EXPANSION PIECE 172/AR

Extension piece 172 AR Rd8-10
If the total length of the conductor exceeds 20 m, it must be equipped with an expansion piece to prevent damage caused by thermal expansion.

When a direct lightning strike hits a building protected by an external lightning protection system, large potential differences can arise between the building and installed systems (electrical, telecommunications cables), leading to dangerous fires and damage. Nearby lightning strikes generate strong magnetic fields that can damage electrical equipment. However, lightning strikes up to 2 km away can also generate dangerous overvoltages in the building's electrical equipment. OBO provides all necessary products for implementing reliable lightning protection: lightning rods, surge protectors, potential equalization and grounding accessories.

The grounding system is part of the external lightning protection that conducts the lightning current to earth and distributes it there. The most important principles for the even distribution of the lightning current without the formation of dangerous overvoltages are the shape and dimensions of the grounding electrode. Standard EN 62305-3 (IEC 62305-3) recommends as low a grounding resistance as possible < 10 ohms. The grounding system can be constructed using one of the following three systems. It is possible to connect different grounding systems together, but potential corrosion risks must be taken into account. Important guideline: Grounding systems must be connected to potential equalization! This product description is an automated translation of the original Finnish description.