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*To*: tesla@xxxxxxxxxx*Subject*: Re: Minimum distance*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Wed, 23 Aug 2006 18:49:36 -0600*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Old-return-path*: <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>*Resent-date*: Wed, 23 Aug 2006 18:49:49 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <tWiYpqyPsZJ.A.mTC.teP7EB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

Matt D.

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx> Hi Ben, all, A 10 kV/inch rule of thumb should prevent almost any flashover danger, at least at 60 Hz or DC, as you say. However, there are a number variables when determining the breakdown distance vs voltage, such as atmospheric conditions (temperature, humidity, barometric pressure) and the physical size and geometry of the electrodes. This makes an "ironclad" voltage/spark length graph all but impossible. I think the theoretical maximum voltage standoff that 1" of air can withstand is 76 kV, but of course that's with smooth spherical electrodes of at least the dia- meter of the spark gap distance itself. Any deviation from this "controled" laboratory spark gap setup will result in a much lower kV/inch rating. I've heard that with needle point electrodes, the kV/inch is somewhere between 15 kV and 25 kV(DC). And of course, with high frequency AC, all bets are off as the voltage/spark length ratio goes down significantly with a subsequent increase in frequency. Also, remember that a 60 Hz AC rms voltage reading must be multiplied by 1.4 to determine the true sine wave peak voltage. David Rieben

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