For kicks, I once tried using motor starting caps for PFC's.  The case
became quite warm within less than a minute of run time.  Useless.

Start caps are only designed for brief, intermittent operation, when a motor
is just spinning up.  Motor Run caps are designed for continuous operation.
You want to use motor RUN caps for PFC's, not motor START caps.  Too bad,
the START caps are so much cheaper!

Regards, Gary Lau
Waltham, MA USA

>Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com> 
>Hello All,
>I was wondering,
>Would a bank of paralleled motor-start caps be suitable as a power factor
>correction cap? I I calculated, if memory serves, something like 80uF or
>90uF for my 12kV 60mA NST. When powering my TC, it blows a 10 amp fuse no
>problem...   ...and I really wish it wouldn't. Since then I could safely
>fuse my variac with the fuse holder built into it.