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Diameter over insulation, transient

This is used for transient calculation acc. IEC 60853 when considering an equivalent conductor for multi-core cables.

Symbol
$D_{it}$
Unit
mm
Formulas
$d_c+2\left(t_i+t_{shj}\right)$multi-core cables, sector-shaped conductors
$F_x \left(d_c+2\left(t_i+t_{shj}\right)\right)$otherwise
Related
$d_c$
External diameter conductor [mm]
$F_x$
Geometrical distance factor for multi-core cables
$t_i$
Thickness insulation [mm]
$t_{shj}$
Thickness sheath jacket [mm]
Used in
$A_{it}$
Cross-sectional area insulation (IEC 60853) [mm$^2$]
$d_{ct}$
External diameter conductor, transient [mm]
$Q_{it1}$
Thermal capacitance insulation, 1st portion (IEC 60853) [J/(m.K)]
$Q_{it2}$
Thermal capacitance insulation, 2nd portion (IEC 60853) [J/(m.K)]
$t_{1t}$
Thickness insulation—sheath, transient [mm]