Re: Thunderbolt and lightning, very, very frightening me
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?Allison --- thanks, that is GREAT information.....
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I've worked with shelters and all for land mobile.? They are ringed underground with rods and wires,
same with surfaces and corners and then everything that goes into teh building is though a copper
plate with with polyphasor or similar before it geto to anything inside. IT's bonded to the tower with
copper straps usually wide like 4 to 6 inches and more than one.? They can take a direct hit.
Many years before a AM BC station.? You have the filed with the 120 wire ground plane,
ground rods most 12ft abound.? Tower is up on insulators for base feed but thereis an
arc gap from each leg spaced maybe 3 inches? the feed sire goes to the load coil in the
doghouse next to the base and that has straps to ground for RF and sparks.? ?The feed lines
are arranged to arc ro ground before the TX shed.? Been there during a storm, the
sparks are impressive and frightening.? About 1 in 10 caused the big 5kw RCA to shut down
usually a reset of breakers was all it took to start running the heaters(tubes) then B+ and
the modulator.? About twice a year the power company feed was a problem so we were
1KW off genset backup.
Me I've gotten hit twice one direct to the house antenna, fried the #6 wire to BBs and
much of the electronics in the house.? Second time it hit a pole down the hill before
it went underground about a mile away the surge got me, mostly minor.
The big thing is to protect so two things happen.? You do not burn the house down.
Your insurance then will cover any damage (or they do their best to weasel out).
Complying with NEC code is more for the prevention of insurance issues.
Call me pragmatic.? Prepare for the worst be, happy if it doesn't happen.
Allison
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