Interesting but scary subject for me ! I hope we don't find out how
well they work !
The MidNite SPDs use MOVs with a rating of 15 nano-second response time.
This response time is in line for type 2 and 3 EMP events but your
mileage may vary.
Type 1 EMPs (pico-seconds ?) have faster rise and fall times so will
fall outside those specifications but
might help ? I don't know. Up here in the pacific northwest, Boeing
actually has an
EMP test facility for military aircraft and equipment... It is very
expensive to book
time there I am told by my brother Robin, who has submitted equipment to
in a past
life and work-place.
EMPs are kind of like lightning in that the field strength will vary
depending on
distance from and strength of the source as well as how much the wires
connecting your
equipment to the outside world act as antennas.... Like a lightning
strike, results may just be
luck of the draw, especially if it were to be like a direct hit and
short rise/fall times.
I would guess that wire length (resonance) may have a effect on how
well they act as an antenna for
a given pulse width for lightning or an EMP ?
Faraday cages may not help at all unless they are used for storing spare
equipment and with NO wires
exiting and entering. Ferrites connected as common mode filtering (all
wires passing through) may
or may not help on external wiring either.
If an EMP does occur, I would replace the SPDs with new ones to be safe
for the next one...
And do not hesitate to give us a call and tell us how well it worked !
You might need to leave
a message though as we will probably be very busy at that time.
boB, at SPI in Vegas
On 9/9/2017 4:22 PM, drake.chamber...@redwoodalliance.org wrote:
How about using a solid metal enclosure instead of a mesh? Would that
cover frequency differences?
One thing railroad tracks and telegraph wires have in common is that
they are very long metallic conductors. The charged particles cut
across the conductors for extended distances, That situation would be
similar with a grid connected inverter.
If the inverter were isolated from the grid, with the breakers turned
off (or removed), maybe that would help, depending on the magnitude of
the pulse.
The electronics would need to be isolated from the grounded,
conductive cover of the enclosure. The equipment should be isolated by
design with neutral and ground separate.
Would a Midnite surge protector be of any help in an EMP event?
Thanks,
Drake
----- Original Message -----
From:
"RE-wrenches" <re-wrenches@lists.re-wrenches.org>
To:
"RE-wrenches" <re-wrenches@lists.re-wrenches.org>
Cc:
Sent:
Fri, 8 Sep 2017 14:56:37 -0400
Subject:
Re: [RE-wrenches] EMP - Faraday Cages
Spent a little time over the last few years trying to study this,
there is dozens of answers to the same question it seems if you
surround it with mesh it depends on the spaces size in the mesh
and it also depends on the frequency of the EMP
I would not bet that just putting a disconnect in the wires would
help but lightning is capable of jumping miles across the sky I
can't imagine that an emp would be any different I'm sure it could
bridge a gap the size of a breaker or disconnect relatively easily.
During the Carrington event in the 1800s it was setting railroad
ties on fire as well as burning down telegraph offices
I'm afraid the best bet would be a back up inverter and controller
properly wrapped and shielded and make the sign of the cross and
pray for the best !
And if it's atmospheric like a solar pulse or other challenge you
would want to wait several days before you brought out your back
up stuff because you may get hit again in a matter of hours or
days and it be a shame to get everything possibly working again
and have it wiped out by the 2nd hit
I'm probably already outside of what Michael would like me to be
so we can continue later if you like
Bob ellison
On Sep 8, 2017, at 12:22 PM, drake.chamber...@redwoodalliance.org
<mailto:drake.chamber...@redwoodalliance.org> wrote:
In 2013 we were having a discussion of Faraday cages. I don't
think we ever got an answer to the question of whether a
grounded inverter or charge control enclosure would serve as a
Faraday cage? If all external lines were disconnected, would
the grounded metal enclosure prevent damage from an EMP?
Thanks,
Drake
Chris Daum
<https://www.mail-archive.com/search?l=re-wrenches@lists.re-wrenches.org&q=from:%22Chris+Daum%22>
Tue, 07 May 2013 12:21:16 -0700
<https://www.mail-archive.com/search?l=re-wrenches@lists.re-wrenches.org&q=date:20130507>
Dear people:
So I have a customer worried about the end of the world as we know it.
I've
looked at the HP archives and see comments from a while ago. Other than
screening/boxing components and adding mucho surge protectors, is there
anything else that can be done that might actually work?
Thanks!
Chris Daum
Oasis Montana Inc
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