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The purpose of the Atmospheric Discharge Protection System – SPDA – is to protect a structure against the direct incidence of atmospheric discharges. Its operation consists of capturing the electric current from the lightning discharge and conducting it to the ground in an efficient manner, minimizing the destructive effects resulting from the direct incidence on buildings, reducing the risk of fire, damage to structures or accidents to people inside them. In Brazil it is standardized by ABNT NBR-5419/15. It is composed of several parts:

• CAPTION: conductors and/or metal tips positioned on the roof of the structures with the objective of receiving the impact of the lightning discharge and distributing the electric current in the descents.

• DESCIDES: Several vertical conductors distributed around the structure’s façades with the purpose of conducting the electric current from the capture to the grounding located in the earth.

• GROUNDING: Metallic conductors circulating around the structure, buried in the ground, with the purpose of dissipating the lightning current to the ground.

• EQUIPMENT: Electrical connections of metallic parts inside the structure with the purpose of avoiding electric shocks and step voltages.

• MPS: Protection measures against surges that can reach a structure through the cables of electricity, signal, telecommunication lines, or other elements such as metallic pipes.

There are several ways to protect a structure. ABNT NBR-5419 provides for the three protection methods listed below and the types of usual systems.

Faraday Cage: Method that consists of a modular network of conductors involving all the sides of the structure to be protected (roof, facades), like a chess board, forming a kind of “cage”.

Electrogeometric Model: Method that determines a protection volume from the geometric development of a sphere around a captor (pole or mast higher than the structure to be protected).

Franklin: A method that determines a protection angle as a function of the height of the captor.

Structural: It is a type of system that uses a specific conductor of hot-dip galvanized steel, the RE-BAR, embedded in the structure along with reinforced concrete of pillars and foundations, with the function of dissipating the lightning discharge.

Natural: It is a type of system that considers metallic elements of the structure (roof tiles, profiles, pipes, etc.) as part of the SPDA. The structural system is considered natural.

Mixed: Combination of various methods/types of protection.

According to the regulatory standard of the Ministry of Labor and Employment (MTE), NR-10, structures must ensure safety to users in relation to electricity, and the PDA – protection against atmospheric discharges – an item provided for safety according to this federal regulation. Also by the code of consumer protection when buying a house or apartment, for example, this product must offer safety to the user. In some cities in Brazil there are municipal laws that require the PDA, as well as some entities that also require it, such as insurance companies, quality and safety certifiers, fire departments, among others. To determine the need or not of the PDA, the RISK MANAGEMENT must be done, which is a calculation memory foreseen in the ABNT NBR 5419-2/2015 standard that will determine the need and the adequate protection measures to minimize the risks caused by lightning.

The SPDA class is linked to the level of lightning protection of a system, and ranges from I to IV. It can be a more rigorous class, corresponding to class I, for example, to be adopted in an explosive material industry (oil refinery, fireworks factory, chemical plant) in which an accident caused by lightning would have enormous consequences, or a minimal protection class, less rigorous (class IV), that can be adopted in a residence. The determination of the protection class is done by RISK MANAGEMENT, which is a calculation memory provided in the ABNT NBR 5419-2/2015 standard. In this calculation several information is taken into account, such as dimensions, content and location of the structure, number of people, number of lightning strikes per km² per year of the place, if it has a fire prevention and combat system, among several other variables that will interfere in the rigor of the protection measures and consequently in the determination of the SPDA class.

It is a calculation memory provided in part 2 of the standard ABNT NBR 5419-2/2015 that has the purpose of providing a procedure to assess the risks in a structure due to atmospheric discharges. There are 4 types of risk: R1: risk of loss of human life; R2: risk of loss of public service; R3: risk of loss of cultural assets; R4: risk of loss of economic values. By adopting this calculation it will be possible to choose the appropriate protection measures to reduce the risks to a tolerable limit.

• Risk management prepared according to part 2 of NBR-5419/15

• Scale drawings with plans showing intake, discharge, grounding and equipotentialization, showing the dimensions, materials and positions of all the components of the external and internal SPDA. After the implementation it is advisable to perform as built updating.

• For class I or II system, report with data about the nature and resistivity of the soil, mandatorily containing details about the soil stratification, that is, the number of layers, the thickness and the resistivity value of each one.

• Record of tests performed on the grounding electrode and other measures taken in relation to the prevention against touch and step voltages. Verification of the physical integrity of the electrode (electrical continuity of the conductors) and if the use of additional measures on site was necessary to mitigate such phenomena (addition of insulating materials, moving away from the site, etc.), describing it.

• ART – annotation of technical responsibility for the project and physical implementation of the SPDA, registered at CREA/CONFEA, preferably by an electrical engineer.

• Annual or tri-annual inspection reports, as applicable, certifying the compliance and integrity of the SPDA.