Capacitance of insulation

Symbol
$C_b$
Unit
F/m
Formulae
$\frac{2\pi \epsilon_0 \epsilon_i}{\ln\left(\frac{r_{osc}}{r_{isc}}\right)}$Default
$\frac{2\pi \epsilon_0 \epsilon_i}{\ln\left(\frac{2c_c \left({r_{osc}}^2-{c_c}^2\right)}{r_{isc} \left({r_{osc}}^2+{c_c}^2\right)}\right)}$Two-core cables with common screen
$\frac{2\pi \epsilon_0 \epsilon_i}{\ln\left(\sqrt{\frac{3{c_c}^2 \left({r_{osc}}^2-{c_c}^2\right)^3}{{r_{isc}}^2 \left({r_{osc}}^6+{c_c}^6\right)}}\right)}$Three-core cables with common screen
Used in