Geometric reference factor $G_{FEA}$ based on FEM fitting

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
$G_{FEA}$
Formulae
$-760.75{X_{G2}}^4+323.985{X_{G2}}^3-55.8292{X_{G2}}^2+7.80188X_{G2}+0.107238$
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