A lightning protection system usually consists of an outer and an inner lightning protection. The internal lightning protection prevents technical equipment in the building from being damaged. According to DIN 18015-1, it consists of lightning protection equipotential bonding and surge protection, whereby surge protection is further divided into medium and fine protection. Lightning protection equipotential bonding is achieved by connecting all electrically conductive parts at the building entrance to the main earthing rail by means of lightning current arresters. Surge protection devices are provided to reduce the voltage level. This surge protection works independently of lightning protection measures.
As a rule, a lightning protection system must comply with the specifications of the current DIN EN 62305 series of standards in parts 1–4 (with the associated VDE classifications VDE 0185-305 Parts 1–4), including the applicable corrections and supplements, and must have a (corrosion-resistant) equipotential bonding in accordance with DIN VDE 0100-540 on the foundation earthing rods.
Source: bauwion
