Re: HV xray cable revisited

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Bart and Mike,

Thinking out loud here.  If the arcing is between the center 
conductor and the black outer shield, then there is a problem that 
needs to be fixed.  If the arcing is between the outer shield 
(ungrounded) and a grounded object, I would think this would be 
expected due to the capacitance between the inner conductor and the 
outer shield.  The outer shield has no way to get rid of induced 
charge and would certainly arc to something grounded.  If the outer 
shield was grounded, I would think this discharge would cease.

Gerry R.

> 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