On 9/27/13 10:51 PM, Grant Saviers wrote:
If it is lightning protection and not RFI shielding that is desired,
then what is done for explosive magazines ought to be enough!
http://www.seftim.fr/publications/DDESB/17-3-LIGHTNING_PROTECTION_FOR_CRITICAL_EXPLOSIVES_OPERATIONS.pdf
has many references, but there are older documents I've seen in prior
google searches. e.g. http://www.apd.army.mil/pdffiles/p385_64.pdf Or
standards for protection of petroleum storage facilities.
There's also a nice report out from Lawrence Livermore on storage
shelters for nuclear weapons and high explosives, which includes some
test data.
But realistically, it doesn't take much to lightning protect a single
room. The real challenge is preventing the transient EM field from
propagating.
I would also think that foil is a bad choice as a conductor should you
have a strike when #2 or larger is what is commonly used in large
structures frequently hit.
AWG #2 is used for mechanical ruggedness, not current carrying capacity.
Lighting strokes are high current, but short duration, so a surprisingly
small wire will carry the current without melting.
There are very large mechanical forces on the wire from the magnetic
fields from the stroke current, though.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|