Re: coax (grounding shield & AC?)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "resonance" <resonance@xxxxxxxxxxxx>



It depends on each setup, but with a pole xmfr I've seen it form 
standing waves and potential rise high enough to shower the entire 
bushing with over 125 kV sparks!  If you do this, always run a safety 
gap from xmfr bushing to ground so if if starts firing you can stop 
it before it damages your xmfr. I never use coax with a pole xmfr 
after seeing this wild display of fireworks!!  We were running a .06 
uF tank cap when this occured.

Dr. Resonance



> "Don't run it with AC with the grounded shield on it."
>
> Hi, just wondering why it is not good to use the coax with grounded 
> shield on for AC? I use coax for high voltage wire on my jacobs 
> ladder. I did notice that if the grounding shield was left normal by 
> the high voltage terminals of the NST it would pick up some of the 
> electricity. A small, weak, arc on the other end of the shield would 
> jump to anything conductive, such as your hand. Cutting the 
> shield/coil of wire off about 1" from the terminals stopped the 
> problem though. Is this the reason, or something else?
> Thanks,
> Matt G.
>
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> ---------[ Received Mail Content ]----------
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> Subject : Re: RG-8 coax
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> Date : Thu, 03 May 2007 01:18:55 -0600
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> From : "Tesla list" <tesla@xxxxxxxxxx>
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> To : tesla@xxxxxxxxxx
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> Original poster: "resonance"
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> With DC it will handle approx 50 kV just as it is.
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> With 60 Hz AC strip the outer coax off and run a separate ground
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> cable, eg, 12 AWG. Don't run it with AC with the grounded shield on it.
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> Dr. Resonance
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> >I know many of you use RG-8 for HV wire...
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> >Is it absolutely essential to strip the whole length or can I get away >with
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> >leaving it as it is.
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> >If I must, what is the most efficient way to do this?
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> >Any response is always appreciated!
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> >Robert Hanford
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