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Old 10-22-2013
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Re: Lightning protection- precision 18

Last I checked, nothing in this world could take a direct lightning hit. The zener is meant to snub any transient or induced current/voltage picked up by wirings. The idea is that if the positive wire get lifted above 24V, the zener would zap it down. If the negative line voltage gets lifted, the zener conducts like a diode, zapping the surge voltage. One may argue that the surge voltage slew rate is so fast that the diode may not responds fast enough, well its cheap and easy but offers no guarantee, still better than not doing anything.
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