# Factor $\alpha_M$

Factor $\alpha_M$ for the calculation of the geometric factor for multi-core cables according to IEC 60287-2-1.

Symbol
$\alpha_M$
Formulae
 $\frac{1}{\left(1+\frac{X_G}{1+\frac{X_G}{1+Y_G}}\right)^2}$ $n_c<=2$ $\frac{1}{\left(1+\frac{2X_G}{1+\frac{2}{\sqrt{3}} \left(1+\frac{2X_G}{1+Y_G}\right)}\right)^3}$ $n_c>=3$
Related
Used in