RE: HV xray cable revisited

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Carl Litton" <Carl_Litton@xxxxxxxxxx>

Mike,

If you are experiencing arcing, then you are in fact losing power.
Something may wrong with the preparation of the cable or the cable may
be damaged if arcing occurs at 14 kV.

Carl Litton


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Wednesday, January 04, 2006 9:34 AM
To: tesla@xxxxxxxxxx
Subject: Re: HV xray cable revisited

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

So you don't think the arcing of the black coating to everything robs
any
power? Or in your case to grounded shield.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, January 01, 2006 6:27 PM
Subject: Re: HV xray cable revisited


 > Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
 >
 > Bart,
 >
 > That's funny that you say that. Actually, my experience
 > with x-ray power cable is to leave it on the ground. May-
 > be I'm "messing up" doing it that way, but I've never had any
 > problems using x-ray cable in this fashion. I simply strip off
 > enough of the outer sheathing and insulation along with the
 > semiconductive carbon tape for proper standoff of the 14 kV to 17 kV
 > from the inner 3 conductors to the outer
 > grounded braiding and leave the rest of the cable intact. I
 > solder all 3 of the inner condcutors together on the end as one.
 > X-ray cables are really overdesigned for the usual sub-
 > 20 kV voltages used to feed  Tesla primary circuits since they are
 > generally rated around 75 kVDC. The thin outer rubber
 > sheathing seems to be fairly durable, too, and effectively protects
 > the grounded mesh sheathing (yes, I do ground the outer-
 > mesh, just beneath the outer rubber sheathing and I have NOT
 > witnessed any significant Blumlein affects).
 > David Rieben
 >
 >
 >
 > ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
 > To: <tesla@xxxxxxxxxx>
 > Sent: Sunday, January 01, 2006 10:33 AM
 > Subject: Re: HV xray cable revisited
 >
 >
 > >Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
 > >Hi Mike,
 > >For a quick reply, "get the cable off the ground and your problems
 > >are over". I never allow hv feeds to be tossed along the ground.
 > >Take care,
 > >Bart
 > >
 > >Tesla list wrote:
 > >
 > >>Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
 > >>
 > >>Some time back I had a discussion on the list about stripping off
 > >>the black conductive coating that remains after the shield is
 > >>removed, for 8" or so on either end of my HV xray cable. It seems
 > >>this black coating still arcs if it is in contact to ground, or the
 > >>other xfmr lead (14.4 kV). Is this simply distributive capacitannce
 > >>causing coupling due to it's use on AC? Do you think this robs alot
 > >>of energy? Is it dangerous if layed on damp ground? I find running
 > >>the leads thru pvc to the TC cumbersome, and time consumming, when
 > >>I want to drag it outside for short runs. Since I want to run my
 > >>coil tonight for new years a quick reply would be greatly
apreciated.
 > >>
 > >>HAPPY NEW YEAR!
 > >>Mike
 > >>
 > >>
 > >>
 > >>