Equipotential bonding
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The physical distance of a PV system to the external lightning protection system should be maintained as much as possible, in order to protect it. The typical values are between 0.5 m and 1 m. If this is not possible due to local circumstances, then the necessary distance may be reduced. This is only the case if the system is included in the external lightning protection system or an insulated system is being created, e.g. with the high-voltage-resistant, insulated isCon® conductor from the OBO range.
Separation distance in PV systems
Air-conditioning systems, electrical sensors and photovoltaic systems are examples for roof structures in which the separation distance must be maintained. This distance is required to avoid dangerous sparking and partial lightning currents between both the external lightning protection system and the metallic building parts and electrical devices. In particular, when PV systems are refitted, this is often not possible due to the construction situation. The safe solution: The high-voltage-resistant, insulated isCon® system from OBO. With the isCon® conductor, a separation distance of 0.75 m through the air and 1.5 m for solid matter can be maintained safely.
Position of the air-termination rods
The air-termination rods are to be positioned in such a way that there is no shading of the photovoltaic modules. A core shadow is sufficient to incur reductions in performance for the entire string. According to VDE 0185-305-3, Supplementary Sheet 5, an air-termination rod must be located at least 108x the diameter of the module away. In doing this, care should be taken that the photovoltaic system remains in the protection area of the air-termination rods. With the high-voltage-resistant, insulated isCon® system from OBO, the separation distance can be maintained safely.