Archive for February, 2011


The general understanding bout lightning protection system for building structure is confined to provision  a direct strike lightning air terminal, down conductor and earth terminal.

lightning protection  system for building and other associated structure is complete with the following:

1) lightning direct strike air terminal; rods, horizontal copper tape and strip to form mesh or grid like terminal place at roof top.

2) down conductor; the conductor with the purpose to conduct the lightning energy to the ground once the building are struck by lightning.

3) earth terminal; an interface joining the above the ground LPS with the general mass of earth so that there is a solid bond between the LPS with the soil.

4) the equal potential bonding system serve the purpose of making very point of system at the same potential under transient over voltage condition.

5) proper placement and coordination of secondary surge protectors so that at very point on the electrical system, surge protector are installed.

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A lightning rod or lightning conductor is a metal rod or conductor mounted on top of a building and electrically connected to the ground through a wire, to protect the building in the event of lightning. If lightning strikes the building it will preferentially strike the rod, and be conducted harmlessly to ground through the wire, instead of passing through the building, where it could start a fire or cause electrocution. A lightning rod is a single component in a lightning protection system. In addition to rods placed at regular intervals on the highest portions of a structure, a lightning protection system typically includes a rooftop network of conductors, multiple conductive paths from the roof to the ground, bonding connections to metallic objects within the structure and a grounding network. The rooftop lightning rod is a metal strip or rod, usually of copper or aluminum. Lightning protection systems are installed on structures, trees, monuments, bridges or water vessels to protect from lightning damage. Individual lightning rods are sometimes called finials, air terminals or strike termination devices. The lightning rod was invented by Benjamin Franklin in the Americas in 1749 and, perhaps independently, by Prokop Diviš in Europe in 1754.

pic a is the structure of franklin rod connection and in pic b one rod is illustrated after hit by lightning stroke.

the effect of Franklin rod to protect of Dubai Tower.

Stroke of lightning

Posted: February 10, 2011 in Videos

I suggest you don’t miss this video it is one of the best one which i seen till now. in the first part the arc will play by slow motion which can determine that how its head will reach to the earth. on the other part of move one lightning will  hit to the camera man but fortunetelling he will stay alive. in the last minutes of move hitting the lighting in the power system equipment is shown. watch it and keep it in your mind.


— Check for injuries. A person who has been struck by lightning does not carry an electrical charge that can shock other people.
— Provide first aid and call 911 immediately.
— Look for burns where lightning entered and exited the body. If the strike caused the victim’s breathing to stop, give cardiopulmonary resuscitation (CPR) until medical professionals arrive and take over.

what we should do when lightnings comes

Posted: February 10, 2011 in Papers

Seek safe shelter immediately! If you’re unable to find shelter in a building or residence that is equipped with a lightning protection system, the Lightning Protection Institute suggests the following guidelines:
Indoors
• Stand away from windows, doors, and electrical appliances.
• Unplug appliances well before a storm nears – never during because lightning can follow the wiring.
• Avoid contact with piping, including sinks, baths, and faucets because pipes can conduct electricity.
• Do not use the telephone except for emergencies. People have received severe electrical shocks while using the phone. Cell phones are not a problem.
Outdoors
Look for shelter equipped with a lightning protection system like those found at golf courses, public parks, and pools. If you’re caught outside and unprotected:
• Get in a hard-topped car.• Avoid areas that are higher than the surrounding landscape.
• Never use a tree as a shelter. (If in the woods, find an area protected by a clump of trees; never stand underneath a single tree in the open).
• Keep away from metal objects, including bikes, golf carts, fencing, and machinery, etc.
• Avoid standing near tall objects such as towers, tall trees, fences, telephone lines, or power lines.
• Immediately get out and away from pools, lakes, and other bodies of water.
• Spread out – don’t stand in a crowd of people.
• If you feel a tingling sensation or your hair stands on end, lightning may be about to strike! Immediately crouch down and cover your ears. Do not lie down or place you hands on the ground.
• Victims of lightning shock should be administered CPR and get medical attention.

 

lightning animation

Posted: February 1, 2011 in Pictures

it is a nice animation about how lightning stroke to the earth plus an inter-cloud lightning.

Advantages of Lightning

Posted: February 1, 2011 in Papers

There is a wrong believe and understanding about lightning. the most usual people think that the all things that lightning produce for us are unrighteous but it is not true there are some advantages and benefits from lightning for us when it occur. Lightning produces materials critical to life itself. All living things depend on the chemical element nitrogen. Your body contains molecules known as proteins. Proteins are made up of several elements, including nitrogen. Nitrogen is essential for proteins but it is very hard to make into proteins. Even though 78 percent of our atmosphere is made of nitrogen, we do not get any nitrogen from the air we breathe. We simply inhale and exhale the nitrogen without using it. The nitrogen in the air has three electron bonds between the atoms which is a very strong and stable chemical arrangement. It takes a great amount of energy to break these bonds to free nitrogen to make a protein.

When lightning slices through the atmosphere, it knocks electrons from the nitrogen atoms. The atoms are then free to combine with oxygen and hydrogen in the atmosphere forming nitrates. Rain carries this new compound to the earth enriching the soil with nitrates which are the building blocks of proteins. Plants synthesize these nitrates into proteins which can be used by animals and by us.

Without lightning and the other processes built into creation to process nitrogen, life could not exist. There is a purpose and design in lightning. The Designer has also given us the intelligence to avoid many of the negative side effects of this powerful force.

 

Lightning and airplane

Posted: February 1, 2011 in Videos

Contact of lightning surge to an airplane.

Lightning Clouds

Posted: February 1, 2011 in Papers

In-Cloud Lightning: The most common type, it travels between positive and negative charge centers within the thunderstorm.
Cloud-to-Ground Lightning: This is lightning that reaches from a thunderstorm cloud to the ground.
Cloud-to-Cloud Lightning: A rare event, it is lightning that travels from one cloud to another.
Sheet Lightning: This is lightning within a cloud that lights up the cloud like a sheet of light.
Ribbon Lightning: This is when a cloud-to-ground flash is blown sideways by the wind, making it appear as two identical bolts side by side.
Bead Lightning: Also called “chain lightning,” this is when the lightning bolt appears to be broken into fragments because of varying brightness or because parts of the bolt are covered by clouds.
Ball Lightning: Rarely seen, this is lightning in the form of a grapefruit-sized ball, which lasts only a few seconds.
Bolt from the blue: A lightning bolt from a distant thunderstorm, seeming to come out of the clear blue sky, but really from the top or edge of a thunderstorm a few miles away.