# Diameter factor in duct

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
$DC_{p}$
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)