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.

$d_{\mathrm{x}}$

mm

$2 \sqrt{\frac{A_{\mathrm{c}}}{\pi}}$ | multi-core cables with sector-shaped conductors |

$d_{\mathrm{c}}$ | otherwise |

$d_{\mathrm{c}}$

$\pi$

$r_{\mathrm{c}}$

Radius of conductor [mm]

$s_{\mathrm{c}}$

$s_{\mathrm{x}}$

$X_{\mathrm{K}}$

Factor X_{K} [-]

$Y_{\mathrm{K}}$

Factor Y_{K} [-]

$y_{\mathrm{p}}$