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Thickness of screen serving

The screen serving usually consists of water-blocking swelling tape.

Its thickness is added to the thickness of insulation to sheath $t_1$ which is used to calculate the thermal resistance between conductor and sheath. Therefore it has the same thermal resistivity as the insulation in the calculation. In reality, it usually has a higher value, but the error is small because the layer is thin with typical thickness of approx. 0.5 mm.

Symbol
$t_{scs}$
Unit
mm
Used in
$A_{scs}$
Cross-sectional area of screen serving [mm$^2$]
$D_{scs}$
Diameter over screen serving [mm]
$g_s$
Substitution coefficient $g_s$ for eddy-currents
$s_c$
Separation of conductors in a system [mm]
$t_1$
Thickness of insulation to sheath [mm]
$t_{1t}$
Thickness of insulation to sheath, transient [mm]