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Re: Official air breakdown voltage?



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 06:32 PM 11/27/2005, you wrote:
Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

Well, 60Hz is weird and definitely not linear. Haven't seen a breakdown table like DC, but it's around 20kV for 1", 100kV for 10-12", and 11 feet for 500kV (from a lineman that works on 'em hot and needs to know that distance). It's roughly following the rule of thumb 5x the voltage=10x the distance with current controlling how far it grows after that.

Be aware that "required clearance distances" are assuming typical wiring and construction practices and very non-uniform fields (as in a wire strung between insulators?)