What are the purposes of a grounding electrode?

The correct choice highlights the multiple functions of a grounding electrode. Grounding electrodes serve crucial roles in electrical systems, primarily by ensuring safety and stability.

First, they provide a path to the earth for excess electrical energy, such as that from lightning strikes. This is vital for protecting both electrical equipment and personnel from the dangerous effects of lightning-induced surges.

Second, grounding electrodes help maintain surfaces at ground potential, which is important for safety. By connecting electrical systems to the ground, they minimize the risk of electric shock by ensuring that energized equipment does not build up a voltage that can be harmful.

Lastly, grounding electrodes play a role in draining static electricity. Static build-up can occur in various environments, and grounding provides a way for that charge to be safely dissipated, preventing potential sparks or discharge events that could lead to fires or explosions.

Thus, the comprehensive nature of grounding electrodes is best captured by the answer that encompasses all these functions.