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YES, to an extent, an old microwave oven may be re-purposed as a Faraday cage against EMP (electro magnetic pulse).
A Faraday cage by its very definition does not have to be grounded to reflect or keep out electro-magnetic waves (they normally are not grounded). If a microwave oven is used as an EMP shield (Faraday cage),I would suggest that the cord be cut and removed to prevent it from becoming an antenna. Not a bad idea, but in theory, not necessary given the existing shielding of the chamber itself. Bought some aluminum attic radiant barrier foil a few years back, it’s like heavy duty aluminum foil with threads inside for strength. I regret to inform you that a microwave oven is only partially effective as a Faraday cage, something you can test for yourself. In any event, there are better methods of do-it-yourself Faraday cage design, as you mention. I wouldn’t have expected the shielding on a microwave oven to do anything but protect the user from the oven.
If I remember correctly, 1) there is no screen over the magnetron’s output port (duh!) and 2) there is high-voltage DC applied to the magnetron. Go to any old appliance store and buy old single door refrigerator or freezer, , take off the rubber gasket, so that the door metal contacts the main shell, then line the inner walls completely with cardboard or styrofoam, place your electronic on cardboard covered shelves, you can easily store radio’s ,lap tops,etc. A corollary question is this: How would the generator connected to that Automatic Transfer Switch fare in an EMP event?
I suspect what has happened is that the microwave manufacturers have cheapened their units, and provide just enough RF protection to keep your eyeballs from being fried.
Less about the effects of the EMP or even the cause because in today’s political arena we are all too aware that an EMP is a distinct possibility. Please be aware some of the sites we link you to could have pop ups and that we have no control over them. Before an event such as an EMP, it is vital as part of prepping to meet people in your community that are also preparing just in case a catastrophe hits.
Learn to make homemade pepper spray there's lots of different recipes on the Internet and run out to Walmart while the season clearances are on and buy a bunch of water cannons those suckers shoot 50 feet ..
Gangs of unprepared looters going door to door searching for food and supplies will be a big problem.
ONe of the things for me that was missing here is family, ie the preppers family or the preppers age. The comments above is just part of the excellent exchanges, ideas, suggestions and discussion in part one, but it shows that there are many people awake, aware, willing to share knowledge and ideas to help others. Some of those ideas could very well be the difference between being one of the millions that would die within the first month, and those that will live.
As long as the holes in the screen are smaller than the wavelength of the frequencies you are trying to protect against, screen works just as well as a solid piece of metal.
In the case of a nuclear detonation, the electromagnetic pulse consists of a continuous frequency spectrum.

Since the holes of the screen mesh of a microwave oven are small compared to the wavelength of the microwave itself, little radiation can leak out.
I do know that cell phones operate at lower frequencies, however I would assume that a microwave shielding would also block lower frequencies by default – since the microwave frequencies themselves are higher and require smaller holes in the screen. Since EMP is nothing more than a high energy RF pulse, any Faraday cage which will shield you from EMP will also shield you from RF.
I am also somewhat surprised that the microwave shielding seems to be apparently somewhat ‘tuned’ or restricted? What I found is that supposedly, a microwave is permitted to radiate up 0.25 Watts of power. The technology has been around to create one for many years and the possibility of a natural cause is as old as time.
However, we will never link you to a site that requires you to make any purchase or join anything to view the article. That is the dependence factor that the government uses most effectively - fake monopoly money. Boarding up your windows will make the home harder to breech but will also attract attention.
A Faraday cage is an enclosure formed by conducting material or by a mesh of such material. Most of the energy is distributed throughout the lower frequencies between 3 Hz and 30 kHz.
There are also mesh screens on the sides of the oven cavity, one to protect the oven light while allowing it to shine into the cavity, the other to permit ventilation. The article states that most of the energy will occur below 30 KHz and while I suspect this frequency may depend on the actual type of EMP involved, this is still close enough to the AM band to use an AM radio for testing. The microwave oven does apparently restrict these frequencies, but the attenuation itself in dB is unclear.
Eventually like it or not man made or natural there will most likely come a time when the grid becomes disabled. DeanNUCLEAR POWER PLANTS - KNOW WHERE THE CLOSEST TO YOU IS LOCATEDAnother point made by commenter "smilardog" is that nuclear power plants would go into meltdown mode after an EMP.
Looters will eventually get in even if they have to set fire to the house and wait for you to come out. A microwave oven’s very design is to enclose the electro-magnetic radiation of microwaves, and keep them from getting out.
However the first effects of nuclear detonation are the very-high-frequency pulses, in the microwave range, and can work their way into Faraday cages if there are cracks, seams, or vents. Simply tune the radio to the strongest local station and put it in whatever you are testing. We in America have already seen that technological warfare is a distinct possibility since the North Korean Hackers waged a war of sorts against Sony Pictures.

Get creative I learned of an awesome awesome one foot pit trap that's easy to make and I guarantee you no one would like it if they stepped in it .
They can then shoot you as you exit the burning house. My plan is to board up the 1st floor windows over the blinds so you can't see the wood from outside.
We all know that commercial companies don’t put anything more than what they have to for fear of reducing their profit, so it would reasonable to assume microwave ovens are probably between 40 and 50 dB of shielding. If technology is  being used by one country to control the business decisions of a company in another country… it’s not so far fetched to wonder how long before something a lot more serious than a movie is attacked via the disruption of technology? Step into the hole the board tilts jams a bunch of nails into your leg as your foot plummets further down the whole if you try to pull it out you're going to rip your foot off practically . Then I will put a for sale sign in the front yard and put the "house has been winterized" signs back up like they were when I bought it. I just did this with my microwave and while the signal did get rather noisy, it could still be heard, even with the door closed.
Its not bad, but it just isn’t enough to fulling attenuate the AM station to the point that it is inaudible. It is up to you to use common sense and your best judgment when using any information contained within the articles.
I'll be sure not to have any light coming from the windows at night and smoke from fires during the day. Most effective, good old aluminum foil and ammo cans, even with the rubber seal, although you do need to make sure that any metal like an antenna does not touch the foil or the steel of the can.
Sheltering in place won't be easy, but moving a stockpile of food and whatnot without a vehicle is impossible. Blend about 10 habanero peppers and about half of the ever clear in a blender, put in glass container and set aside for about a week, blend again and set aside for another week. If I could afford it, I would get an old diesel truck that will run without any electricity.
Then strain into a spray bottle using many layers of cheese cloth to completely filter all small and large particles.
Also, buy a case of wasp and hornet spray - brutal but effective in life and death scenario. Such an enclosure blocks external static and non-static electric fields by channeling electricity along and around, but not through, the mesh, providing constant voltage on all sides of the enclosure. Since the difference in voltage is the measure of electrical potential, no current flows through the space. More can be found with a simple search using key words "Building a faraday cage," in whatever search engine you use.A few how-to videos below show how to build your own Faraday Cage.

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