lost neutral
noun1
Business, Electrical, Electrical engineering, Electricity, Electromagnetism, Energy, Engineering, Natural sciences, Physical sciences, Physics A dangerous situation where the neutral wire in a split-phase power system becomes broken or disconnected, forcing all electrical current to flow directly between the two line wires and exposing loads connected between line and neutral to unstable and potentially-excessive voltages, posing a risk of equipment damage, electrical fire, or electric shock.