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Thickness of additional layer over jacket

This layer is added on top of the serving/jacket. It may be a semi-conducting layer or a flame retardant added during extrusion process or a flame retardant paint being applied after installation. For calculations, the additional layer has the same material properties as the serving/jacket.

Symbol
$t_{jj}$
Unit
mm
Related
$t_j$
Thickness of jacket [mm]
Used in
$A_j$
Cross-sectional area of jacket [mm$^2$]
$D_e$
External diameter of object [mm]
$D_{eq}$
Equivalent diameter of a group of round objects [mm]
$D_j$
Diameter over jacket [mm]
$t_3$
Thickness of serving over armour [mm]
$T_j$
Thermal resistance of jacket [K.m/W]