Re: HV xray cable revisited

["Tesla list" <tesla@xxxxxxxxxx>]

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

I'll have to work on getting those ratings. I do know that  our xray systems
run up to 150KV DC. And as I've been set straight on, that means 75KV to
ground, each cable. I also know that the stripped back portion easilly
insulates against the 14.4 KVac.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, January 06, 2006 12:10 AM
Subject: Re: HV xray cable revisited


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Mike,
>
> As I understand it, the coating arcs not at the ends, but when the
> black coating comes in contact to a grounded object (or the ground
> itself). I suspect the cable is not sufficient for AC applications at
> the voltage your running. Check around and you'll see DC ratings on
> high voltage cable. AC and pulsed DC specs are much lower, so I
> wonder if the cable is not sufficient for the application. But, we
> can only make our best guess. As the cable is in your hands, possibly
> you could find out it's DC and AC ratings.
>
> Take care,
> Bart
>
> Tesla list wrote:
> >Original poster: "MIKE HARDY"
<mailto:MHARDY@xxxxxxxxxx><MHARDY@xxxxxxxxxx>
> >
> >OK. I have 8" of the black conductive outer layer stripped back on both
> >ends, all shield removed. I know the cable is good, because it was pulled
> >from a functioning xray system (we just redid the test cell for a
different
> >system). I personally think it's capacitively conducting AC. A cap (the
> >cable) with DC applied (the way xray PS are) charges to its value and
then
> >just remains that way. A cap with AC applied will conduct. I just want to
> >use this cable safely, and without going through the hell of stripping
the
> >black coating. Mine is a solid continuous bonded sheath, not a tape I can
> >peel back. I hope I'm making myself clear.
> >----- Original Message -----
> >From: "Tesla list" <mailto:tesla@xxxxxxxxxx><tesla@xxxxxxxxxx>
> >To: <mailto:tesla@xxxxxxxxxx><tesla@xxxxxxxxxx>
> >Sent: Wednesday, January 04, 2006 10:36 PM
> >Subject: Re: HV xray cable revisited
> >
> >
> > > Original poster: "Barton B. Anderson"
> > <mailto:bartb@xxxxxxxxxxxxxxxx><bartb@xxxxxxxxxxxxxxxx>
> > >
> > > Hi Terry,
> > >
> > > I understand the conductive layer technology for corona losses and
> > > the dielectric layer is around the conductor and then the main
> > > insulation followed by the jacket. But, as I understand it, only the
> > > outer jacket was removed so I don't think it will be a problem. The
> > > oddity is the cable arcing to the outer jacket before he removed it