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An EMP is just one of the threats that can hold our society at risk of catastrophic consequences. An EMP (electromagnetic pulse) can be caused by a high-altitude nuclear weapon that will interact with the Earth’s atmosphere, ionosphere, and magnetic field to produce an EMP radiating down to the Earth and create electrical currents in the Earth. A determined adversary can achieve an EMP attack without having a high level of sophistication. The concern of EMP attack is such a fear of national security, there has been a congressional committee to discuss this threat. “Commission to Assess the Threat to the U.S. from EMP Attack”.


In July of 2012, a coronal mass ejection took place.   A “coronal mass ejection” or C.M.E. is a massive burst of solar wind and magnetic fields rising above the solar corona or being released into space.   This was reported to be the most powerful CME discharge ever recorded from our sun.  The 2012 discharge missed Earth.  However, if this C.M.E. had occurred only a week prior; it would have struck our planet and subsequently led to a complete technological disaster according to researchers from the University of Colorado Boulder.

To put into perspective the size and enormity of this event lets consider it’s speed (force) only. The typical C.M.E. from our sun takes between 2-4 days to reach Earth.  The coronal event in 2012 would have reached earth in just 18 hours.  It’s estimated speed was approximately 7 million miles per hour!

While there are systems in place that are designed to warn us of solar flares and CME activity… It’s unclear on whether the teams tasked with monitoring the NASA “Solar Shield” would have been able to alert emergency services in time.   The speed of this event was faster than anything previously seen in our modern space age.



Policymakers haven’t taken this near-miss seriously despite the fact that a senior member of the Congressional Homeland Security Committee warned that there is a 100% chance of a geomagnetic event capable of crippling electrical grids across the globe.  Certain government organizations have deemed this the “KILL SHOT”.   If such an event were to take place it would take up to 18 months before power could be restored to the grid, and it’s estimated that 9 out of 10 people would be dead within one year.  Once the electrical grid goes down, commerce systems will no longer function, food production, farming, and delivery will grind to a halt almost instantly, water treatment facilities will cease to work and millions of diabetic citizens will perish from the inability to keep insulin cold.  The ramifications would be serious and almost immediate.


When discussing what measure can be taken to guard against an EMP; it’s first necessary to get rid of a few myths.  It’s essential to understand the nature of EMP and how it works.

One major myth or misconception is that an EMP is similar to a powerful bolt of lightning. While the two (lightning and EMPs) each produce similar results; an EMP is actually more like to a super-charged radio wave. Any bright ideas about using lightning-rods, lightning arrestors or any such grounding techniques will undoubtedly fail in protecting equipment from EMP.


Another false concept is that EMP “out of the blue” can harm your body or cause major damage to your brain way lightning strikes can.  The EMP levels created by a nuclear weapon would be so minimal, they wouldn’t pose a serious health threat to plants, animals or man.  This is assuming that the EMP isn’t concentrated.

EMP can be concentrated. EMP occurs when it is “pulled in” by a stretch of metal. EMP would be dangerous to living things in this case.  It could become concentrated by exposed metal girders, telephone lines, long antennas or anything similar.  Avoid being very close to such concentrations in the event of nuclear war.  A minimum distance of 8 feet from such stretches of metal is recommended for nuclear-generated EMP.

The concentration of metal, wiring etc…  is the main reason that most electrical equipment would be destroyed by the EMP.  It’s not that the electrical equipment itself is really that sensitive, but rather the massive electrical surge would be so concentrated that anything working on low levels of electricity would be completely fried.

So What Can I Do to Prepare For An EMP?

Protecting Small Equipment

A Faraday box is the easiest way of protecting most small electrical equipment that can be unplugged from the power source.  A Faraday box is a metal box designed to divert and soak up the EMP. If the object placed in the box is insulated from the inside surface of the box, it will not be affected by the EMP traveling around the outside metal surface of the box. The Faraday box simple and cheap and often provides more protection to electrical components than “hardening” through circuit designs which can’t be (or haven’t been) adequately tested.  Many containers are suitable for make-shift Faraday boxes: cake boxes, ammunition containers, metal filing cabinets and so on.  Despite what you may have read or heard, these boxes do NOT have to be airtight due to the long wavelength of EMP; boxes can be made of wire screen (one or more layers of fine copper mesh). The Faraday box is a great solution assuming that you aren’t using the equipment when the event occurs.  (not likely)  It is highly advised that you prepare a “back-up plan” Faraday box filled and ready for such an occasion.  Shortwave radio, weather radio, small television, spare telephone and anything else you may need after.  Do remember that the power grid will likely be wiped out so anything you keep will have to run off of a fuel-powered generator.  You should be focused on staying informed but not needlessly entertained.

The only two requirements for protection with a Faraday box are:

(1)The electrical equipment inside the box can’t touch the metal container. Insulating with cardboard, rubber, plastic or even wads of paper are acceptable methods.
(2) The metal shielding must be continuous. There can be no large holes or gaps in the shielding.

Grounding your Faraday box is not advisable. Although EMP and lightning strike are very different in the big picture; a good example of how NOT grounding your Faraday box is beneficial would be to look at lightning strikes on a flying plane.  These strikes seldom fry the electrical components or occupants because the metal shell acts as a large Faraday box.  Since the plane isn’t grounded, the effects of lightning strikes are minimal.

Certain electrical parts are incredibly sensitive to EMP.  These include IC circuits, microwave transistors, and Field Effect Transistors (FET’s). If you have electrical equipment with such components, it must be very well protected if it is to survive EMP.
Once again A Faraday box is the best solution.

There is a shortlist of electrical equipment that is innately EMP-resistant.  This includes large electric motors, vacuum tube equipment, electrical generators, transformers, relays, and the like.
This kind of equipment could possibly survive a massive EMP surge and would likely to survive if a few of the precautions discussed below were taken in their design and deployment.  Battery operated equipment will also be impervious to EMP.  If you don’t want to buy a wealth of batteries for every appliance you own or use a radio set up with longer than the 30-inch antenna, then you’ll need to use equipment that is “hardened” against EMP.

Larger Equipment Hardening and Protection

If you must operate ham radios or the like during a nuclear attack; there are a few methods which will help to protect electrical circuits from EMP.  This various vary in design as there are multiple ways of neutralizing the effects of an EMP.

Design variations include the use of tree formation circuits (rather than standard loop formations);
the use of self-contained battery packs;
the use of induction shielding around components;
the use of loop antennas; and (instances of solid-state components) the use of Zener diodes.

Implementing these design elements can eliminate the chance an EMP surge from power lines or long antennas damaging your large equipment.
Another useful strategy is to use grounding wires for each separate instrument which is coupled into a system an EMP system so that it has more paths to take in grounding itself.

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18 thoughts on “Understanding EMP: What Preppers Should Know”

  1. Great article, but I need help understanding these 2 statements.

    “Despite what you may have read or heard, these boxes do NOT have to be airtight due to the long wave length of EMP; boxes can be made of wire screen or other porous metal and be equally effective.”

    “The metal shielding must be continuous. There can be no large holes or gaps in the shielding.”

    The 1st indicates wire screen is okay. The 2nd says there can be no large holes or gaps. Is metal window screen okay but hardware cloth with 1/2 inch holes is not okay? The bottom of my metal filing cabinet has 6 round holes that are each 1 inch diameter. How big of a hole is acceptable? Thanks!!

    1. Its almost on the same concept as your microwave oven. Ever wonder why you are not ‘irradiated’ when watching your food spin around through that glass window? Its a pretty hardy ‘wave’ that can heat the water inside an object. A microwave ‘wave’ is about the diameter if a pencil. Look closely at your MW door glass, its got tiny holes in a metal shield inside the glass. You can not get a pencil through those holes, so you are safe to watch you pasta explode inside MW. If you put something inside a container with ‘small’ holes the waves can not get to the device, so use small hole screens in a continuous wrap so the waves are caught by the screen and dissipate harmlessly(since it only takes a microsecond to fry everything).
      Got it?

  2. It still isn’t clear to us. Did you post an update somewhere? Another question: How will an EMP/solar flare affect solar panels and their accompanying electrical components, i.e., the charge controller, the inverter, etc.? These items all use electronic circuitry. Another question: How will EMP/solar flare affect all the vehicles with all their related electronics? Another question: Am I correct in assuming that car batteries won’t be affected by EMP/solar flares? Thanks for the info you’ve given so far. It makes me think quite a bit about what will be affected. Has any scientific study been done to date on the EMP/solar flare effects/remedies and can you give references?

  3. Will EMP’s affect People with a pacemaker? Could it be fatal? Can anything be done to shield a person with a pacemaker from the effects of an EMP?

  4. Here’s my main concern as I already have spare electronic devices (laptop, phone, two-way radios, CB, shortwave radio, and hand-held ham sets) stashed away in a faraday box. HOWEVER…my gun safe has an electronic keypad operated by a 9v battery and I’d hate to be permanently locked out of it. Any suggestions? I’m sure others have the same type of gun safe with the same concerns.

    1. The keypad may be fried and that would be a problem. I have a safe that has an electric keypad BUT it also has a manual key that can be used in case of an EMP.

  5. Regarding Robert Zigler’s questions of October 13, 2017, I also have a pacemaker (implanted in 2014) and have wondered, in the case of an EMP attack, what happens to the battery inside the pacemaker. Are people who wear pacemakers doomed or can there be some way to protect or shield a person with a pacemaker? What about a vest like those worn by people getting X-rays, would these work? I have also wondered about going to the hospital 2 miles up the road and hang out in their cancer radiation chamber except it has an electronic keyboard and I wouldn’t want to get locked up inside with no way out. I’m sure others have the same concerns.

  6. The problem here is that two very different actions are being grouped together. A HEMP caused by nuclear weapons will result in three types of pulses, the first or P1 is nano-seconds in duration but very intense, up to 50kV/m this rise time results in huge induced voltages and is what effects electronics, whether that are plugged in, battery operated or just sitting on the shelf. This is what a faraday cage protects you from. The second pulse is like lightening and lasts as long as the fireball from the device, only the lightening is striking everywhere at once. Surge protectors, if the P1 pulse didn’t fry them will protect most equipment. The third pulse is a longterm ground induced current and will come in through ground lines, hence, don’t ground your faraday cages. This is what caused powerline damage during the Russian K tests.
    A CME has similar effects of the p2 and p3 pulses but lacks the p1 component. Hence, things hooked up to power or grounds that don’t use surge protectors and ground fault isolators may fry, and things with long conductors such as antennas, but battery powered things, cars, offline generators, etc. should be fine.

  7. Why do you use the term Faraday Box instead of Faraday Cage? A cage can be whole room sized.
    Also, lightning DOES produce EMP’s. That’s what the flash is and also the crackle on your AM radios. It is broad across the whole electromagnetic spectrum It can induce currents in micro electronics that will fry the semiconductors. I have experience. Lightning hit a nearby tree and fried the audio side of my large crt television (in a plastic case) and spared my stereo in a metal case.

  8. What a container work as a faraday cage also is there any way to ground or protect farm tractors or equipment like Bobcats and bulldozers

  9. I am thinking of building an underground shelter. Is there anything that the cement can be sprayed with on thee inside of the cube made of cement that will create a faraday cage that would protect all things inside it as long as the door were also a conductor and makes contact with the metallic coating?

  10. Also a cardboard lined barrel with lid works well. I also keep electronics, red dots etc. in original boxes –
    styrofoam packing with “shielding bags”. Put that into a shipping container and multiply your protection.
    Idea # 2 from the TV series “Jericho” wait a while before bringing out the goodies. Double-tap possible.
    David carried five stones – Goliath had brothers

  11. Long-term storage of electronic equipment can result in failure of some components if they aren’t used and refreshed occasionally. Also, batteries, especially rechargeable ones, will sour and weaken if not maintained.
    So don’t just keep your stuff in a cage and forget it.

  12. I would like to hear the answers to all of the questions posed above, perhaps a paragraph addressing each in a follow up article. I also would like to know if a modern diesel farm tractor (2010 or newer) would have the same, less or better survival chance than one from the 80s or 90s?

  13. I was going to order life straws but it disappeared just as i was going to put in my info What happened?I can not find it again kjvolk

  14. All these comments are easy, and common sense is the best answer. The worst case would if one day they do the EMO drop, then wait until all the backup systems are going, then drop another one, say a week later. The best way around this is to have shielding around all the electronic gear, with all outside antennae, power cords, wiring from generators, etc. disconnected when not being used. If your radio gear is in a basement, one could put a layer of metal roofingover those devices so the edge of shield extends past the edge of ham transceiver. That provides a “zone of protection” similar to metal tower built next to a home. If the tower is 100 feet tall, then the zone would be 100 feet from that tower, protecting the home. Its sort of like a lighting rod atop the ridge line of a home. A very important idea is to physically disconnect the eq. from outside antennae, and power lines. Regarding the solar panel, place an adjustable lighting arrestor in the DC line just before it enters the control unit, and adjust the gap down to 1/100 th of an inch, with inline fuses rated at the solar panels output.

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