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Factor $b_{shj}$ 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
$b_{shj}$
Formulae
$1.19428{\rho_{ab}}^4-37.1362{\rho_{ab}}^3+416.911{\rho_{ab}}^2-2081.31\rho_{ab}+5034.05$$0.005 < X_{G2} <= 0.03$
$0.953249{\rho_{ab}}^4-29.6207{\rho_{ab}}^3+331.32{\rho_{ab}}^2-1623.86\rho_{ab}+3524.83$$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