The IEC 62305 standard, which deals with lightning protection, defines "protection levels" as specific categories of lightning protection systems, each designed to provide a different degree of safety and effectiveness. Here is an overview of the key aspects of these protection levels according to this standard:
1. Four Levels of Protection (NP1 to NP4):
The standard specifies four levels of protection, with NP1 offering the strongest protection and NP4 the most basic. Each level is designed to withstand a certain type of lightning strike, with NP1 capable of withstanding the most severe lightning strikes. It is taken into account in the calculation of the protection radius of the early streamer emission lightning rods, like those in the range Ellips And Paraton@ir®.
2. Technical Parameters:
The levels differ in technical parameters such as the reference lightning current, current density, and probability of lightning interception. For example, an LP1 level system is designed to withstand higher lightning currents compared to an LP4 level system.
3. Choosing the Protection Level:
Selecting the appropriate level of protection depends on several factors, including the probability of a lightning strike, the value of the structure to be protected, and the potential consequences of a lightning strike. A risk analysis is typically conducted to determine the most suitable level of protection. The LPS Manager application allows you to determine the appropriate level of protection by answering a quick and simple questionnaire.
4. Design Requirements:
Each level of protection requires a specific design and installation of the lightning protection system, including the lightning rods, the grounding conductors, earthing systemand surge protection devices such as surge arresters.
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5. Comprehensive Protection:
The standard aims to provide complete protection against lightning, including structural protection against direct impacts, as well as surge protection and secondary electromagnetic effects.
In summary, the "protection levels" in the IEC 62305 standard are categories that define the intensity and complexity of lightning protection systems, enabling engineers and designers to choose the most suitable system based on the specific needs of a structure.
The NF C 17-102:2011 standard uses the results obtained to apply them to the calculations of the protection radii of lightning rods with early streamer emission devices.