Connection set according to DIN EN 62561-1 for using the reinforcing iron (longitudinal iron) of reinforced concrete columns or walls as a conductor. By using reinforcing iron contained in the reinforced concrete columns, the additional installation of round conductors (St/tZn) for lightning protection / earthing / equipotential bonding can be omitted. The electrically relevant connection is implemented over the entire length of the reinforced concrete column using a vertical reinforcing iron.