http://hot-streamer.com/g
>
> > reg/filter.htm
> ><http://hot-streamer.com/greg/filter.htm>http://hot-streamer.com/g
reg/filter.htm
> > >
> > >I see the center safety spark gap is grounded to
> the NST's chasse,
> > >which is grounded to mains ground.
> > >
> > >Now, am I correct in thinking that I should NOT
> ground the primary
> > >circuit to the same ground as the end of the
> secondary (as I see in
> > >many schematics) as this could pose a threat from
> putting you in
> > >contact with the primary circuit through a
> secondary spark?
> > >for a spark gap Tesla coil, is this circuit that
> I linked the only
> > >thing that should be ground to mains ground?
> and then ONLY have
> > >the end of the secondary coil to a separate RF
> ground?
> > >
> > >I want to make sure I have everything as safe as
> possible before I
> > >even start building my design.
> > >
> > >
> > >
> > >Thanks again,
> > >
> > > John.
> > >
> > >
> >