40 Amp Cable Size at 25 Meters (400V Three-Phase (IEC European Grid))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 40 A over 25 m (82.0 ft).
Copper Cable (≤3% Drop)6 mm²Drop: 6.18V (1.54%)
Aluminum Cable (≤3% Drop)10 mm²Drop: 6.11V (1.53%)
Voltage at Load393.8 VLine Loss: 428.0 W
Max Power & Breaker27.71 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 25m
| 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 | 24.71 V (6.18%) | 375.3 V | 40.76 V (10.19%) | 1712.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 14.83 V (3.71%) | 385.2 V | 24.46 V (6.11%) | 1027.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 9.27 V (2.32%) | 390.7 V | 15.29 V (3.82%) | 642.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 6.18 V (1.54%) | 393.8 V | 10.19 V (2.55%) | 428.0 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 3.71 V (0.93%) | 396.3 V | 6.11 V (1.53%) | 256.8 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 2.32 V (0.58%) | 397.7 V | 3.82 V (0.96%) | 160.5 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.48 V (0.37%) | 398.5 V | 2.45 V (0.61%) | 102.7 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.06 V (0.26%) | 398.9 V | 1.75 V (0.44%) | 73.4 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.74 V (0.19%) | 399.3 V | 1.22 V (0.31%) | 51.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.53 V (0.13%) | 399.5 V | 0.87 V (0.22%) | 36.7 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.39 V (0.1%) | 399.6 V | 0.64 V (0.16%) | 27.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.31 V (0.08%) | 399.7 V | 0.51 V (0.13%) | 21.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.25 V (0.06%) | 399.8 V | 0.41 V (0.1%) | 17.1 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.2 V (0.05%) | 399.8 V | 0.33 V (0.08%) | 13.9 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.15 V (0.04%) | 399.8 V | 0.25 V (0.06%) | 10.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.12 V (0.03%) | 399.9 V | 0.2 V (0.05%) | 8.6 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.09 V (0.02%) | 399.9 V | 0.15 V (0.04%) | 6.4 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 25 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 40A at 25 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 6 mm² copper cable for 40A over 25m at 400V (voltage drop: 6.18V or 1.54%).
What is the power capacity of 40A at 400V?
At unity power factor, 40A at 400V supports 27.71 kW with a standard 40A circuit breaker.
Related Lengths & Currents (400V)
40A · 5m (400V)40A · 10m (400V)40A · 15m (400V)40A · 20m (400V)40A · 30m (400V)40A · 35m (400V)40A · 40m (400V)40A · 45m (400V)40A · 50m (400V)40A · 60m (400V)40A · 70m (400V)10A · 25m (400V)16A · 25m (400V)20A · 25m (400V)25A · 25m (400V)32A · 25m (400V)50A · 25m (400V)63A · 25m (400V)80A · 25m (400V)100A · 25m (400V)125A · 25m (400V)160A · 25m (400V)200A · 25m (400V)