[Amps] Coax for MHV connectors?

[Jim Barber]

I need to make up some MHV cables for a 4KV 2A max DC supply, (both B+ 
and B-) and I made the mistake of looking up the voltage ratings for 
RG-58, RG-59 and LMR-240 cables, all commonly used with those connectors:

RG-58        1900V
RG-59        2300V
LMR-240      1500V

In a word, yikes! RG-59 has the highest rating, but I like it the least 
for exposed cables because of the solid center conductor

The connectors are rated at 5KVDC, but what cable type? It seems like 
every time I think I know something... ?

I'm tempted to give it up and machine my own bulkhead pass-throughs out 
of acrylic and use HV cable instead. In fact I would have already except 
I'd really like the cables to be detachable.

Comments?

Thanks,
Jim N7CXI