3 storey houses, choose the lightning belt or lightning rod?
It's better to find a shaking table and test the grounding resistance, not more than 0.4 ohms. If not satisfied, then into a iron or steel pipe in the vicinity of 1m, and the original connection, increase the grounding area.
Select the direct pipe into the underground as grounding iron or galvanized, and consider the use of upper circle lightning with good. However, iron or steel pipe into the ground shall not be less than 1.5m, with 40 x 4 flat connecting the upper lightning belt lightning with 12 round bars available.
3 storey houses, choose lightning well.
