Lightning protection of hazardous structures

Separately mounted shielding systems, such as vertical diverter masts or ground wires, are best for most hazardous buildings, because they produce adequate shielding and sufficient clearances to prevent sparking. Cost of materials and installation are less than with the use of lightning rods, since conductors for the masts and ground wires are smaller, and corrosion-resisting steel wire can be used instead of copper. Location of masts or ground wires, sizes of conductors, necessary clearances, and ground resistances are considered in this article.