sentences:  Large voltages can appear on the enclosures of electrical equipment due to a fault in the electrical power system, such as a failure of insulation.Stray voltage is any case of undesirable elevated electrical potential, but more precise terminology gives an indication of the source of the voltage.Neutral to earth voltage (NEV) specifically refers to a difference in potential between a locally grounded object and the grounded return conductor, or neutral, of an electrical system.