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Re: HV xray cable revisited



Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi David,

I don't even use that same cable any longer (it was old and used, probably damaged). Nowadays, I just route a standard conductor through elevated pvc and it's been problem free for the last few years. But, the cable Dr. R. mentioned sounds like really good stuff! Much more appealing feed electrically and mechanically.

Take care,
Bart

Tesla list wrote:

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