45 Amp Cable Size at 40 Meters (230V Single-Phase (IEC Europe / UK / AU))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 45 A over 40 m (131.2 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 4.81V (2.09%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 5.08V (2.21%)
Voltage at Load225.2 VLine Loss: 216.7 W
Max Power & Breaker10.35 kW45A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 45A at 40m
| Cross-Section (mm²) | Cu Ampacity | Al Ampacity | Cu Voltage Drop | Load Voltage | Al Voltage Drop | Power Loss | Status |
|---|---|---|---|---|---|---|---|
| 1.5 mm² | 16 A | 12 A | 51.36 V (22.33%) | 178.6 V | 84.72 V (36.83%) | 2311.2 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 30.82 V (13.4%) | 199.2 V | 50.83 V (22.1%) | 1386.7 W | Drop High |
| 4 mm² | 32 A | 25 A | 19.26 V (8.37%) | 210.7 V | 31.77 V (13.81%) | 866.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 12.84 V (5.58%) | 217.2 V | 21.18 V (9.21%) | 577.8 W | Drop High |
| 10 mm² | 57 A | 44 A | 7.7 V (3.35%) | 222.3 V | 12.71 V (5.53%) | 346.7 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 4.81 V (2.09%) | 225.2 V | 7.94 V (3.45%) | 216.7 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 3.08 V (1.34%) | 226.9 V | 5.08 V (2.21%) | 138.7 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 2.2 V (0.96%) | 227.8 V | 3.63 V (1.58%) | 99.1 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.54 V (0.67%) | 228.5 V | 2.54 V (1.11%) | 69.3 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.1 V (0.48%) | 228.9 V | 1.82 V (0.79%) | 49.5 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.81 V (0.35%) | 229.2 V | 1.34 V (0.58%) | 36.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.64 V (0.28%) | 229.4 V | 1.06 V (0.46%) | 28.9 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.51 V (0.22%) | 229.5 V | 0.85 V (0.37%) | 23.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.42 V (0.18%) | 229.6 V | 0.69 V (0.3%) | 18.7 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.32 V (0.14%) | 229.7 V | 0.53 V (0.23%) | 14.4 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.26 V (0.11%) | 229.7 V | 0.42 V (0.18%) | 11.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.19 V (0.08%) | 229.8 V | 0.32 V (0.14%) | 8.7 W | ✓ OK (≤3%) |
FAQ — 45 Amp Cable Size at 40 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 45A at 40 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 45A over 40m at 230V (voltage drop: 4.81V or 2.09%).
What is the power capacity of 45A at 230V?
At unity power factor, 45A at 230V supports 10.35 kW with a standard 45A circuit breaker.
Related Lengths & Currents (230V)
45A · 5m (230V)45A · 10m (230V)45A · 15m (230V)45A · 20m (230V)45A · 25m (230V)45A · 30m (230V)45A · 35m (230V)45A · 45m (230V)45A · 50m (230V)45A · 60m (230V)45A · 70m (230V)10A · 40m (230V)16A · 40m (230V)20A · 40m (230V)25A · 40m (230V)32A · 40m (230V)40A · 40m (230V)50A · 40m (230V)63A · 40m (230V)80A · 40m (230V)100A · 40m (230V)125A · 40m (230V)160A · 40m (230V)200A · 40m (230V)