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
>
>
>