30 Amp Cable Size at 120 Meters (400V Three-Phase (IEC European Grid))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 30 A over 120 m (393.7 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 8.34V (2.08%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 8.8V (2.2%)
Voltage at Load391.7 VLine Loss: 433.4 W
Max Power & Breaker20.78 kW30A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 30A at 120m
| 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 | 88.96 V (22.24%) | 311.0 V | 146.74 V (36.68%) | 4622.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 53.37 V (13.34%) | 346.6 V | 88.04 V (22.01%) | 2773.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 33.36 V (8.34%) | 366.6 V | 55.03 V (13.76%) | 1733.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 22.24 V (5.56%) | 377.8 V | 36.68 V (9.17%) | 1155.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 13.34 V (3.34%) | 386.7 V | 22.01 V (5.5%) | 693.4 W | ~ ≤5% |
| 16 mm² | 76 A | 59 A | 8.34 V (2.08%) | 391.7 V | 13.76 V (3.44%) | 433.4 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 5.34 V (1.33%) | 394.7 V | 8.8 V (2.2%) | 277.3 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 3.81 V (0.95%) | 396.2 V | 6.29 V (1.57%) | 198.1 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 2.67 V (0.67%) | 397.3 V | 4.4 V (1.1%) | 138.7 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.91 V (0.48%) | 398.1 V | 3.14 V (0.79%) | 99.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 1.4 V (0.35%) | 398.6 V | 2.32 V (0.58%) | 73.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 1.11 V (0.28%) | 398.9 V | 1.83 V (0.46%) | 57.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.89 V (0.22%) | 399.1 V | 1.47 V (0.37%) | 46.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.72 V (0.18%) | 399.3 V | 1.19 V (0.3%) | 37.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.56 V (0.14%) | 399.4 V | 0.92 V (0.23%) | 28.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.44 V (0.11%) | 399.6 V | 0.73 V (0.18%) | 23.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.33 V (0.08%) | 399.7 V | 0.55 V (0.14%) | 17.3 W | ✓ OK (≤3%) |
FAQ — 30 Amp Cable Size at 120 Meters (400V Three-Phase (IEC European Grid))
What mm² cable size is required for 30A at 120 meters (400V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 30A over 120m at 400V (voltage drop: 8.34V or 2.08%).
What is the power capacity of 30A at 400V?
At unity power factor, 30A at 400V supports 20.78 kW with a standard 30A circuit breaker.
Related Lengths & Currents (400V)
30A · 5m (400V)30A · 10m (400V)30A · 15m (400V)30A · 20m (400V)30A · 25m (400V)30A · 30m (400V)30A · 35m (400V)30A · 40m (400V)30A · 45m (400V)30A · 50m (400V)30A · 60m (400V)30A · 70m (400V)10A · 120m (400V)16A · 120m (400V)20A · 120m (400V)25A · 120m (400V)32A · 120m (400V)40A · 120m (400V)50A · 120m (400V)63A · 120m (400V)80A · 120m (400V)100A · 120m (400V)125A · 120m (400V)160A · 120m (400V)200A · 120m (400V)