News Information

Selection of a Type 2 SPD

2023-03-21

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 level

Low

Medium

High

Building environment

Building located in an urban or suburban area of grouped housing

Building located in a plain

Building where there is a specific risk: pylon, tree, mountainous region, wet area or pond, etc.

Recommended Imax value (kÂ)

20

40

65


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