Equivalent diameter of screen and sheath

Equivalent diameter between screen and sheath.

Symbol
$d_s$
Unit
mm
Formulae
$\sqrt{\frac{{d_{sc}}^2+{d_{sh}}^2}{2}}$single-core cable or sheath and screen both being separate or common
$\sqrt{\frac{\left(F_x d_{sc}\right)^2+{d_{sh}}^2}{2}}$cable with separate screen and common sheath
$d_{sc}$screen but no sheath
$d_{sh}$sheath but no screen
$D_{encl}-t_{encl}$PAC/GIL