|3 phase A.C distribution system requires 4 wires.
||D.C distribution system requires only one wire with the ground as a return path.
|The voltage at the far end is a less i.e. voltage drop in the distributor is more to the presence of inductance.
||Therefore the cost of erection is less than the A.C system.
|The efficiency of power transmission is less .
||Voltage drop is less in the distributor due to the absence of inductance voltage regulation is good.
|3phase 3 wire 4 wire are the types of the A.C distribution system.
||The transformer cannot be used for improving voltage level.