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11.1. Three Phase Four Wire System

  • In this type of system a total of four conductors are used, three for three phases and one for neutral.
  • This system is very flexible and is used for distribution of electric power to domestic, commercial, industrial and other consumers.
  • The line voltage is times the phase voltage. The domestic and other single-phase loads needing higher voltages are connected between lines. The currents in three lines will not be equal and the phasor sum of line currents would return through neutral. The current in the neutral must be equal and opposite to the sum of tine currents.