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.
DC SPD applied to the Din rail type protects the DC electric system from surge. Also, the system allows replacement of the protective element (MOV), ensuring convenience and reduced cost. However, as only the protective module is provided, other components should be added when the system is installed in accordance with the site condition.
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