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Re: EMI Filter Hookup? -- Internal House Wiring Popping And Crackling
On 11 Mar 00, at 10:52, Tesla List wrote:
> Original Poster: "Ruud de Graaf" <rdegraaf-at-daxis.nl>
>
> >Original Poster: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net>
> >
> >Hi J.B,
> >
> >> Original Poster: "J. B. Weazle McCreath" <weazle-at-hurontel.on.ca>
> >> The big thing is grounding the filter. I connect the ground terminal
> >> to my main R.F. ground which is also the ground for the bottom end of
> >> the secondary, the "protection network" ground, and the strike rail.
> >> You'll likely have no problems if you go this route.
> >
> >Hmm, I think I will disagree, here. Remember you are nailing
> >quite a few amps through the secondary ground. You have
> >a length of wire (=resistance), which means voltage spikes
> >appear on the RF ground line. This isnīt something you
> >really want floating through your house ground OR on the
> >zero potential terminal on your RF filter. If you *hit* the right
> >frequency, these spikes might even induce voltage upon your
> >phase or neutral line. I would ALWAYS ground the RF filter
> >on the mains ground and not on the RF ground. If your filter
> >dies (shorts) you will be superimposing RF, HV on your mains,
> >which isnīt exactly what you would like to do. Plus you might
> >provide a direct path for 50/60 Hz mains voltage to the HV
> >part of your coil setup. This can wreck all sorts of havoc.
> >
> >I think everything from the HV side of the xformer on *upwards*
> >should be connected to the RF ground and everything *below*
> >that to the mains (normal) house ground.
> >
> >Coiler greets from Germany,
> >Reinhard
> >
> I couldn't agree more Reinhard, I had the same feeling about that remark,
> but I had trouble that time to find the right motivations. As I wrote
> earlier, I have the feeling that some members of this list have no idea how
> great an impact inducing currents can have. I have read somewhere about 2
> years ago, that somebody had a Tesla coil on a table top with a metal side
> on it, what eventually got the table on fire because of the sparking on the
> not connected ends of metal strip!
> I would also advice to use a shielded power cord between the EMI filter and
> the power outlet for the same reason.
>
> Ruud
> Greetings from lovely and sunny Holland
FWIW I always connect the line filter to the mains ground - also the
NST cas/es. The only thing connected to my RF ground is the
secondary coil and any discharge points.
Regards,
Malcolm