The radio base station is typically supplied by a separate line – irrespective of the rest of the building. The supply line to the cell site downstream of the meter and in the a.c. sub-distribution board upstream of the radio base station should be protected by adequate lightning current and surge arresters. This is required by the guidelines of all network operators, the German “ABB bulletin No. 16” as well as DIN VDE 0800-300 or IEC 62305.