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.
As the world continues to shift towards cleaner and more sustainable energy sources, the development of solar connectors has become increasingly important. These small, yet essential components of solar panel systems are responsible for connecting the panels together and ensuring them operating at maximum efficiency. In this article, we will explore the current state of […]
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 […]
Knowing individual surge components is helpful to understand, but what drives the standards for SPDs are performance aspects or features for each device. After identifying the power distribution system to which the SPD is to be connected, one should compare different available devices by the following: 1. Maximum Continuous Operating Voltage (MCOV). The MCOV is the […]
We focus on providing high-quality equipment and components to meet the needs of customers around the world.
