When must a supplementary earth electrode system be installed?

The installation of a supplementary earth electrode system is essential when certain distances from the service entrance are exceeded. This requirement is based on the need to maintain an effective grounding system that ensures safety and proper operation of electrical systems. A grounding system helps to dissipate lightning strikes and fault currents safely into the ground, reducing the risk of electrical shocks and equipment damage.

When the distance from the service entrance to the point of grounding becomes significant, the effectiveness of the grounding system can be compromised. Therefore, adding a supplementary earth electrode system helps to enhance the grounding potential, ensuring that any surges or electrical disturbances are effectively managed. This installation is part of adhering to safety standards and regulations that seek to minimize risk in electrical installations, particularly in locations where the grounding might otherwise be inadequate due to distance.