Letter Re: A Prepper's Guide to EMP

Saturday, Feb 16, 2013

Mr. Rawles,
I have to make a comment about information in this article that is just wrong and I have seen others wrongly assume on the internet before.

There is ABSOLUTELY NO REASON to keep metal within the cage from touching the conductor that makes up the Faraday Cage. The reason is that the cage (assuming it has been constructed without gaps or holes, as it should be) forms an "INFINITE" barrier between the electric fields inside and outside of the cage. No electric field can go through the cage because they are dispersed across the surface and do not propagate through. The inside and outside are electrically isolated from each other.

As an experiment, take a radio that is receiving and you can hear the music, wrap it in aluminum foil and make sure the antenna is TOUCHING the metal. As soon as you make a completely enclosed cage, the radio will go to static because the waves CANNOT reach the antenna. The charge is only on the outside.

People falsely believe things cannot touch the side because the cage is a conductor. As I have explained, when constructed correctly, the outside and inside are in isolation.

Just to qualify my responses, I am an electrical engineer who studied electromagnetics in school and I work in the power industry. I did not list the equations to prove the material, but I can send detailed information about why electric fields do not go through conductors, only propagate on the outside. Or, you can pickup any introductory electromagnetics textbook and read about Faraday's experiments and equations and other information for yourself from people who are a lot smarter than us.
Thank you, - Cason R.


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