If power is transmitted in 3-phase, 3-wire system, the volume of copper required will be

1. directly proportional to the square of the length
2. inversely proportional to the square of the voltage
3. inversely proportional to the power factor of the load
4. directly proportional to the power transmitted and the square of the length of the conductor and inversely proportional to the square of the voltage and square of the power factor of the load

Answer: 4. directly proportional to the power transmitted and the square of the length of the conductor and inversely proportional to the square of the voltage and square of the power factor of the load

Explanation:

K = 2P²pl² / WV_m²cos ϕ

Where K is the volume of the copper conductor.

If power is transmitted in a 3-phase, 3-wire system, the volume of copper required will be directly proportional to the power transmitted and the square of the length of the conductor and inversely proportional to the square of the voltage and square of the power factor of the load.