Calculating the correct cable size is a multi-step process that ensures electrical safety, efficiency, and longevity of the installation. Using an undersized cable can lead to overheating and fire hazards, while an oversized cable incurs unnecessary costs.
I=P3×V×PFcap I equals the fraction with numerator cap P and denominator the square root of 3 end-root cross cap V cross cap P cap F end-fraction Where: = Power in Watts. how to calculate the cable size
= Line-to-Line Voltage (e.g., 230V for 1-phase, 400V for 3-phase). PFcap P cap F = Power Factor (typically 0.8 to 0.9 for motors). Calculating the correct cable size is a multi-step
Your cable must be capable of carrying at least . = Line-to-Line Voltage (e
Looking at the chart, 2.5 mm² cable is rated for roughly 20–25 Amps. It looks close, but the distance is 20 meters.