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.
Implementation
The procedure to protect the electrical and electronic systems of a building is as follows.
Search for information
=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.1).
The IEC 62305 standard parts 1 to 4 (NF EN 62305 parts 1 to 4) reorganizes and updates the standard publications IEC 61024 (series), IEC 61312 (series) and IEC 61663 (series) on lightning protection systems. Part 1 – General principles This part presents general information on lightning and its characteristics and general data, and introduces […]
Impulse current Iimp 1. Where there are no national regulations or specific regulations for the type of building to be protected: the impulse current Iimp shall be at least 12.5 kA (10/350 µs wave) per branch in accordance with IEC 60364-5-534. 2. Where regulations exist: standard IEC 62305-2 defines 4 levels: I, II, III and […]
The components of a SPD The SPD chiefly consists of (see Fig.1): 1) one or more nonlinear components: the live part (varistor, gas discharge tube, etc.); 2) a thermal protective device (internal disconnector) which protects it from thermal runaway at end of life (SPD with varistor); 3) an indicator which indicates end of life of […]
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