Calculate Size Of — Cable [patched]

For 25 mm² Cu: (R = 0.727\ \Omega/km), (X = 0.080\ \Omega/km) (approx). [ V_d = \sqrt3 \times 81.7 \times 0.1 \times (0.727\times 0.85 + 0.080\times 0.526) ] [ = 14.15 \times (0.618 + 0.042) \approx 14.15 \times 0.66 = 9.34\ \textV ] Percentage: (9.34/415 \approx 2.25%) → acceptable (<3%).

| Load current (A) | Min size (mm²) | Voltage drop (mV/A/m) | |-----------------|----------------|------------------------| | 20 | 2.5 | 18 | | 30 | 4 | 11 | | 45 | 6 | 7.3 | | 65 | 10 | 4.4 | | 85 | 16 | 2.8 | | 110 | 25 | 1.75 | calculate size of cable

Calculate the let-through energy and ensure the cable size can withstand it. Upsize if necessary (rare, but possible). For 25 mm² Cu: (R = 0