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Damn, How To Protect Houses And Buildings?

Damn, how to protect houses and buildings?

Lightning or lightning is the most spectacular atmospheric phenomenon offered by nature, but also the most terrifying phenomenon there is.


It can either damage equipment, and electrical installations, as well as kill people without wanting to directly hit them.

A natural phenomenon, lightning has been the target of folklore and popular beliefs and has frightened even the most intrepid human being by the bang he causes.
Lightning strikes more people than hurricanes or tornadoes.
Brazil has been a world record in incidence per square kilometer, according to research conducted by the National Institute of Special Research (INPE) in partnership with NASA.

Brazil suffers from a high incidence of lightning because it is the largest tropical country in the world. It is in the tropics where the biggest storms of the globe occur.
According to Inpe, lightning kills about 200 people a year in Brazil.

Lightning can kill, directly affecting people, starting fires and reaping lives.

Here you will find a short summary of procedures to protect yourself, and also protect buildings, equipment and electrical installations.

Where it falls and how it spreads

When searching for a path to download, the Lightning reaches high points and more pointed, where there is greater concentration of charges.
Thus, it can fall near a place several times, contrary to the saying that "where one ray fell not another falls".
The damage caused by lightening action is enormous, causing damage to a very large area.

rays in the city

Not all lightning comes through electrical network. Sometimes it goes down the TV antenna, or other ways like towers, trees, etc.

Lightning travels through poles, telephone networks, and wire fences when they are not sectioned and grounded.
Lightning can hit buildings and houses as high points. The same happens with churches, chimneys, TV towers, trees or even a house in the open.
In such situations the power grid has no influence

Forms of protection

For the protection of buildings, it is necessary to use other types of lightning rods according to the ABNT NBR 5419 standard.

One of these is the rod-type lightning rod (known as the Franklin high rise buildings.
This lightning rod provides protection for the building (or part thereof) contained under the protective cone whose apex is at the top of the capturing rod.

What is within that space will be protected (Franklin method).
The protection angle will vary according to the level of protection required, type of occupancy, content value, location and height of the building.
The ABNT NBR 5419 standard provides the details of its specification.

The Franklin method does not apply to all types of buildings, and other methods (electrogeometric, mesh or Faraday cage) must be used, in accordance with ABNT NBR 5419.
In the case of larger buildings, over 60 meters, only the Faraday cage method applies.
In any of the methods used, there should always be adequate grounding.

Radioactive lightning rods do not provide adequate protection and its use is prohibited in Brazil.

For antennas installed on buildings, the antenna mount or attachment point must be properly grounded.
When the antenna is not located above the building, special care is required, such as additional grounding and shielding installation.

Proper lightning protection and adequate overvoltage protection are associated with an efficient grounding system.
The type of grounding and the number of grounding electrodes (grounding rods) to be used to ensure the effectiveness of grounding depend on soil characteristics.

There are several equipment for the protection of your low voltage network. The most common are surge arresters (varistors), surge suppressors, which can be found in the specialist trade.

For proper operation of these equipments it is necessary that they are properly specified, that their electrical network is well grounded and that the neutral conductor is continuous, well dimensioned and with well made seams.
Good grounding (rods, earthenware, descent conductors, etc.) is the responsibility of the owner of the property.

For sensitive equipment such as television, there are other types of protection that are installed in the jacks.
These devices are known as surge protectors.
Computers, fax machines, answering machines, or even televisions may require special protection.
For the efficient operation of any protection device of these equipments, it is necessary that the grounding system of your installation is also efficient.

In case of a bad grounding, the devices may not work perfectly.

sources: Civil Defense of R. J. / Cemig

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