Diameter over screen bedding

This is the diameter below screen, sometimes called $D_1$.

Symbol
$D_{scb}$
Unit
mm
Formulae
$F_x \left(d_c+t_{2i}\right)+2\left(t_f+t_{scb}\right)$Multi-core cables with common screen
$d_c+t_{2i}+2t_{scb}$otherwise