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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
Related
$d_c$
External diameter of conductor [mm]
$F_x$
Geometrical distance factor for multi-core cables
$t_{2i}$
Thickness of insulation between conductors [mm]
$t_f$
Thickness of filler/belt insulation [mm]
$t_{scb}$
Thickness of screen bedding [mm]
Used in
$A_{sc}$
Cross-sectional area of screen [mm$^2$]
$A_{scb}$
Cross-sectional area of screen beddig [mm$^2$]
$D_f$
External diameter of the filler [mm]
$D_{sc}$
Diameter over screen [mm]
$d_{sc}$
Mean diameter of screen [mm]
$T_{scb}$
Thermal resistance of screen bedding [K.m/W]