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Diameter over screen bedding

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

Symbol
$D_{scb}$
Unit
mm
Formulas
$d_c+t_{2i}+2t_{scb}$Standard case
$F_x \left(d_c+t_{2i}\right)+2\left(t_f+t_{scb}\right)$round cables, sector-shaped conductors, common screen
$D_i+2\left(t_f+t_{scb}\right)$multi-core cables, sector-shaped conductors, common screen
$D_i+2t_{scb}$multi-core cables, sector-shaped conductors, separate screen
Related
$d_c$
External diameter conductor [mm]
$D_i$
Diameter over insulation incl. insulation screen [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 screen bedding [mm]
Used in
$A_{sc}$
Cross-sectional area screen [mm$^2$]
$A_{scb}$
Cross-sectional area screen bedding [mm$^2$]
$D_f$
Diameter over filler [mm]
$D_{sc}$
Diameter over screen [mm]
$d_{sc}$
Mean diameter screen [mm]
$r_{osc}$
Radius over capacitive insulation layers [mm]
$\rho_{sc}$
Specific electrical resistivity screen material [$\Omega$.m]
$T_{scb}$
Thermal resistance screen bedding [K.m/W]