Which component is required for a system to be grounded according to electrical codes?

For a grounding system to be in compliance with electrical codes, it must be properly connected to the earth. Grounding to the earth provides a reference point for electrical systems, ensuring that any fault currents are safely dissipated. This connection to the earth serves not only to stabilize voltage levels but also to provide a path for fault currents to prevent electric shock and potential fires.

Using the earth as a grounding medium allows for effective dissipation of excess energy caused by surges, lightning strikes, or equipment malfunction. This is why establishing a physical connection to the earth is critical in grounding systems, making it a fundamental requirement in electrical codes. Other elements, such as water, air, or metal, do not serve this essential purpose in the context of grounding systems.