When an energized circuit neutral is cut or opened, what can the voltage across the open point be?

When an energized circuit neutral is cut or opened, the voltage across the open point can be equal to the circuit voltage because, in a typical circuit, the neutral wire is at ground potential when the circuit is complete. If the neutral is disconnected or opens, there is no longer a return path for the current. Consequently, the full circuit voltage appears across the open point because the potential difference is maintained between the live wire and the now floating potential of the cut or open neutral.

This situation can lead to hazardous conditions, as components connected to the circuit could become energized, posing a risk of electric shock or other electrical hazards. It’s important for technicians to understand that an open neutral does not result in a zero voltage condition or a lesser voltage across the open point; rather, they should be prepared for the possibility of encountering the full circuit voltage at that point.