Single-Phase Neutral Wire Size Comparison
In a single-phase AC supply, the neutral wire acts as the return path for the electrical current after it passes through the load.
For standard single-phase circuits with balanced loads, the current flowing in the neutral wire is typically equal to the current flowing in the line (phase) wire.
To ensure safety and prevent overheating, both the line conductor and the neutral conductor must be capable of carrying this current equally.
Therefore, the neutral wire should have the same cross-sectional area as the line wire.
Result: For a single-phase supply, the size of the neutral wire should be equal to the size of the line wire.
Important Questions from Distribution Systems
In a DC 2-wire feeder, the drop per feeder conductor is 2%. Find the transmission efficiency of the feeder.
What is the percentage saving in feeder copper if the line voltage in a 2-wire DC systems is raised from 100 V to 200 V for the same power transmitted over the same power distance and having the same power loss?
A 2-wire DC distributor cable 800 m long is loaded with 1 A/m. Resistance of each conductor is 0.05 Ω/km. Calculate the maximum voltage drop if the distributor is fed from both ends with equal voltages of 220 V.
The fundamental difference between a transmission line and a feeder is that:
Main consideration in designing of feeder is:
