# Geometric mean radius

The formula for the GMR was taken from the book Electric Power Generation, Transmission, and Distribution by Leonard L. Grigsby (2006).

Symbol
$GMR$
Unit
mm
Formulae
$K_{GMR} r_{c}$
$r_{c}$
Used in
$GMD$
$L_{1}$
$L_{2}$
$L_{3}$
$X_{c}$