Bill Horne wrote:
I have a run of RG-8 coax inside a conduit, and I'd like to keep it in
service if possible. How can I test it before I risk my finals trying to
put power into it?

It's OK AFAICT with a VOM.

73, Bill W1AC

Bill
Apply a megaohmmeter to test for any breakdown in the dialectic between
the center conductor and the shield and between the shield and ground.
A test voltage of 500 would be the highest I would go and I think three
hundred would tell you all there is to know about the integrity of the
insulation. You already know that the condition of the copper is
essentially unchanged.
--
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
for general use." Thomas Alva Edison