This design method reduces the contact time between the Upward Streamer and the Downward Leader(Dart Leader) from the thundercloud. so It protects a wider range than general lightning protection system. It is used according to French Standard 17-102. Unlike the CV method, the protection range is set by the gain distance of the early streamer emission and the lightning distance by the rotating sphere without consideration of the field concentration factor of the ground due to lightning. But, because the rolling sphere method is applied, it can be applied up to a maximum height of 60m.

Chem-Rod Grounding System is the most efficient system that maintains low grounding resistance for more than 30 years regardless of ground soil type, geological structure, soil composition, moisture content and seasonal temperature change. Chem-Rod Grounding System uses the grounding method using the “Highly conductive ground rod of strong alkaline electrolytes”, and it is a new grounding method developed to satisfy the modernization of highly integrated computation and communication service and high reliability operation quality. It is particularly well suited for system that require extremely stable grounding performance, such as computational or telecom grounding, as well as grounding systems that provide the best solution for that are difficult to obtain low ground resistance for rock or soil layers.