What is the maximum average distance between grounds on structures with full cable downleads?

The maximum average distance between grounds on structures with full cable downleads is 100 feet. This standard is crucial for ensuring effective lightning protection by providing adequate grounding for electrical systems and structures. Proper grounding dissipates the electrical energy from a lightning strike, reducing the risk of damage to the structure and enhancing the safety of individuals inside.

A distance of 100 feet strikes a balance between practical installation considerations and the technical requirements for effective lightning protection. It allows for sufficient grounding while minimizing the number of ground connections needed, which can help to streamline installation and reduce costs.

Grounding systems are critical components of lightning protection systems, and adhering to these distance standards is essential for ensuring that the entire system functions effectively. By stipulating a maximum distance, the standard also helps prevent the potential for excessive resistance in grounding connections, which could compromise the system's efficacy.