What does the "great myth" concerning grounding state?

The "great myth" concerning grounding states that a connection to earth always yields no voltage. This concept can lead to misunderstandings about the nature of grounding in electrical systems. While it is true that connecting to earth can help to stabilize the voltage levels in a system and provide a path for fault currents, it does not imply that there will be absolutely no voltage present at the ground connection.

In practice, grounding does not guarantee that the voltage at the ground will always be zero. Various factors, such as ground resistance, potential differences, and fault conditions, can result in measurable voltage at ground connections. Understanding this myth is crucial for safe electrical system design and operation since it highlights the importance of recognizing that grounding does not eliminate voltage under all circumstances.

The other options may reflect misunderstandings commonly held about grounding, such as the belief that grounding can completely eliminate hazards, that grounding systems can be applied universally without considering specific circumstances, or that all ground connections possess the same electrical characteristics, which they do not.