This European Standard defines, describes and specifies the main characteristics of the voltage at a network user's supply terminals in public low voltage, medium and high voltage AC electricity networks under normal operating conditions. This standard describes the limits or values within which the voltage characteristics can be expected to remain at any supply terminal in public European electricity networks and does not describe the average situation usually experienced by an individual network user.NOTE 1 For the definitions of low, medium and high voltage see 3 (Definitions).This European Standard does not apply under abnormal operating conditions, inc