Re: HV xray cable revisited

["Tesla list" <tesla@xxxxxxxxxx>]

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
> >>
> >>
> >>
> >>