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.
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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.1).
SPDs’ operating characteristics are defined by several technical characteristics. The following are some technical characteristics that should be considered: maximum continuous operating voltage, ac or dc application, nominal discharge current (defined by a magnitude and waveform), voltage-protection level (the terminal voltage that is present when the SPDs are discharging a specific current) and temporary overvoltage […]
Surges may be caused by an indirect lightning strike but, the majority are caused by equipment being turned on or off within a facility. These surges damage components costing money to repair or replace as well as create unplanned downtime resulting in unfulfilled orders, missed deadlines, unreliable systems and/or dangerous situations. The GHX Surge Protective Device (SPD) Series for […]
Maximum discharge current Imax The maximum discharge current Imax is defined according to the estimated exposure level relative to the building’s location. The value of the maximum discharge current (Imax) is determined by a risk analysis (see table in Figure 1). Fig. 1 – Recommended maximum discharge current Imax according to the exposure level Exposure […]
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