What is the minimum spacing required for multiple 10 feet deep ground rods installed in sandy or gravelly soils?

For multiple ground rods installed in sandy or gravelly soils, the minimum spacing required is critical to ensure proper grounding performance. The National Electrical Code (NEC) and industry best practices recommend that ground rods be installed at least 10 feet apart when the soil's resistivity conditions (like those found in sandy or gravelly soils) allow more effective grounding.

This distance helps to reduce the resistance to ground and minimizes the potential for ground system performance issues resulting from interference between ground rods. When ground rods are installed too close together, they can create a more limited area of influence, which can lead to higher resistance and less effective grounding. Therefore, maintaining a minimum spacing of 10 feet ensures that each ground rod can function independently and enhance the overall effectiveness of the grounding system.