The geometric constant of the circle where the soil has dried out $D_{dry}$ is based on the book 'Kabel und Leitungen für Starkstrom' by L. Heinhold, 5th edition 1999 (in German).
| $e^{\frac{2\pi \Delta \theta_x}{\rho_4 n_{ph} \left(\mu W_I+W_d\right)}}$ | 1 cable, $D_{dry} > D_{x}$ |
| $e^{\frac{\frac{2\pi \Delta \theta_x}{\rho_4 n_{ph}}+\left(1-\mu\right) W_I \ln\left(g_x\right)}{W_I+W_d}}$ | 1 cable, $D_{dry} < D_{x}$ |
| $e^{\frac{2\pi \Delta \theta_x}{\rho_4 N_c \left(\mu W_I+W_d\right)}}$ | 2 cables flat touching / 3 cables touching trefoil, $D_{dry} > D_{x}$ |
| $e^{\frac{\frac{2\pi \Delta \theta_x}{\rho_4 N_c}+\left(1-\mu\right) W_I \ln\left(g_x\right)}{W_I+W_d}}$ | 2 cables flat touching / 3 cables touching trefoil, $D_{dry} < D_{x}$ |
| $e^{\frac{2\pi \Delta \theta_x}{\rho_4 N_c \left(\mu W_I+W_d\right)}}$ | 2/3 cables flat spaced, $D_{dry} > D_{x} > 2s_{c}$ |
| $e^{\frac{2\pi \Delta \theta_x}{\rho_4 N_c \left(\mu W_I+W_d\right)}}$ | 2/3 cables flat spaced, $D_{dry} > 2s_{c}$ > D_{x} |
| $e^{\frac{\frac{2\pi \Delta \theta_x}{\rho_4 N_c}+\left(1-\mu\right) W_I \ln\left(g_x\right)}{W_I+W_d}}$ | 2/3 cables flat spaced, $D_{x} > D_{dry} > 2s_{c}$ |
| $e^{\frac{\frac{2\pi \Delta \theta_x}{\rho_4}+2\left(\mu W_I+W_d\right) \ln\left(g_a\right)}{\mu W_I+W_d}}$ | 2/3 cables flat spaced, $2s_{c} > D_{dry} > D_{x}$ |
| $e^{\frac{\frac{2\pi \Delta \theta_x}{\rho_4}+N_c \left(1-\mu\right) W_I \ln\left(g_x\right)-2\left(W_I+W_d\right) \ln\left(g_a\right)}{W_I+W_d}}$ | 2/3 cables flat spaced, $D_{x} > 2s_{c} > D_{dry}$ |
| $e^{\frac{\frac{2\pi \Delta \theta_x}{\rho_4}+\left(1-\mu\right) W_I \ln\left(g_x\right)-2\left(\mu W_I+W_d\right) \ln\left(g_a\right)}{W_I+W_d}}$ | 2/3 cables flat spaced, $2s_{c} > D_{x} > D_{dry}$ |
