How To Calculate Cable Size In Sq Mm Formula //free\\ Official

The formula to calculate the required millivolt drop per ampere per meter (

Suppose we want to calculate the cable size for a 3-phase installation with a maximum current of 50 A, a voltage rating of 400 V, and a length of 50 meters. We assume a copper conductor with a resistivity of 0.0172 Ωm and a conductivity of 56. how to calculate cable size in sq mm formula

$$A = \frac100 \times 50 \times 0.0175400 \times 8 = 2.73 sq mm$$ The formula to calculate the required millivolt drop

[ A = \frac2 \times 0.0172 \times 20 \times 506.9 ] [ A = \frac34.46.9 \approx 5.0 \text mm^2 ] a voltage rating of 400 V

$$A = \fracI \times L \times \rhoV \times \Delta V$$