An enclosed metal structure is ideal for protection of electronic systems against an EMP attack (or a natural EMP occurrence from the sun). An ideal Faraday cage is enclosed in metal conductive material on ALL (6) sides, including the floor.
If the nearest FM broadcast transmitter cannot be received on the car radio with the doors closed, it is a pretty good bet the structure will provide some protection. The problem may be the windows – an EMP will still get in through the windows, unless you have metal screens. This concentration of EMP by metal wiring is one reason that most electrical equipment and telephones would be destroyed by the electrical surge. That said, there are some methods which will help to protect circuits from EMP and give you an edge if you must operate ham radios or the like when a nuclear attack occurs. A new device which may soon be on the market holds promise in allowing electronic equipment to be EMP hardened. At the other end of the scale of EMP resistance are some really sensitive electrical parts.
The only two requirements for protection with a Faraday box are:(1) the equipment inside the box does NOT touch the metal container (plastic, wadded paper, or cardboard can all be used to insulate it from the metal) and (2) the metal shield is continuous without any gaps between pieces or extra-large holes in it. The thickness of the metal shield around the Faraday box isn’t of much concern, either. Although many parts of the vehicle are enclosed to a large degree, a problem is that most cars today have a-lot of plastic instead of metal on their enclosures, and would not prevent all EMP from getting in.
In such a case, the gamma radiation released during the flash cycle of the weapon would react with the upper layer of the earth’s atmosphere and strip electrons free from the air molecules, producing electromagnetic radiation similar to broad-band radio waves (10 kHz-100 MHz) in the process.
It’s believed that the electrical surge of the EMP from such an explosion would be strong enough to knock out much of the civilian electrical equipment over the whole country. This short stretch of metal puts the device within the troughs of the nuclear-generated EMP wave and will keep the equipment from getting a damaging concentration of electrons.

The trick is that it must REALLY be hardened from the real thing, not just EMP-proof on paper. Despite what you may have read or heard, these boxes do NOT have to be air- tight due to the long wave length of EMP; boxes can be made of wire screen or other porous metal. Grounding a Faraday box is NOT necessary and in some cases actually may be less than ideal.
The very prudent may wish to buy spare electronic ignition parts and keep them a car truck (perhaps inside a Faraday box). Unfortunately, a little-known Federal dictum prohibits the NRC from requiring power plants to withstand the effects of a nuclear war. Below is a detailed write up about EMP (Electro-Magnetic Pulse) and how to protect yourself from it.
Adding to the problems is the fact that its effects are hard to predict; even electronics designers have to test their equipment in powerful EMP simulators before they can be sure it is really capable of with standing the effect. Protecting electrical equipment is simple if it can be unplugged from AC outlets, phone systems, or long antennas.
These design elements can eliminate the chance an EMP surge from power lines or long antennas damaging your equipment. The Ovonic threshold device is a solid-state switch capable of quickly opening a path to ground when a circuit receives a massive surge of EMP. These might even survive a massive surge of EMP and would likely to survive if a few of the above precautions were taking in their design and deployment. If you have electrical equipment with such com- ponents, it must be very well protected if it is to survive EMP. If the object placed in the box is insulated from the inside surface of the box, it will not be effected by the EMP traveling around the outside metal surface of the box. Ideally the floor is then covered with a false floor of wood or with heavy carpeting to insulate everything and everyone inside from the shield (and EMP).

According to sources working at Oak Ridge National Laboratory, cars have proven to be resistant to EMP in actual tests using nuclear weapons as well as during more recent tests (with newer cars) with the US Military’s EMP simulators. This means that, in the event of a nuclear war, many nuclear reactors’ control systems might will be damaged by an EMP surge. Once you understand EMP, you can take a few simple precautions to protect yourself and equipment from it. Thus, strategies based on using lightning arrestors or lightning-rod grounding techniques are destined to failure in protecting equipment from EMP.
Another useful strategy is to use grounding wires for each separate instrument which is coupled into a system so that EMP has more paths to take in grounding itself. It is important to note that cars are NOT 100 percent EMP proof; some cars will most certainly be effected, especially those with fiberglass bodies or located near large stretches of metal. Nuclear bursts close to the ground are dampened by the earth so that EMP effects are more or less confined to the region of the blast and heat wave. EMP, like nuclear blasts and fallout, can be survived if you have the know how and take a few precautions before hand. But EMP becomes more pronounced and wide spread as the size and altitude of a nuclear blast is increased since the ground; of these two, altitude is the quickest way to produce greater EMP effects. Ammunition, mines, grenades and the like in large quantities might be prone to damage or explosion by EMP, but in general aren’t all that sensitive to EMP.
Consequently, storage of equipment in Faraday boxes on wooden shelves or the like does NOT require that everything be grounded.

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