6.2.1.2 Air-termination conductors

The protected volume of an air-termination conductor is calculated using the protective angle method. The protected volume is defined by a combination of straight lines and circular arcs:

1. Horizontal air-termination conductor: The protected volume consists of two parts:
   
   • Along the sides of the air-termination conductor, the protected volume is defined by a line at the protective angle that runs parallel to the air-termination conductor.

   • At the ends of the air-termination conductor, the protected volume forms a semicircle whose radius is determined by the protective angle.

     This tent-shaped protected volume has already been described in section 4.1 and is shown in Figure 4.1.11.