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Lightning
On Aug 20, 7:57 pm, Vic Smith wrote:
On Wed, 20 Aug 2008 19:38:50 -0400, "Eisboch" wrote: wrote in message .. . I am always curious about how a boat takes a hit but I do have some experience with a lightning rod. I put a 3' copper rod over my weather station with a pointy stainless steel tip, connected to 2ga copper wire and terminated in a ground rod (connected to my extensive house grounding system) It has been hit twice that I know of and I was about 30' away during one of them. A mexican laborer was pretty much under it, plastered against my garage door. Other than the poop reflex we were totally unaffected.. The steel garage door he was plastered to is bonded to the same grounding system as the lightning rod as is the wet concrete driveway I was standing on. We were fine. The weather station ... not so much ... either time. Our house has a copper clad cupula, grounded to two metal rods located near the house power panels. It's been hit at least three times. Once, the driveway (near the metal rods) snapped, crackled and popped for about 5 seconds following the hit as the energy was absorbed by the ground plane. Originally, it also had a big, copper weather vane. That has long since been vaporized. Fine for a house .... not so fine for a boat. Eisboch This is the best thing I've seen on lightning, and think it pretty well hits the mark on what you can do on a boat. It's geared toward sailboats, but the principles are there. For electronics gear, I would do the same as I do at home with my computer and other electronic gear if I anticipate lightning: unplug it. An insulated non-conducting case might be appropriate for a radio when at sea.http://edis.ifas.ufl.edu/pdffiles/SG/SG07100.pdf --Vic That is a good article. Thanks |
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