Posted by jackinok on August 02, 2012 at 19:39:08 from (68.235.156.85):
In Reply to: O/T lightening rods posted by Notjustair on August 02, 2012 at 16:58:31:
All our buildings have them at work,along with a 4/0 copper cable buried all around the buildings in bentonite/clay mix,1" ground rod every 25 ft or so cadwelded (not clamped) to it. Wires running down from lightning rods are 4/0 tinned and braided copper,one from each rod independently and again cadwelded at each end.(why would you spread a lighting strike out accross your roof?) FAA engineers are believers,and they go to great length to protect from lightning. Consider this, a airport and its support systems can litraly strectch for miles,a lighning strike any where on that system can in theory shut down a entire airport.The current thinking is this,when lightning charge builds up,,the field it charges up is like a cone,wider at the top,smaller at the bottom.Generally this charge builds up in a circle of about 20feet accross at he ground.Within that circle the tallest point is the one most likely to be hit,not the tallest structure in the area.If it were just a matter of being the tallest,you could protect from lightning simply by putting up a tower on your place anywhere taller than your existing structures. Most of the time lightning DOES NOT hit the tallest structure in the area,it simply hits the tallest structure in that small area where the charge is greatest. Lightning rods DO work,and properly installed they will protect your property. Power companies and things use lighning arrestors and things.But they are few.Trees do the greatest damage to overhead systems.This is one of the biggest problems with under ground power systems,if lightning hits a transformer,all the wire connecting it to the grid often has to be replaced,at a huge cost. Its not snake oil,its simply a protection device IF lighning ever does hit your home.It simply gives it a closer path to ground.it doesnt attract lightning,if we could attract lightning we would be well on our way to solving our power problems.It simply is a safety device.They are installed in case lightning hits ,not to make lightning hit.
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