40 Amp Cable Size at 400 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 40 A over 400 m (1312.3 ft).
Copper Cable (≤3% Drop)35 mm²Drop: 16.94V (2.46%)
Aluminum Cable (≤3% Drop)50 mm²Drop: 19.57V (2.84%)
Voltage at Load673.1 VLine Loss: 1173.9 W
Max Power & Breaker47.8 kW40A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 40A at 400m
| 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 | 395.37 V (57.3%) | 294.6 V | 652.17 V (94.52%) | 27392.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 237.22 V (34.38%) | 452.8 V | 391.3 V (56.71%) | 16435.2 W | Drop High |
| 4 mm² | 32 A | 25 A | 148.26 V (21.49%) | 541.7 V | 244.57 V (35.44%) | 10272.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 98.84 V (14.32%) | 591.2 V | 163.04 V (23.63%) | 6848.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 59.31 V (8.59%) | 630.7 V | 97.83 V (14.18%) | 4108.8 W | Drop High |
| 16 mm² | 76 A | 59 A | 37.07 V (5.37%) | 652.9 V | 61.14 V (8.86%) | 2568.0 W | Drop High |
| 25 mm² | 101 A | 78 A | 23.72 V (3.44%) | 666.3 V | 39.13 V (5.67%) | 1643.5 W | ~ ≤5% |
| 35 mm² | 125 A | 97 A | 16.94 V (2.46%) | 673.1 V | 27.95 V (4.05%) | 1173.9 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 11.86 V (1.72%) | 678.1 V | 19.57 V (2.84%) | 821.8 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 8.47 V (1.23%) | 681.5 V | 13.98 V (2.03%) | 587.0 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 6.24 V (0.9%) | 683.8 V | 10.3 V (1.49%) | 432.5 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 4.94 V (0.72%) | 685.1 V | 8.15 V (1.18%) | 342.4 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 3.95 V (0.57%) | 686.0 V | 6.52 V (0.95%) | 273.9 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 3.21 V (0.46%) | 686.8 V | 5.29 V (0.77%) | 222.1 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 2.47 V (0.36%) | 687.5 V | 4.08 V (0.59%) | 171.2 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 1.98 V (0.29%) | 688.0 V | 3.26 V (0.47%) | 137.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 1.48 V (0.21%) | 688.5 V | 2.45 V (0.35%) | 102.7 W | ✓ OK (≤3%) |
FAQ — 40 Amp Cable Size at 400 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 40A at 400 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 35 mm² copper cable for 40A over 400m at 690V (voltage drop: 16.94V or 2.46%).
What is the power capacity of 40A at 690V?
At unity power factor, 40A at 690V supports 47.8 kW with a standard 40A circuit breaker.
Related Lengths & Currents (690V)
40A · 5m (690V)40A · 10m (690V)40A · 15m (690V)40A · 20m (690V)40A · 25m (690V)40A · 30m (690V)40A · 35m (690V)40A · 40m (690V)40A · 45m (690V)40A · 50m (690V)40A · 60m (690V)40A · 70m (690V)10A · 400m (690V)16A · 400m (690V)20A · 400m (690V)25A · 400m (690V)32A · 400m (690V)50A · 400m (690V)63A · 400m (690V)80A · 400m (690V)100A · 400m (690V)125A · 400m (690V)160A · 400m (690V)200A · 400m (690V)