Equivalent diameter of a conductor

This equation somewhat underestimates the equivalent diameter of sector-shaped conductors that are not solid.

An alternative approach for multi-core cables with sector-shaped conductors would be to set the equivalent diameter equal to the nominal diameter of a round conductor with the same cross-sectional area. This would still only be an approximation, since the exact degree of compaction of sector-shaped conductors can vary and depends on manufacture. Also, nominal diameters are currently not available for all cross-sectional areas of conductors.

$2\sqrt{\frac{A_c}{\pi}}$Multi-core cables with sector-shaped conductors