I don’t think a Faraday Cage is sufficient to stop an EMP.I believe you need a mu-metal cage, to block the magnetic part of the pulse.
Nah - not required.
A couple of facts for EMP generated by Nuclear devices in the atmosphere. According to an Air Force officer who gave a talk some 30 years ago - you can expect to see something like 30KV/m2 from DC to many Ghz. The pulse will be several nanoseconds in duration.
The officer wasn’t sure ANYTHING would be sufficient to shield against such a pulse.
That being said - from some other things I’ve read/heard - you aren’t going to have any significant effect on a magnetic field. A professor in EE told me about his brother having a contract to create the equivalent to a Faraday cage for Magnetic fields from the Navy. The brother set up an experiment where he created a Mu-metal cage around a detector on the theory that the cage would route the field around the detector. He placed a record player with a bar-magnet 100 feet away. Real nice sine-wave detected inside said cage... so much for Mu Metal..
“I don’t think a Faraday Cage is sufficient to stop an EMP.I believe you need a mu-metal cage, to block the magnetic part of the pulse.”
Steel will do the trick, as it has sufficient permeability.
The conductivity of the standard cage should take care of the magnetic field component, at least to the extent it handles the electric component.
Besides, the mu-metal would saturate anyway in response to an EMP, blocking only a fraction of it.