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Re: HV xray cable revisited



Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Mike,
No, you don't want the inner conductors to arc to the
black tape-like coating as this WILL definitely rob po-
wer. What you want to do is peel the black carbon tape back several inches from the "hot" end to provide
the proper HV standoff so the inner conductors DON'T
arc top the carbon tape or the mesh sheathing.

David Rieben


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, January 04, 2006 9:33 AM
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
> >>
> >>
> >>
> >>