Substitution coefficient $\beta_1$ for eddy-currents

Symbol
$\beta_1$
Formulae
$\sqrt{\frac{4\pi \omega{\cdot}{10}^{-7}}{\rho_{sh}}}$Cables
$\sqrt{\frac{4\pi \omega{\cdot}{10}^{-7}}{\rho_{encl}}}$PAC/GIL