The main objective of the electrical installation protection system is to limit overvoltages to values that are acceptable for the equipment.
The electrical installation protection system consists of:
=one or more SPDs depending on the building configuration;
=the equipotential bonding: metallic mesh of exposed conductive parts.
The procedure to protect the electrical and electronic systems of a building is as follows.
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=Identify all sensitive loads and their location in the building.
=Identify the electrical and electronic systems and their respective points of entry into the building.
=Check whether a lightning protection system is present on the building or in the vicinity.
=Become acquainted with the regulations applicable to the building's location.
=Assess the risk of lightning strike according to the geographic location, type of power supply, lightning strike density, etc.
=Install bonding conductors on frames by a mesh.
=Install a SPD in the LV incoming switchboard.
=Install an additional SPD in each subdistribution board located in the vicinity of sensitive equipment (see Fig.1).
– Example of protection of a large-scale electrical installation