EMP Effects

Some people do not understand the threat of electromagnetic pulse weapons well enough. They range in size form nuclear to conventional. For example it is reported:
"The first recorded EMP incident accompanied a high-altitude nuclear test over the South Pacific and resulted in power system failures as far away as Hawaii. A large device detonated at 400–500 km over Kansas would affect all of CONUS." [CONUS= continental United States]

At contrast to this is the more conventional explosive energized EMP weapon. this is also a much smaller size. To see the device and its affect on a Taurus, check out THIS link.

There is reason to believe these devices could be used by terrorists. Designs of critical facilities should consider proper protection such as Faraday cages, etc.