Lightning theory is a massive electrostatic discharge between electrically charged regions within clouds, or between a cloud and the Earth''''s surface. The charged regions within the atmosphere temporarily equalize themselves through a lightning flash, commonly referred to as a strike if it hits an object on the ground. There are three primary types; from a cloud to itself (infra-cloud or IC); from one cloud to another cloud (CC) and finally between a cloud and the ground (CG). Although lightning is always accompanied by the sound of thunder, distant lightning may be seen but be too far away for the thunder to be heard.
Surge Protection Theory:
A surge protector (or surge suppressor) is an appliance designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or by shorting to ground any unwanted voltages above a safe threshold. This article primarily discusses specifications and components relevant to the type of protector that diverts (shorts) a voltage spike to ground; however, there is some coverage of other methods.
The main function of the lightning protection system installed on the existing building is to capture a lightning stroke and then conduct discharge current safety to the ground. In some conditions, however the active lightning system is the only possible method to protect from direct lightning strokes. Due to the arguments mentioned above, we recommended to use the active lightning protection whenever the conventional solution solution is inconvenient or when the former is more preferable to the latter as in the case of the efficient protection of architect.
Protection Radius Theory:
The Lightning Conductors are in accordance to the NF C 17-102 and similar E.S.E. Standards. The design requirements, protection level calculations and protection radius are obtained from this standard.
According to NF C 17-102 Ed. 2.0, the standard protection radius (Rp) of the E.S.E. is linked to T, the protection levels I (98%), II (95%), III (90%) or IV (80%) and the height of the SCHIRTEC E.S.E. above the structure to be protected (H, as a minimum 2 m) The protection level of the object depends on several factors such as:
If the object is inhabited or not
If the object is explosive or not,
Material of the roof and the roof construction (wood)
The more valuable and vulnerable the object is the higher the level of protection needed. e.g. an inhabited house, with a metal roof could be attributed to protection class 1. A telephone pole of low value could attributed to the protection class 4. The safety class can be calculated with our lightning risk program.
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