How to Harden Any Electronic Against E.M.P.

So all of my regular readers know about and understand the threats of E.M.P. If you do not, or are even slightly unsure, please check out some of my previous posts about E.M.P. for a full explanation. Now many have been wondering, “Is there any defense against this horrible E.M.P. threat?” Well yes, there is. There are ways to save our modern days’ complicated electronics from being decimated by an E.M.P. wave.


How? By something called a Faraday cage. A Faraday cage is a screened metal box, insulated on the inside to prevent any inside objects from touching the electrically conductive outside screen. What happens is that electrical currents, even one as quick, subtle, and high powered as an E.M.P., travel around the box, and not into it. This box is the most powerful and important preparation for E.M.P.

To build a Faraday cage, you must first build a box, preferably out of wood. Make the wooden box big enough to house all of your important backup electronics, and make the box’s wood as close together as you can and seal the wood with wood glue (wood glue is sold in almost every hardware store). Make an opening top lid with hinges. On the outside of this box needs to be continuous metal, meaning that all of the metal must connect when the box is closed. You need to make the metal on the outside of the box either sheet metal or screen metal (like the stuff on screen doors). The military uses screens to build Faraday cages, and this type of metal is preferred. Try to find the screening with the smallest openings in the screen, but other screens will work too.

The screens for the sides of the box need to be cut to the size of the faces of the box. The screens for the top and bottom need to be cut slightly larger, and need to have the corners cut off in squares (so that the screen resembles a plus sign). This is so you can overlap the screen over the sides of the box, ensuring that they are touching.

Place the screen around the wooden box in a manner that when the box is close, ALL of the screen faces touch each other at all points on their edges. Attach the screen to the box by staples or glue, or even better, both. Put the screens for the sides of the box on first. Then fold the the four flaps on the top and bottom (created by cutting the corners off of the top and bottom screens in squares) over the sides of the box. This creates a continuous metal surrounding around the box, and you now have an effective Faraday cage.




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2 Replies to “How to Harden Any Electronic Against E.M.P.

  1. Most electronics are not going to be of any use when the grid is down for 20 years or more.

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