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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
$D_{i,t}$
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
$A_{i,t}$
Cross-sectional area insulation (IEC 60853) [mm$^2$]
$d_{c,t}$
External diameter conductor, transient [mm]
$p_{i}$
Apportioning factor insulation
$Q_{i,t1}$
Thermal capacitance insulation, 1st portion (IEC 60853) [J/(m.K)]
$Q_{i,t2}$
Thermal capacitance insulation, 2nd portion (IEC 60853) [J/(m.K)]
$t_{1,t}$
Thickness conductor—sheath, transient [mm]