How Do You Protect Against An EMP?
You're going to need a lot more metal!
Electromagnetic Pulse Bomb protection is a problematic field of study, because even if you can protect your cellphone, car, and home from a pulse, the electric grid, cellphone towers, and transportation system will still fail, along with every other car on the highway. Consider that in an instant every car that is not protected will stop running unless it was built before the 1970s. All those cars will clog up the highways and streets until someone physically pushes them into parking lots. All the traffic lights will be down, and every embedded phone and communications system will be fried. Unless you have well water, the city water supply, pumped by electricity from the power grid, will fail. If you have a pacemaker, it will work if you were in a shielded area, but only as long as its battery. Therefore, protection against Electromagnetic Pulse Bomb threats is possible, since all you have to do is create metal shielding around small components or keep everything is a well-sealed quonset hut, but the whole thing may be pointless. A better way to protect against EMP bomb threats is to study Amish farming and living methods, since they require zero electricity.
A little-known way to prepare involves the preservation of classic automobiles that don't use electronic ignition modules. Any car that doesn't use transistors to keep the engine running would be very useful in a crisis. Automobiles from the 1950s and 1960s may be the only things running after an EMP. However, this means that they should be in working condition, not rotting in your yard.
When considering what to put in your EMP cache think of disaster radios that can be powered by winding them up, GPS devices, and blood monitoring tools if you are diabetic. The scope of your cache will change whether you have a metal box or an encased room. Another strategy may be to keep old-time radios that use tubes, with the caveat that an EMP can still short out anything with a long enough cord.
Notes and Special Information
Special note: Prevention may be more valuable than protection, since most consumer electronics are also useless while they're inside a Faraday cage.