[TCML] Main ground vs RF ground
imugjug at gmail.com
Wed Nov 25 18:02:06 MST 2009
Thank you for the advice. I will connect the RF ground to the copper plated
rod imbedded 3 feet into the soil, using 12 gage insulated house wire. The
strike ring will also have the same ground.
On Sun, Nov 22, 2009 at 4:21 PM, BunnyKiller <bunnikillr at cox.net> wrote:
> Hey Raymond...
> The RF ( radio frequency) ground is "normally" connected to the base of the
> secondary coil and is preferably kept "unconnected" from the house supply
> ground ( the green wire in the fuse/circuitbreaker box). Strike rails are
> also connected to the RF ground rod too....
> the green wire ( ground) in the house circuit is to transfer 60 Hz live
> (hot 120Vac) from the device that could be shorted to case etc. in such a
> manner to cause the circuit breaker to trip or to blow the fuse instead of
> having the current pass thru whomever may end up touching the shorted item.
> Most homes where I live, the ground and neutral are one and the same.
> The RF ground for a coil carries the operating frequency of the secondary
> coil to ground. This difference in frequency ( 60 Hz vs. 200Khz+) needs to
> be separate from the homes system, thus the desirable need for a separate
> ground rod. There have been cases when coils have been attached to the
> house ground instead of its own RF system with results that can range from
> odd glitches in home electronics to full blown failures of circuitry boards
> in appliances in the home and even in some rare instances, neighbors homes
> were involved ( apartment complex).
> If your NST is under the coil, it would best to have the case on the RF
> ground, just in case a streamer decides to reach around and hit the NST
> Scot D
> Raymond Magdziarz wrote:
> I have been reading all about grounds but nobody defines RF ground. On my
>> coil I have the NST case connected to the green wire of my line cord. The
>> low side of the RF coilis connected a wire ring intended to protect the
>> primary from the top of the secondary. I find that the low side of the
>> secondary is as hot as the high side. I was using an insulated building
>> to draw arcs from the top of my coil, and I noticed corona drawn to my
>> through the insulation. I have driven a copper plated 1/2 inch diameter
>> three feet into the soil near my house saturate the location with water
>> intend to connect the low side of the secondary to it. I will call it
>> ground. I welcome any comments.
>> On Sat, Nov 21, 2009 at 9:19 AM, Dex Dexter <dexterlabs at dcemail.com>
>>> I don't know Father Dest (who's that?)
>>> This is a very old practice of RF grounding.
>>> I think Tesla used to do it first :-)
>>> --- bartb at classictesla.com wrote:
>>> From: bartb <bartb at classictesla.com>
>>> To: Tesla Coil Mailing List <tesla at pupman.com>
>>> Subject: Re: [TCML] Main ground vs RF ground
>>> Date: Fri, 20 Nov 2009 19:48:47 -0800
>>> Hey Dex, curious if you know Father Dest? Sounds like something he would
>>> have done.
>>> Bart B. Anderson
>>> Dex Dexter wrote:
>>>> I have touched the case of my 5kV at 20mA NST many times
>>>> during Tesla coil operation.It doesn't hurt at all.
>>>> My NST case is mains-grounded,and Tesla coil is grounded
>>>> to water pipe in my house :-)
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