A Faraday cage works by three mechanisms: (1) the conductive layer reflects incoming fields, (2) the conductor absorbs incoming energy, and (3) the cage acts to create opposing fields.
Yes, as long as the holes are small with respect to the wavelength of the incident electromagnetic wave. Yes, there are many conductive enclosures that can be used, including ammo cans, metal garbage cans, anti-static bags, and even old microwave ovens. Anti-static bags are readily available to protect electronic components against electrostatic discharge. I read on another blog that an old microwave oven (old plugged of course) could be used for small items.
An EMP is not a continuous event, it is a burst of energy that is released, the damage is done, and then it’s gone, unless it is caused by a solar storm which could last for several hours or even days.
As stated in the article, a solar storm is not likely to produce effects that will hurt small electronic items, unless they are connected to an external long wiring system, which could include the electrical grid, your landline telephone, your local cable TV provider, all of which contain long enough antennas to induce large voltages onto the system, and into connected devices. The truth is that no one knows for sure what will work without knowing the exact characteristics of electromagnetic pulse and that is impossible to know in advance. I dont think you all got my point, You have explained what an EMP does and how long it lasts, but you, me and everyone here does NOT know when one will happen. What you keep in your Faraday cage always are the spare electronic parts for your car or truck, your spare ham radio, your extra laptop computer, etc. If you have a set of 2 way radios that work ok in your area, and you are happy with them, then buy a second set and put them in the cage. I keep hand held wallis talkies for communication on the farm and with my neighbors Ina faraday box.


It’s good that you do such important work with things for a living because if you had to interact with people you would be out of a job. Some articles I’ve read refer to super EMP devices, nuclear devices designed for maximum magnetic yield. If it does happen, I figure it at least gives me a fighting chance, and if I do have a break-in, chances are that the burglars will overlook that antique.
I have a lead lined ammo box , that was originally used to transport radioactive pharmaceuticals in for small stuff . Instead of thinking of a faraday cage like you would an umbrella in a rainstorm, think of it instead like a sponge you are standing under.
That is perhaps the best analogy I can come up with for how a faraday cage is supposed to work. If the cage is made from something non-conductive, the free carriers are not mobile enough to realign and cancel the incident field.
Each has its own level of effectiveness as covered in my book, Disaster Preparedness for EMP Attacks and Solar Storms. A steel trash can with a very tight fitting lid does a pretty good job of acting as a Faraday cage.
I tested ammo cans for my book, and they didn’t do great because of the less than perfect seam going around them.
I don’t expect to have a serious auto accident, but that doesn’t mean I don’t buy coverage for it. For example, if silver (the best conductor) is used in place of aluminum, the skin depth at 200 MHz is reduced to about 4.5 microns.


It would be fine sitting inside a Faraday cage as long as you’re not scrubbing your bare electronics against it.
EMP is a high energy radio wave, but radio waves are not current flow, otherwise they couldn’t go through air which is an insulator. Check out disasterprepper videos (or my name) and you’ll find one on Faraday Cage testing.
Arthur Bradley, author of Disaster Preparedness for EMP Attacks and Solar Storms, answers a few basic questions and perhaps debunks a few myths.
The bottom line is that an ungrounded cage protects the contents from harmful electromagnetic fields as well as a grounded one. I am not sure of your experience, but I say this as a NARTE certified EMC engineer who has worked in electromagnetics for 20 years. As an example, consider that for a frequency of 200 MHz, the skin depth of aluminum is only about 21 microns. The results from testing three different types of bags are provided in Disaster Preparedness for EMP Attacks and Solar Storms.



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