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[–] nosdfnsdf 0 points 2 points (+2|-0) ago 

what sort of voltage spike do any of you expect an electromagnetic pulse to deliver to a 400+ volt power line? 20 volts? more?

you have a device, at the epicenter could plausably deliver a lot of voltage spike. A transformer can deliver all sorts of volts. but moving from the epicenter going miles out the voltage spike is drastically reduced like distance square or cube rooted. so a watch may stop, or a computer system may crash but steam generators, power grids,, unless their computers are left without electromagnetic shielding on the rooftop of their stucture theay gonna be ok.

a real sort of threat would be communication loss from radio jamming, or an aluminum dust poured over grid hubs or some shit.

lemme say again, Electromagnetic Pulse is a measurement of Volts over a certain period of time and as we measure way from the epicenter it diminishes by square or cube root i belive.. Antenna radiation should be same maths i think. a volt emp would fuck up a computer but to a power grid thad be nothing lest it hit the delicate computer controlling said grid.