Symbol
$F_{\mathrm{x}}$
Unit
-
Formulae
$1$single-core cables and multi-core cables with sector-shaped conductors
$2$two-core cables with round conductors
$\frac{1}{-3 + 2 \sqrt{3}}$three-core cables with round conductors
Used in
$D_{\mathrm{1}}$
$D_{\mathrm{2_{\mathrm{1}}}}$
$D_{\mathrm{f}}$
$D_{\mathrm{i}}$
$D_{\mathrm{it}}$