Where: Vd = Voltage drop (V) I = Load current (A) L = Cable length (m) R = Resistance per unit length (Ω/m)
Example: 10 mm² copper, R20 = 1.83 Ω/km. At 70°C: [ R = 1.83 \times [1 + 0.00393(70 - 20)] = 1.83 \times 1.1965 = 2.19 \ \Omega/km ] how to calculate cable size
(Where L = Length in meters, I = Current in Amps, and R = Resistance of the cable) 4. Factor in the Circuit Breaker Where: Vd = Voltage drop (V) I =