The chances are pretty good that at some point, at least regionally, North America will experience an EMP of some sort.

If that happens, protecting your devices beforehand is the only way you can ensure they will work after the event; here are some answers to common questions regarding Faraday cages.

Will a microwave work as a Faraday cage?

No. If an EMP strikes, you will notice that all your electronic devices that you stored in a microwave oven will be rendered useless. The microwave is not a Faraday cage.

If I keep a backup mobile phone in my Faraday cage, will it work when I need it?

Yes, your phone will work perfectly. However, it will be rendered almost useless because the network will not be functional. The only form of communication after an EMP will be the radio. Click here to find out what radio you should keep in your Faraday cage.

Do Faraday cages need grounding?

No.

Is a shipping container a Faraday cage?

Yes, but just remember that you can’t just put the electronic devices directly in contact with the metal. Some people board the interior of the container with wooden panels.

Can I use this shipping container as a “Faraday garage” for my car?

Yes, you can definitely do that. Most cars fit in a standard shipping container, but just to make sure, go ahead and take the measurements before buying a shipping container.

If you turn off your devices, will they be EMP-proof?

No.

How do I test an object to see if it will work as a Faraday cage?

You can test any device that you think might work as a Faraday cage with a radio. Simply turn on the radio and place it inside the device. If the radio is still receiving a signal, then it’s not a Faraday cage.

Will a galvanized steel trash can make a good Faraday cage?

Yes, but the can has to close perfectly, and you will have to line the walls with cardboard.

The fact is we live in a world where an EMP is a possibility – it is a remote possibility, but a possibility nonetheless.

A Faraday cage is one way of ensuring your electronics are protected in the event of an EMP – but you have to make sure it actually is an effective Faraday cage.

Hopefully, this Q&A cleared up some confusion! To see more questions and answers about Faraday Cages, check out Ask A Prepper.