The system frequency of a cable is limited to the choices below. However, when laid in a project, the frequency of every cable system can be chosen arbitrary.

Symbol
$f$
Unit
Hz
Used in
$\lambda_{\mathrm{2}}$
$\lambda_{\mathrm{3}}$
$\omega$
$P_{\mathrm{L}}$
$p_{\mathrm{soil}}$
$X_{\mathrm{0}}$
$X_{\mathrm{s}}$
Choices
IdFrequency
0.00 Hz
16.716.7 Hz
25.025 Hz
50.050 Hz
60.060 Hz