Bon dia!
Just a few notes. Being or not being in operation does assure protection against EMP effects. The EMP can generate its own magnetic-induced current in any conductive element belonging to any electric or electronic device. No need to be connected to a source or running. The vulnerability is the worst for the electronic components, which are generally designed to operate between very low and delimited parameters of current and tension. Of course, if the device is not connected to the electrical power supply, you eliminate one possible vector of aggression: the induced intensity in the electrical network. Any normal electrical protections, like these we have in our homes or in the factories or offices we work, will not work properly. I will try to explain me…First, I have my own doubts about if they will switch-off the load from the power supply, given the frequencies and emitted by the pulse and its short duration. And second and more important: at best, if these protections work, they will isolate your home / factory / office from any effect coming from your power supply, but if you are still inside the effect radius of the EMP, you will have your own short, powerful and “private†induced current in all the conductive elements independently of any protection. The short wavelengths detected in an EMP causes that a lot of electrical circuitry could work as an antenna. For example, for an electronic plate protected by a simple fuse, the device will be fried regardless of the state of the fuse. The short wavelengths detected in an EMP causes that a lot of electrical circuitry could work as an antenna.
And talking only about the generators, their electronic parts are few and simple. Lots of them (especially those that must be transported by trailers) have metallic enclosure and all of them (if installed properly) have good ground connection. If the generator is not connected in any way, its chances to survive will be better.
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