Re: Grounding (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 11 Aug 2007 15:17:35 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Grounding (fwd)

Hi Chris,

What seems to kill NST's are voltages greater than the internal hv 
windings can handle. Most NST deaths show a burned out shorted turn or 
two on the outer layers nowhere near the core. Now, if an NST drew too 
much current, a primary connection can suffer as I found out recently 
(not a common problem). I personally ground the NST to RF ground simply 
to keep the spikes off of mains ground. If your going to connect the 
case to mains ground, a filter is a good idea.

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Fri, 10 Aug 2007 23:22:31 -0400
>From: Crispy <crispy@xxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Grounding (fwd)
>
>On an NST, should the center tap usually be grounded to the mains ground
>or the RF ground?  Would the high frequency in the RF ground contribute
>to damaging the NST?  If so, could the NST's center tap ground be
>filtered before connecting to the main RF ground?
>
>Thanks,
>Chris
>
>On Fri, 2007-08-10 at 11:18 -0600, Tesla list wrote:
>  
>
>>---------- Forwarded message ----------
>>Date: Fri, 10 Aug 2007 12:53:49 EDT
>>From: Mddeming@xxxxxxx
>>To: tesla@xxxxxxxxxx
>>Subject: Re: Grounding (fwd)
>>
>> 
>>In a message dated 8/10/07 10:27:35 A.M. Eastern Daylight Time,  
>>tesla@xxxxxxxxxx writes:
>>
>>
>>---------- Forwarded message ----------
>>Date: Thu, 9 Aug 2007  21:23:33 -0700
>>From: Anthony R. Mollner  <penny831@xxxxxxxxxxxxx>
>>To: Tesla list  <tesla@xxxxxxxxxx>
>>Subject: Grounding
>>
>>I've heard a few things  about grounding and I was hoping to get some real
>>insight on this. Ok, the  secondary deserves a really good ground connection
>>but what about the power  supply and the tank circuit? Not to mention any
>>other line or transformer  circuits that might be included? Should all
>>grounds be independent? Should  they all be attached to the same ground rod?
>>How about multiple grounding  connections like water pipes and ground rods?
>>Should the ground connection  at the panel be used as well or separately from
>>the rest of the circuit? My  experience has been that the more the better,
>>tied together or  not.
>>
>>Tony
>>
>>
>>
>>Hi Tony, 
>> 
>>A common rule of thumb is to keep all the RF-carrying stuff grounded  in one 
>>place and all the 50/60 Hz-only stuff grounded separately. My method is  to 
>>ground everything from the control box back to the wall to the  (well-filtered) 
>>AC mains ground and everything forward of the control box to the  separate RF 
>>ground. If you Google the terms "ground loop" and "mains grounding  currents" 
>>you should get 250,000+ hits. While most talk about hum in low voltage  audio 
>>circuits, the same principle applies to the 10-20 KV in the Tesla primary  and 
>>the 200+ KV secondary, where you'll get much more than a "tingle" from a  
>>microphone, or a hum in your speakers. =:^O.
>> 
>>Matt D.
>>
>>
>>
>>************************************** Get a sneak peek of the all-new AOL at 
>>http://discover.aol.com/memed/aolcom30tour
>>
>>
>>    
>>
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