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Tool Talk Discussion Forum

Lightning Rods

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Farmall Don

12-27-2006 14:50:08




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The last few years I have had two trees in the yard struck by lightening. Therefore I was planning on getting some lightning rods on the barn and possibly the house. The house has surge protection, but no rods. Anyway, my father in-law keeps telling me I"m waisting my money and it will hit where it wants. I wanted your opinions.
Thanks




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Brian in MO

12-28-2006 18:23:24




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 Re: Lightning Rods in reply to Farmall Don, 12-27-2006 14:50:08  
Don lightening rods do work. I don't know any of the technical reasons and I'm sure these other guys are right about them, but I will say I have worked (as a equipment operator not electrician!) on a couple of power plants built by Ameron UE the go crazy over their lightening protection and you better not cut a ground wire when you dig around their ground loops even if the sun is shinning they have to be fixed now! I don't think a company like that would spend so much on something that don't work. Just my 2cents Brian.

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kidbob

12-27-2006 21:15:01




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 Re: Lightning Rods in reply to Farmall Don, 12-27-2006 14:50:08  
It is not possible for a small cable to carry the energy of a lightning bolt.
The rods work for two reasons, they must be connected to a good ground and the highest point, and the point is critical, the voltage required to jump into the air is controlled by the radius of the point, thus a very sharp point allows the charge to be drained from the air at a very much lower voltage than most objects. That is why a vandergraph ball is round, to get the voltage higher before it jumps.

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John T

12-27-2006 19:43:01




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 Re: Lightning Rods in reply to Farmall Don, 12-27-2006 14:50:08  
Don, Welllll l what your father says bears some degree of truth, it will hit where it wants buttttt ttttt ttt why not make it hit where it wants PLUS you prefer it to also i.e. discharge and dissipate the energy via your Lightning Rod system versus letting your house do it and burn it down in the process????? ?????

Think about it and ask him that lol

When that storm cloud passes overhead and is composed of accumulated electrons having a charge opposite that from mother earth, a good n proper lighting rod system allows that energy to be discharged such that it doesnt discharge through the house.

THEY DO INDEED WORK ITS A MATTER OF PHYSICS AND ELECTRICITY AND CONSERVATION OF ENERGY.....

You wanna talk static discharge and lighting protection, you ought to see where I used to work as a design enginner at an expolosives ordnance facility. We had primary and secondary ground loops and long tall towers and lightning rods till who tied the pup, THEY DO WORK.

Its your house and your money and your choice n your call but all I can tell you is if installed properly they can indeed help prevent a house from being struck by lightning by discharging and dissipating the energy back to mother earth versus to mother earth via your house.

John T Retired Electrical Engineer

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jake 2

12-27-2006 17:31:46




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 Re: Lightning Rods in reply to Farmall Don, 12-27-2006 14:50:08  
OK, here�s the rules. Not mine�Natures rules. You don�t install lightning rods to attract the lightning to ground, but to make the structure appear not to be there, to the lightning

Lightning or more properly, electrons travel from negative to positive. The more negative you make the roof of your house, barn etc. appear to the lightning, the less likely it is to be struck. That�s why properly installed aluminum siding should be grounded.

If you chose to install lightning rods, make sure you run a good stout ground cable to a good copper or copper coated ground rod (Min. 8 foot) and properly clamped. This way, the house looks more negative to the negative lightning charge than something else, say a tree, and the tree (being more positive) will probably be struck and not the house.

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ErnieDD

12-27-2006 15:05:35




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 Re: Lightning Rods in reply to Farmall Don, 12-27-2006 14:50:08  
Lighting seeks the path of lowest resistance. The trees served to "protect" the surrounding area. Our farm was hit by lightning on the power line, which was grounded on the same ground rod as the telephone. I was making a phone call and came too on my knees in the stable. Water heater, TV, well pump, telephone were all kaput.

Dad had lightning rods put on the house so he could sleep better. House was ringed with tall maples, they have never been hit.

Guess it depends on how many electric storms are in your area.

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Ozlander

12-27-2006 20:14:49




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 Re: Lightning Rods in reply to KEB, 12-27-2006 19:52:51  
Keith got it right.
He said "Lightning Technologies Inc" which means he's BTDT.

Ozlander



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Ozlander

12-27-2006 20:11:30




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 Re: Lightning Rods in reply to KEB, 12-27-2006 19:52:51  
Keith got it right.
He said "Lightning Technologies Inc" which means he's BTDT.

Ozlander



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rustyj14

12-30-2006 07:35:44




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 Re: Lightning Rods in reply to Ozlander, 12-27-2006 20:11:30  
When the CB radio thing was in high vogue, we had a CB base station, with a large CB outside antenna clamped to our brick chimney. Our home is on one of the highest hills in our area, sits at the edge of a wooded area. So, when my FIL got too sick to live by himself, we added an addition to the side of the house where the chimney it. Unbeknownst to me, the contractor cut the heavy ground wire from the antenna, and went on building the addition. Of course, he never said anything about that action. Didn't take very long until the first electrical storm resulted in the chimney being hit, knocking out a few bricks. The chimney took some more hits, so i decided to ask an electrician friend about it. He told me just what has been said here, so i soon took down that antenna, and have had no more problems with chimney nor house strikes! Rustyj

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