... , 1,400, 1,200, 720, 360, 240, 180, 120r/kW/h 4) Rotor speed at ib: 13.2 r/min 5 ... .8-1.1Un 15) Starting current: 0.5% ib 16) AC voltage 50Hz, 1 min: a) Between line and earth: 2 ... mass: 24g 19) Total meter mass: 1.5-1.6kg Single-phase Electromechanical Watt-hour Meter