# Documentation

 Symbol Name Unit G $g$ Standard acceleration of gravity m/s$^2$ $G$ Conductance S/m $G_1$ Geometric factor $G_1$ $G_2$ Geometric factor $G_2$ for cables with separate sheaths $g_a$ Substitution coefficient g $G_b$ Geometric factor for backfill $g_{bs}$ Installation constant g $G_{corr}$ Geometric correction factor $G_{corr}$ for jacket around each core $g_{dry}$ Geometric constant of circle with dried-out soil p.u. $G_{encl}$ Factor G for the calculation of the Nusselt number $G_{FEA}$ Geometric reference factor $G_{FEA}$ based on FEM fitting $G_{od}$ Aspect ratio object/duct $g_s$ Substitution coefficient $g_s$ for eddy-currents $G_{s00}$ Factor $G_{s 0.0}$ $G_{s05}$ Factor $G_{s 0.5}$ $G_{s10}$ Factor $G_{s 1.0}$ $g_x$ Geometric constant of circle with characteristic diameter p.u. $\gamma_{bessel}$ Bessel constant p.u. $\gamma_c$ Skin and proximity effect factor $\gamma$ for PAC/GIL conductor $\gamma_{encl}$ Skin and proximity effect factor $\gamma$ for PAC/GIL enclosure $\gamma_{euler}$ Euler's constant m/s$^2$ $\gamma_t$ Attainment factor for groups of cables $\gamma_X$ Attenuation factor for crossing 1/m $GMD$ Geometric mean distance mm $GMR$ Geometric mean radius mm $\mathrm{Gr}_c$ Grashof number, conductor to gas $\mathrm{Gr}_{da}$ Grashof number, duct in air $\mathrm{Gr}_{encl}$ Grashof number, gas to enclosure $\mathrm{Gr}_{gd}$ Grashof number, gas to duct $\mathrm{Gr}_L$ Grashof number, ground to air $\mathrm{Gr}_{od}$ Grashof number, object to duct $\mathrm{Gr}_{og}$ Grashof number, object to gas $\mathrm{Gr}_{prot}$ Grashof number, surface to air