[Bob Ireland]

***That is also why the inside must be lined with something non-conductive. If the contents inside are in contact with the metal walls they are subject to the EMP
No, that’s not correct***

You will have to argue that with the engineers and the military. Every paper I have read, and I have read many (can link some but not on this tablet) has clearly stated that and the military equipment cases always set their equipment in non-conductive foam.

[meyer]

I think isolating the device from the metal case/barrier makes some sense. It could serve as something of an antenna if connected, versus a shield if not.

[bigbob]

That’s to keep the stuff they put in them from rattling around. A Faraday cage works like the roof on your house, it’s the outside that keeps rain from coming in, not your interior ceiling. Electromagnetic radiation cannot penetrate the metal shield, this is just basic electronic physics, nothing I need to argue with anyone about.

Here’s a good demonstration, absent the usual pseudo-scientific BS:

https://www.youtube.com/watch?v=aMct99DiZak

As he says, you’d like about 50dB of attenuation to protect electronics against EMP. He test using a couple of watts from a handheld radio a foot or two away which represents about 100 dB of dynamic range and is more than needed, but still achievable with layers of shielding.

Covid 19 benefited the TP makers, and EMP threat will be great for Reynolds Aluminum.