: Sizing based on British (BS 7671) and International (IEC 60364-5-52) standards.
Increase to 16 mm² Cu PVC: rating ~85 A, voltage drop ~2.9 mV/A/m. ( V_d = \frac2 \times 60 \times 30 \times 2.91000 = 10.44 , V ) → 4.5% → still slightly above 3%. cable size calculator
All cables have internal resistance. As electricity travels through a wire, some energy is lost as heat, causing the voltage at the end of the line to be lower than at the source. This "voltage drop" can cause equipment like motors and sensitive electronics to malfunction or wear out prematurely. : Sizing based on British (BS 7671) and