Can you shield an entire city block? An entire building?
How about a city?
Such weapons can be as small or as large as desired. There are multiple platforms for delivery.
Everything is in change.
This is going to damage semiconductors and maybe some low current discrete electrnics.
It won’t do squat to power lines or transformers. Or to your can opener. Your toaster will probably be okay. If your electric oven just has knobs, it will be fine (timers and thermostats might be toast) so relax.
You don’t need to shield whole buildings.
I want one in my pocket.