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Factor $c_{shj}$ for jacket around each core

The equation for three-core cables with jacket around each core is based on the Jicable paper 'Thermal analysis of three-core SL-type cables with jacket around each core using the IEC standard' by L.D. Ramirez et al., dated 2019.

Symbol
$c_{shj}$
Formulae
$1.05538{\rho_{ab}}^4-33.7582{\rho_{ab}}^3+397.204{\rho_{ab}}^2-2133.54\rho_{ab}-657.704$$0.005 < X_{G2} <= 0.03$
$0.372559{\rho_{ab}}^4-11.8278{\rho_{ab}}^3+137.785{\rho_{ab}}^2-734.738\rho_{ab}-1488.81$$0.03 < X_{G2} <= 0.15$
Related
$\rho_{ab}$
Thermal resistivity of armour bedding [K.m/W]
Used in
$G_{corr}$
Geometric correction factor $G_{corr}$ for jacket around each core