I wouldn't want people to walk away with the false idea that
spacing is the only major parameter that determines arc
distance in a given dielectric media. The shape is extremely
important, as are any small sharp edges.
A blunt smooth surface for a given spacing can have several
times the voltage breakdown of a similar spacing with a
sharp edge or even a very small sharp protrusion.
People who think they can look at a complex structure and
predict where it will break down based on spacing are
kidding themselves and fooling anyone else who believes
them.
I suspect the incorrect bandswitch and capacitor breakdown
voltages that are tossed out as "fact" come from looking at
gaps or perhaps testing parts that are exceptionally smooth
or testing under other best-case conditions, or maybe even
just invented without any factual basis at all.
73, Tom W8JI
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