Bundled conductors are used to increase the transmission lines' ____.

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Bundled conductors are used to increase the transmission lines' capacity. By using two or more sub-conductors per phase spaced apart, the effective diameter of the conductor increases. This lowers the electrical field strength around the line, reducing corona losses and allowing more current to flow without exceeding temperature limits. The larger diameter also lowers the line’s reactance, which helps transfer more power for the same voltage and voltage regulation. The increased surface area improves heat dissipation, letting the line carry more current safely. So the primary result is a higher maximum power transfer capability, i.e., greater capacity.

These options don’t reflect the primary effect: while bundling can modestly affect efficiency and doesn’t change insulation or flexibility in a direct way, the main purpose is to raise capacity.