Ever break the circuit on high voltage ? Do you really understand what you get when it happens. ? I can tell you with absolute fact and it is something you can prove your self. while your engine is running pull a spark plug wire . if you dare . this is a process that has been operating since the engine was invented. I have seen arcs over a foot long trying to disconnect from the source on high voltage lines ,it is frightening if you are very close to it. metal is melting and snapping like a grease fire ablaze. Do you know what lightening is , an arc of electricity . I worked for a major ski area ,ad they had tried every thing in the word to protect their communications and electrical system from the effects of lightening strike and NOTHING CAN SWITCH OFF FAST ENOUGH . If there is the possibility of lightening, the system is shut down manually till the danger is past, with a switch that not only opens the circuit but puts a block in the way . Any ground will attract an electrical surge, other wise nothing electric would work . one wire supplies the energy one wire is the ground and the work is what is between be it a light bulb or a motor .Break that circuit in motion and you will get an arc, the higher the voltage the greater the arc. Unlike when the first CME hit, our homes are covered in wire, regardless of the wire and steel surrounding us now days .like a giant antenna . all grounded like a lightening rod. Lightening rods ATTRACT lightening in an effort to distract lightening from the structures near it . Now we are looking at a very small switch , that has a circuit smaller than the distance of a spark plug gap.
MOVs just short circuit the over voltage they are very fast acting because they are always on. Just not made to take the energy of a lightning hit. There's also lightning arrestors like are used on electric fences. I have considered adding lightning arrestors to the service drop, MOVs inside the panels and MOVs inside most devices. I already have MOVs inside the panels and in large devices.
Lightning arrestors merely give a false sense of security from a direct strike. Stop and think for a second...lightning just jumped over twenty miles, a half-inch semiconductor is not going to stop it. They are designed to bleed off induced voltage from nearby strikes.
As far as Lightning I read a white paper on an even worse event that relates to my area. If you live where the power line dead ends on the stretch you draw power from then in the event of a strike the charge will travel to the end of the line and fold back on its self and hit you twice! I found this write up while researching a false surge that knocked out some equipment with a properly wired system and conduit grounds This affected our cooling tower fans in Houston. The Allen Bradly drive controllers would sense an over current with the right type lighting even if it did not hit our building. We Solved the problem with independent ground leads to all cooling towers and associated equipment even though we had full building (10 story building) ground system and of course ground leads in the wiring and conduit. EMP will be much worse so just kiss anything hooked up good bye.
For post EMP comm these might be a better investment. One is limited only by your runners endurance, the other I've talked on (well, talked LOUDLY without external power) over two miles of slash wire.
Looks as if he got a PR/Madison Ave Add Group on line with a lot of flash and bang to sell his product. Now lets see some real High Voltage test.
EMPStorm™ – Practical Disaster Preparedness for the Family There are a couple update videos if interested
For a few reasons. We know well in advance when a solar storm is headed our way. Solar storms induce fractions of a volt per mile onto conductors so the power grid will absorb huge amounts of energy from the energized atmosphere. Your house has maybe a mile of wire in it so when you disconnect from the power grid you might build up a half volt, which can't do anything. When appliances are subjected to over voltage and transient line voltages they tend to fry. Then they can start a fire and burn your house down. Removing the power meter disconnects you from the power grid. Some people say just turn off the brrakers. Well that's fine but if the power meter it's self catches on fire you are screwed.