EMP Prep, What would you do if you had 45 minutes to prepare?
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mbohuntr
Platinum Member
Sorry... here in the US, our AC is generated at 60hertz, or.. oscillates positive to negative 60 times per second. One cycle = 1/60, or .017 milliseconds.
k0ua
Epic Contributor
What he probably wants to know is what did you mean most breakers are 4 cycles? As in they can open within 4 cycles of the waveform? or 4/60th of a second? Is that what you meant? The opening time of the breaker itself?
CalG
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Reading along with this thread, ...
If I had 45 minutes, and so did everyone else, I would run the water into the tub and fill all available containers, as the well is a couple hundred feet deep. I don't trust the stream, a beaver may have shat in it.
Then I would retire to the den and arrange what stores of ammo I have on hand. Then I would wait to observe what changes are evident today, tomorrow and next week. I would walk over the my neighbor Bill and we might share a "wee dram". I have cooking gas enough for nearly a year (depending) ;-)
Can you drink swimming pool water after boiling? I think so ;-)
If I had 45 minutes, and so did everyone else, I would run the water into the tub and fill all available containers, as the well is a couple hundred feet deep. I don't trust the stream, a beaver may have shat in it.
Then I would retire to the den and arrange what stores of ammo I have on hand. Then I would wait to observe what changes are evident today, tomorrow and next week. I would walk over the my neighbor Bill and we might share a "wee dram". I have cooking gas enough for nearly a year (depending) ;-)
Can you drink swimming pool water after boiling? I think so ;-)
mbohuntr
Platinum Member
Yes, the time it takes the breaker to open.
/pine
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45 minutes is not going to be enough time for anyone that has not already taken measures to do much of anything that will do any good...
This thread is in the 'Rural Living' forum so on the guise that many rural homes are on wells rather than municipal water systems...And since a human can only survive 3-5 days without water...I'd say it's one of the more important things in disruptive situations...
Hand pumps...without power, moving liquids like fuel and water will require hand pumps...folks with wells can install stationary hand pumps...hand pumps should be checked out as often as genny check runs...but nobody is going to get it done in 45 minutes...Take it from the boy scouts and "be prepared"...
This thread is in the 'Rural Living' forum so on the guise that many rural homes are on wells rather than municipal water systems...And since a human can only survive 3-5 days without water...I'd say it's one of the more important things in disruptive situations...
Hand pumps...without power, moving liquids like fuel and water will require hand pumps...folks with wells can install stationary hand pumps...hand pumps should be checked out as often as genny check runs...but nobody is going to get it done in 45 minutes...Take it from the boy scouts and "be prepared"...
Sigarms
Super Member
And THIS is why the forefathers of the United States could see the potential abuse of any government in power, and thus the reason why we have the second amendment.
In my previous job I worked on EMP tolerant designs. There are two major issues. First is the power grid. Not my area of work, but I had to be familiar with it. The problem there is that current induced in long(er) power lines will cause saturation of magnetic devices, like transformers, generators, etc. The saturation will result in very high peak currents which will cause severe damage to some of them. The issue becomes the fact that replacements can take many months, or even years to replace. Multi-megawatt transformers, switchgear and generators are not on the shelf.
As for electronics, EMP has a unique effect. It does not destroy the devices per-se, but rather it causes every semiconductor junction to conduct, or turn-on. The effect is not permanent, but diodes will conduct current in both directions, all transistors will "turn on" and solid state surge protection devices will conduct. This can cause circuits to fail due to all of the unintended conduction paths. If the electronic device is not powered, no problem. Tolerant designs use shielding (faraday) or the design is such that it can tolerate the momentary conduction of all of the solid state devices. Some solid state devices are reasonably immune to the effect. These are known as SOS, silicon-on-saphire. They are very expensive and only used in military electronics and for satellite electronics where solar flairs can cause the same problems.
Interesting is that the Soviets used vacuum tube technology in military gear (MIG 25 radar example) for a few decades after the west as tubes are minimally effected by EMP and designs with tubes are much easier to design to tolerate EMP induced currents.
Paul
As for electronics, EMP has a unique effect. It does not destroy the devices per-se, but rather it causes every semiconductor junction to conduct, or turn-on. The effect is not permanent, but diodes will conduct current in both directions, all transistors will "turn on" and solid state surge protection devices will conduct. This can cause circuits to fail due to all of the unintended conduction paths. If the electronic device is not powered, no problem. Tolerant designs use shielding (faraday) or the design is such that it can tolerate the momentary conduction of all of the solid state devices. Some solid state devices are reasonably immune to the effect. These are known as SOS, silicon-on-saphire. They are very expensive and only used in military electronics and for satellite electronics where solar flairs can cause the same problems.
Interesting is that the Soviets used vacuum tube technology in military gear (MIG 25 radar example) for a few decades after the west as tubes are minimally effected by EMP and designs with tubes are much easier to design to tolerate EMP induced currents.
Paul
Sigarms
Super Member
Courtesy of Victor Belenko. Getting old, I remember when it happened.