The 2N device cables have to be protected against atmospheric overvoltage caused by external causes (lightning, e.g.). A surge can damage a device installed outside/inside the building if the wires are unprotected.
Therefore, we recommend that additional overvoltage protectors (OVP) be installed on the outer walls or roof for all the wires leading outside the building. Keep the following instructions while installing overvoltage protectors:
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Make sure that the overvoltage protector is installed as close as possible to the device installed outside the building.
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Make sure that the overvoltage protector is installed as close as possible to the device installed on an external part of the building.
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Make sure that the overvoltage protector is installed as close as possible to the point where the cabling leaves the building.
Figure 2. Overvoltage protection installation diagram for a device installed on the building facade and cables outside the building
Figure 3. Overvoltage protection installation diagram for a device installed on the building facade and cables inside the building
Figure 4. Overvoltage protection installation diagram for a device and cables installed outside the building
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