Re: nuclear EMP protection???

From: Activ8 (reply2group_at_ndbbm.net)
Date: 06/04/04 

Date: Thu, 3 Jun 2004 23:49:12 -0400

On Thu, 3 Jun 2004 23:11:37 -0400, Robert Morein wrote:

> "Activ8" <reply2group@ndbbm.net> wrote in message
> news:1g5xk3jkm8xjv.dlg@news.individual.net...
>> On Thu, 3 Jun 2004 20:36:23 -0400, Robert Morein wrote:
>>
> [snip]
>> All I had to do was google EMP and I got more than enough info
>> --
>> Best Regards,
>> Mike
>
> I did, but I found no hard info on the shape and duration of powerline
> disturbances.
> Is it DC? Is it ringwave? Peak voltage?
>
> These things matter.

I don't recall finding that, but I did find out that a Radioshack
bulk tape eraser was a good way to test an enclosure. I also found a
copy of the Army Corp of Engineers plans for secure comms
enclosures.

So if you find that article or the Gauss of the eraser, and the
pulse duration (I'd suggest googling on nuclear blasts, too) you can
do a little math to get an idea of the magnitude of the disturbance
and pick a supressor.

I think a little more googling will get you the info you need. I
found thids much in 1 min

"As it travels into a facility, a transient changes forms ¡X due to
the impedance of the wiring and transformers ¡X from an impulse-type
event to a ringwave-type event. The natural inductance and
resistance of the wiring infrastructure will create a typical
ringwave event of 100 kHz. This is why you can use much smaller
components at a wall outlet or surge plug strip than what you would
use at a panelboard or service entrance. You see much lower surge
currents at the downstream locations." 

-- 
Best Regards,
Mike