I better correct two pre-coffee typos I made:
That is NOT the voltage breakdown of the coax from center to shield. That
is a wiring class voltage, similar to the jacket punch-through to a bare
external conductor.
If you take regular foam dielectric "RG6" (which is almost never a real
RG6 style) cable and strip back the end, and high pot the cable, the
center to shield dielectric breakdown of cable ***withOUT** a flaw is over
12 kV.
This means modern RG6-type (which was also called "F6" and isn't a real RG6
military number with copper shield and solid dielectric), if it does not
have a serious internal flaw, at even a remotely reasonable SWR, is heat
limited.
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