George,

The old MIL-STD-275 has or had a nice section on high voltage that seems not
to have made it into the IPC specification.  It talks specifically about
corona effects and the "snap" voltages.  Although, I may be mixing my
specs... MIL-***-2000  REV - had some nice data, as does or did the
MIL-P-28809.  The '275 does talk in terms of High Voltage.  If you don't have
those spec's give me a yell and I will break the glass bookshelf.  The one
marked "In case of Emergency, Break Glass."

Good luck,
Boston Brad
781 858 0783

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