Faraday Cage/ EMP Proof Box





Introduction: Faraday Cage/ EMP Proof Box


In the event of a nuclear strike an EMP or Electromagnetic pulse is released frying all circuits near the area.  This inscrutable will teach you how to build a  Faraday cage. A  Faraday cage is a box that protects all electrical items placed in the box. I'm sure there are better ways to build a Faraday cage but this is a cheap version.

Step 1: What You Need

- A metal box
-Duck tape
-Something that you want protected

Step 2: "Building the Box"

1st you need to line the inside of the box with newspaper, use lots of it. 2nd wrap the objects in newspaper and place them in the box. 3rd if there is extra space put more newspaper on top of your items, that have been wrapped already, place in the box  .4th Close the lid and tape it shut.

Step 3: How It Works

Thanks for looking. Make sure to vote for this on the Be Prepared contest.  I will try my best to answer questions. 



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a microwave is also a good solution. just don't start it with your cellphone in or it's gonna be fireworxx lol

1 reply

This isn't true for all nukers. I've placed phones in to test, and they've never lost signal. The mesh prevents microwaves from escaping, sure, but it does not appear to prevent 500-900mhz ranges.

The blast can contain x ray and gamma. Mesh doesn't work with these high frequencies. Use thick, solid sheeting. The denser the metal the better, generally. Using a mHz band radio to test with will give you false hopes. Try something with a much higher frequency such as a 5 or 10gHz walkie talkie. This will be much closer to reality, but still, this research has all been done before. So it is probably best to just look it up. Also, according to the Naval EW guide, the best way to combat EMP is to use grounding to the Earth. Any metal object that isn't grounded at the time of the blast will become a high voltage capacitor creating a huge electrical potential with the Earth. The eddy currents that course though the metal box can resonate, given the proper frequency, and act as a repeater, ON THE INSIDE. (In an EMP scenario there is a broad spectrum of RF and likely a resonance will be found.) The design in this instructable is good for keeping static away from your bullets. NOT EMP.

Here is a better method, line a fireproof same with a conductor (aluminum foil) and mesh to keep it from tearing, use conductive tape at any seems. Line with rubber or wood to insulate and place stuff like HAM Radios, usb drives, and car computer components inside. Anything else that you want to protect can go in too. Remember to ground properly. To check proper sealing, place radio inside and if when closed inside you loose reception you have yourself a fireproof/emp proof safe with electronics that could save you and your family.

idd, put your devices inside rubber boots and put em in the box.
The thicker the walls of the box, the better shielded it will be.
your car will most likely be okay. It will shut off while running so could be a bit dangerous but you'll probably be able to just restart it after the emp.
They did studies on those things. http://jalopnik.com/5937778/how-to-prepare-your-car-to-handle-an-emp-and-why-you-shouldnt-bother

So this might be a dumb question, but could you use something like "Flex Seal" to line the inside of the can? Since it creates a rubber seal, wouldn't it be an insulator? And if so, how thick would the coating have to be?

First let me say that __I could be Wrong. the way i remember it,is that govenrnents are spending a lot of money on research to build a EMP proof "box"....."".In the event of a nuclear strike an EMP or Electromagnetic pulse is released frying all circuits "".........and they have NOT yet come up with something that WILLwork.. maybe since(in the meantime) they have. if not,EMP type weopon might send us back to"DARK ages".

2 replies

I worked on one of the projects in the 80s, and yes they do work.

The how to may still be classified so don't ask, I won't tell you how.

But for the Ammo can I would use aluminum tape to seal, not duct tape.

Actually, a Faraday cage is quite simple to make. It must simply be an interwoven cage of copper and steel, or perhaps brass. Mythbusters built one that was quite effective, blocking radios, cell phone signal, etc, out of a simple box of brass mesh. The only requirements are that the material be conductive, and that any holes be smaller than the wavelength of the desired radiation. It is also advisable that the cage be grounded and very thick, if full blockage of radiation is desired.

So, wrap stuff in newspaper, put it in a steel box and tape it shut?

2 replies

The idea of the newspaper is to keep your device from touching the steel. I wouldn't use paper though rubber definitely would work better, if you can't find that get something else nonconductive plastic sheeting, foam, etc

Yes, but lining the box with rubber would work better.

I guess this is better than "Get an EMP proof box and put your stuff in it". ;)

3 replies

im not sure if they make those.

they do but there stupidly expensive way easier to just make your own.

They do, but this is certainly a lower cost option, especially if you have an old ammo can available.

I'll looking into building one to protect my stuff from the solar flare that may or may not be abosored into earths atmosphere

1 reply

There will be a solar flare hitting earth, "ONE DAY" You'll probably be long dead by the time this happens or maybe not no way to know. But this has happen many times in the past just not many times since people have been on the earth I think the last time was in 1859, which disrupted and disabled the telegraph fortunately that's about as advanced as we were back in the day. Never hurts to prepare though.

Also,,What is the Duck/Duct tape for ,really ???