What portion of the current that returns through the system neutral goes to ground?

In an electrical system, particularly in a three-phase system with a neutral conductor, the amount of current that returns through the neutral and goes to ground is significant for maintaining system balance and safety. When the system is properly balanced, the return current through the neutral can be calculated based on the loads connected.

In this scenario, it is established that a considerable portion of the current might return to the ground through the neutral. The answer indicating that two-thirds of the current returns to ground is aligned with common practices in electrical engineering, especially in aspects dealing with grounding and neutral current behavior.

This understanding stems from observing how the load distribution and grounding techniques operate in balanced systems, making two-thirds a more substantial figure that reflects typical designs and the prevention of potential ground fault issues. It reflects practical implications in ensuring that enough current is directed safely, enhancing the overall reliability and safety of the electrical system.

Other options reflect numbers often used in different contexts or less common grounding scenarios and do not align as closely with the typical distributions observed in standard electrical systems.