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Re: hv connections
All,
I agree with Terry that you cannot necessarily trust the shield of a
coaxial cable employed for HV power to contain a "spill". I had an RG-9
cable blow an emergency location flare once on its way from a pole pig to
the Tesla coil it was powering. I've got it on tape somewhere. This was
the result of a standing wave, but the point is, the double shields weren't
enough to stop what looked like a Roman Candle on the fourth of July from
ejecting out of this nice piece of heavily armored double silvered-copper
braid shielded cable at just 10 kVA!
I don't trust any system on faith anymore. Engineer to the best of your
resources...then stand far+ away before you first turn the switch.
Robert W. Stephens
Director
AREA31 Research Facility
www.area31-dot-org
----- Original Message -----
From: Tesla List
To: tesla-at-pupman-dot-com
Sent: Saturday, March 04, 2000 15:47
Subject: Re: hv connections
Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
At 07:14 PM 03/04/2000 +0000, you wrote:
snip...
>>
>>Either you believe the ratings or you don't. At some point you've got to
>>believe in your design. Of course, this is why I like coax with the shield
>>grounded. even if the insulation breaks down, its going to spark to
>>ground, not my hand.
>>
>
>Good idea :) Is it safe and reliable?
>
snip...
Last week I watched a two foot section of RG-393 dramatically explode when
the inner conductor and dual silver plated outer shield arced due to a
defect in the cable (someone wanted to "test" it...) Although are TCs are
far less powerful than our little toy at work, coaxial cable may still make
a good bang if a primary cap were to blow it through. Best not to hold
such high power things in ones hand... ;-))
Cheers,
Terry "ears still a ringin'" Fritz