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Lightning protection - Electrical installation protection system

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General rules of electrical installation design
Connection to the MV utility distribution network
Connection to the LV utility distribution network
MV and LV architecture selection guide for buildings
LV Distribution
Protection against electric shocks and electrical fires
Sizing and protection of conductors
LV switchgear: functions and selection
Overvoltage protection
Energy Efficiency in electrical distribution
Power Factor Correction
Power harmonics management
Characteristics of particular sources and loads
PhotoVoltaic (PV) installation
Residential premises and other special locations
ElectroMagnetic Compatibility (EMC)

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.

Solution implementation

  • 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. J16).

Fig. J16Example of protection of a large-scale electrical installation