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The lightning protection of a complex of structures (LPCS)

The standard IEC 61024 provides information for the design of lightning protection of structures (LPS). In determining the position of the air-termination system two methods are generally suggested: the protective angle method and the rolling sphere method. The paper discusses some additional criteria for the LPS with reference to a case study of a complex of strategic buildings constituted by existing and historical structures. The paper suggests the mark map that allows to determine globally the interactions between the structures of the complex. It is a graphical method performed by rolling a sphere with a variable radius related to the protection level and to the height of the structure