1. I already addressed Justa about this. He is correct about the Carrington Event-type of pulse (which is E3).
However...
2. If there is an artificial EMP, the E1 pulse will occur virtually instantaneously...and will leave our entire electrical/electronic infrastructure more vulnerable to E2 and E3 pulses.
I am presuming that we will have advanced warning of a Carrington Event-type of pulse, and be able to shut down some parts of our grid, and unplug as many devices as possible, so as to manually reduce the effects. There will likely be no such warning if we are attacked by another nation or a terrorist group that obtains a nuke on a rocket by some means. Proper planning would implement measures that would protect against BOTH natural and artificial EMPs - and my sole purpose on this thread was and is to let people know that the risks of either are not zero.
Sure, but keep in mind the E1 is very difficult to generate over a wide area. E1 will never (except the 1 in a billion year thing) be generated naturally. E1 will never be accomplished by a terrorist group or Rocket Man. The Chinese or Russians could probably do some, but it is speculative how widespread the damage would be.