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 IV
The table in Figure 2 shows the different levels of Iimp in the regulatory case.
Fig. 1 – Basic example of balanced Iimp current distribution in 3 phase system
Fig. 2 – Table of Iimp values according to the building’s voltage protection level (based on IEC/EN 62305-2)
| Protection level as per EN 62305-2 | External lightning protection system designed to handle direct flash of: | Minimum required Iimp for Type 1 SPD for line-neutral network |
| I | 200 kA | 25 kA/pole |
| II | 150 kA | 18.75 kA/pole |
| III / IV | 100 kA | 12.5 kA/pole |
Autoextinguish follow current Ifi
This characteristic is applicable only for SPDs with spark gap technology. The autoextinguish follow current Ifi must always be greater than the prospective short-circuit current Isc at the point of installation.
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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