> Your grounding configuration, using just the RF ground to your secondary
base and NST case
My NST case is *not* connected to RF ground, or indeed to any ground at
all. Iâ??m aware this makes the case potentially dangerous, but this is a
factor I can control. Iâ??n more concerned about blowing out my or my
neighbors electronics.
For proper TC operation to I need the NST case connected to a ground? I
would have concern that might cause RF frequency to feed back into the NST.
Thanks,
Joshua
On Sun, Nov 21, 2021 at 4:33 PM Gary Lau <glau1024@xxxxxxxxx> wrote:
> HI Joshua,
>
> Your grounding configuration, using just the RF ground to your secondary
> base and NST case, is correct. But I'm not sure it meets safety code, as
> should there be a power mains fault where your mains hot lead somehow
> shorted too your NST case, there would be no tripped breaker, and your NST
> case and entire coil would be at a lethal mains potential relative to mains
> ground. I don't think there is any way to resolve this, short of just
> considering EVERY part of a plugged-in coil to be at a lethal potential. I
> have my Variac case connected to mains ground, nothing else.
>
> Regards, Gary Lau
> MA, USA
>
> On Sun, Nov 21, 2021 at 2:48 PM Joshua Thomas <joshuafthomas@xxxxxxxxx>
> wrote:
>
> > One 'sanity' question for the list:
> >
> > My coil is using an RF ground only. The NST ground (ie, case) is not
> > connected to the mains ground; nothing is connected to the mains ground
> at
> > all. This is by design because I do not want any possible over-voltage to
> > feed back into the mains supply and possibly damage other equipment.
> >
> > The only two ground connections are 1) The bottom of the secondary coil
> to
> > RF ground and 2) The NST protection filter to RF ground. Both meet at a
> > common grounding point before the wire which leads to the actual earth
> > connection.
> >
> > Can I get someone to validate this setup is normal and not somehow going
> to
> > destroy my equipment?
> >
> > Thank you :)
> > Joshua Thomas
> >
> >
> >
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Joshua Thomas
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