What determines the size of a counterpoise conductor?

The size of a counterpoise conductor is primarily determined by the height of the structure. This is because the effectiveness of a lightning protection system is influenced by how high the structure is above the surrounding terrain, which affects the electrical characteristics and grounded area necessary for safely dissipating lightning strikes. Taller structures require larger counterpoise conductors to ensure that they can handle the energy of a lightning strike effectively and provide a stable point for the lightning to travel into the ground.

While the design of the system, materials used, and local regulations may play a role in determining specifics of the installation or compliance, the critical factor for sizing the counterpoise conductor directly relates to the height, which affects the necessary electrical specifications for safely grounding the structure from the potential impact of lightning.