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The main advantage of using three-phase power over single-phase power is that it can deliver more power with less conductor material. In a three-phase system, the power supply is more balanced and consistent, allowing for a total power output that is significantly higher compared to single-phase systems for the same amount of conductor material used. This is particularly beneficial in industrial and commercial settings where heavy machinery or large equipment requires a substantial amount of power.

Three-phase power provides a continuous and even flow of energy, which reduces the fluctuation of current and voltage that can occur in single-phase systems. By utilizing three wires for phase conductors, the three-phase system ensures that each phase can share the load, leading to increased efficiency and reduced losses. This not only contributes to the overall efficiency of the electrical system but also means that, for the same voltage and current ratings, three-phase systems require thinner wires than a comparable single-phase system would.

The other options relate to installation simplicity, cost-effectiveness for residential purposes, and frequency, but they do not encapsulate the primary advantage in terms of power delivery capacity and efficiency, which is what makes three-phase systems particularly advantageous in many applications.