For multiple cables twisted or bound together, a combined diameter circumscribing all cables can be calculated by multiplying the cable diameter of a single cable with the diameter factor. This value is also approximatively correct for three loose cables in trefoil formation.

Symbol
$DC_{\mathrm{p}}$
Unit
%
Formulae
$1$1 cable
$2$2 cables
$\frac{1}{-3 + 2 \sqrt{3}}$3 cables (triangular)
$\frac{1}{-1 + \sqrt{2}}$4 cables (square)