What is the maximum spacing recommended for ground rods?

The recommended maximum spacing for ground rods is 20 feet. This guideline is based on ensuring effective grounding and lightning protection. When ground rods are spaced appropriately, they work together to provide a low-resistance path for electrical energy to dissipate into the earth.

Spacing ground rods too far apart can lead to inadequate grounding, where the combined resistance of multiple rods does not lower effectively. A distance of 20 feet strikes a balance that allows for good electrical conductivity while considering soil conditions and the need for collective grounding effectiveness.

In practical terms, this spacing helps in achieving the required grounding system resistance specified by safety standards, ensuring that in the event of a lightning strike or electrical fault, the system can effectively handle the resulting currents.