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.

Symbol
$d_{\mathrm{x}}$
Unit
mm
Formulae
$2 \sqrt{\frac{A_{\mathrm{c}}}{\pi}}$multi-core cables with sector-shaped conductors
$d_{\mathrm{c}}$otherwise
Related
$A_{\mathrm{c}}$
$d_{\mathrm{c}}$
Used in
$G_{\mathrm{1}}$
$r_{\mathrm{c}}$
$X_{\mathrm{K}}$
$Y_{\mathrm{K}}$