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Factor $a_{shj}$ 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
$a_{shj}$
Formulae
$-0.00183533{\rho_{ab}}^4+0.0633263{\rho_{ab}}^3-0.908708{\rho_{ab}}^2+8.02417\rho_{ab}-52.8651$$0.005 < X_{G2} <= 0.03$
$-0.0036756{\rho_{ab}}^4+0.116068{\rho_{ab}}^3-1.34557{\rho_{ab}}^2+7.37721\rho_{ab}-25.131$$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