Ratio of losses affecting the filler

Ratio of losses in conductor and screen/sheath to losses in conductor affecting the filler of multi-core cables.

Symbol
$q_f$
Formulae
$1+\lambda_1$separate screen / separate sheaths (Type SS)
$1+\frac{\lambda_1}{2}$separate screen / common sheath (Type SC)
$1$common screen / common sheath (Type CC)