An EMP pulse is an EXTREMELY POWERFULwide band burst of radio waves.
Usually generated by nuclear explosions it can also be caused by the sun.
It hurts things by inducing high voltages WAY OVER the working limits of the equipment.
An EMP pulse is VERY short duration.Seconds rather than minutes.
EMP can “hurt things” if:-
- It’s an electrical or electronic design,
- It’s switched on or off,
- Connected to power or not,
- Assembled or in it’s separate parts,
- If it is outside a Faraday cage.
A Faraday cage is a metal box, all parts are bonded together, no holes.
Line it with a non conductive material like polystyrene sheet.
There is no need to bury or Earth this box.
Geo-Magnetic storms ARE NOT THE SAME AS AN EMP.
These induce high voltages in LONG wires like pylons, telephone wires, and aerials.
This is what kills power distribution and long distance communications.
These storms can last for hours if not days.
However as any large metal structures MAY become VERY electrically charged and start to arc and spark, prudence says to put your “home based gear” into a Faraday cage for the duration of the storm.
A Faraday cage will NOT protect sensitive equipment from strong magnetic forces.
Some electronic compasses have VERY sensitive magnetic devices in them.
Long range radio communication including land line telephones can be affected by these storms. Remember even if an underground cable is fiber optic, it eventually connects to something on the end of a wire and the longer that wire is, the more potential there is for disruption.
You can use mobile radio equipment for communicating i.e. handhelds and car radios BUT they may be swamped with naturally generated noise i.e. static, whistling, low frequency “rumbles”.