Re: [TCML] Emi filter connection

[Jeff Miller <jeffmill2@xxxxxxxxxxx>]

You are correct. I see that now
I would like to leave the filter at the coil . I can remove the mains ground from the filter case then connect the rf ground to the filter case. I see that it is not as good as fig 3 but would that suffice ?

Sent from my iPad

On Mar 28, 2012, at 11:12 AM, Gary Lau <glau1024@xxxxxxxxx> wrote:

> Hi Jeff,
> 
> I put up a web page on my site about how to and how not to connect an EMI
> filter:   http://www.laushaus.com/tesla/emifilter.htm
> 
>> From your description, it sounds like you have your filter hooked up as in
> Figure 2 on my web page, except that you connect the mains ground to the
> EMI filter case.  This is bad, because C2 and C3 in the filter provide a
> low impedance path for common mode RF on the NST primary to get to the
> mains ground connected to the case.  What you want is Figure 3, so that you
> have an L-C low pass filter between the NST and everything that goes back
> to the wall.
> 
> Regards, Gary Lau
> MA, USA
> 
> On Tue, Mar 27, 2012 at 9:54 PM, Jeff Miller <jeffmill2@xxxxxxxxxxx> wrote:
> 
>> 
>> Hello
>> I am second guessing my emi filter connection.
>> my filter is located at the coil not at the variac. From my variac to my
>> coil I run 3 wires line, neu and gnd to the filter . the ground is
>> connected to the case of my filter and NOT to rf gnd which starts from the
>> case of the nts on out. it is a 15 amp round style filter I bought off of
>> eBay.  Is this ok? I am not running the filter in reverse.
>> Sent from my iPad_______________________________________________
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