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 3-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
$\rho_{ab}$