Can the lower lead of the lightning rod be connected to the column iron?
If it is in a building outside meters do a line grounding (using 40*4 flat) can reach the grounding resistance requirements, do not need grounding, note that all the metal parts of the project are effectively connected with the grounding grid.
Lightning protection project specific requirements according to different projects, but the general approach is by each column bars at least two straight underground reinforced network and each of the three layer of a ring, and in the ground 1 meters away from a lightning line terminal box, and then leads to a wall or the same grounding meters do outdoor grounding connection and achieve the grounding requirements.
