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Thickness insulation—sheath

Insulation thickness between conductors and sheath used to calculate $T_1$ with following considerations:

Type of screen/sheath of multi-core cables

Symbol
$t_1$
Unit
mm
Formulas
$t_i+t_{scb}+t_{scs}+\frac{\Delta d_{sh}}{2}$single-core cables
$t_i+t_{scb}+t_{scs}+\frac{\Delta d_{sh}}{2}$multi-core cables, type SS
$t_i+t_{scb}+t_{scs}+t_f+\frac{\Delta d_{sh}}{2}$multi-core cables, type SC
$t_i+t_f+t_{scb}+t_{scs}+\frac{\Delta d_{sh}}{2}$multi-core cables, type CC
$t_i+t_{scb}$pipe-type cables
Related
$\Delta d_{sh}$
Depth of corrugation [mm]
$t_f$
Thickness of filler/belt insulation [mm]
$t_i$
Thickness insulation [mm]
$t_{scb}$
Thickness screen bedding [mm]
$t_{scs}$
Thickness screen serving [mm]
Used in
$G_1$
Geometric factor $G_1$
$T_1$
Thermal resistance conductor—sheath [K.m/W]
$t_{1t}$
Thickness insulation—sheath, transient [mm]
$X_G$
Factor $X_G$
$Y_G$
Factor $Y_G$
$Y_K$
Factor $Y_K$