70 Amp Cable Size at 15 Meters (690V Three-Phase (Wind / Heavy Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 70 A over 15 m (49.2 ft).
Copper Cable (≤3% Drop)16 mm²Drop: 2.43V (0.35%)
Aluminum Cable (≤3% Drop)25 mm²Drop: 2.57V (0.37%)
Voltage at Load687.6 VLine Loss: 294.9 W
Max Power & Breaker83.66 kW70A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 70A at 15m
| 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 | 25.95 V (3.76%) | 664.1 V | 42.8 V (6.2%) | 3145.8 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 15.57 V (2.26%) | 674.4 V | 25.68 V (3.72%) | 1887.5 W | Drop High |
| 4 mm² | 32 A | 25 A | 9.73 V (1.41%) | 680.3 V | 16.05 V (2.33%) | 1179.7 W | Drop High |
| 6 mm² | 41 A | 32 A | 6.49 V (0.94%) | 683.5 V | 10.7 V (1.55%) | 786.4 W | Drop High |
| 10 mm² | 57 A | 44 A | 3.89 V (0.56%) | 686.1 V | 6.42 V (0.93%) | 471.9 W | Drop High |
| 16 mm² | 76 A | 59 A | 2.43 V (0.35%) | 687.6 V | 4.01 V (0.58%) | 294.9 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 1.56 V (0.23%) | 688.4 V | 2.57 V (0.37%) | 188.7 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 1.11 V (0.16%) | 688.9 V | 1.83 V (0.27%) | 134.8 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.78 V (0.11%) | 689.2 V | 1.28 V (0.19%) | 94.4 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.56 V (0.08%) | 689.4 V | 0.92 V (0.13%) | 67.4 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.41 V (0.06%) | 689.6 V | 0.68 V (0.1%) | 49.7 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.32 V (0.05%) | 689.7 V | 0.53 V (0.08%) | 39.3 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.26 V (0.04%) | 689.7 V | 0.43 V (0.06%) | 31.5 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.21 V (0.03%) | 689.8 V | 0.35 V (0.05%) | 25.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.16 V (0.02%) | 689.8 V | 0.27 V (0.04%) | 19.7 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.13 V (0.02%) | 689.9 V | 0.21 V (0.03%) | 15.7 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.1 V (0.01%) | 689.9 V | 0.16 V (0.02%) | 11.8 W | ✓ OK (≤3%) |
FAQ — 70 Amp Cable Size at 15 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 70A at 15 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 16 mm² copper cable for 70A over 15m at 690V (voltage drop: 2.43V or 0.35%).
What is the power capacity of 70A at 690V?
At unity power factor, 70A at 690V supports 83.66 kW with a standard 70A circuit breaker.
Related Lengths & Currents (690V)
70A · 5m (690V)70A · 10m (690V)70A · 20m (690V)70A · 25m (690V)70A · 30m (690V)70A · 35m (690V)70A · 40m (690V)70A · 45m (690V)70A · 50m (690V)70A · 60m (690V)70A · 70m (690V)10A · 15m (690V)16A · 15m (690V)20A · 15m (690V)25A · 15m (690V)32A · 15m (690V)40A · 15m (690V)50A · 15m (690V)63A · 15m (690V)80A · 15m (690V)100A · 15m (690V)125A · 15m (690V)160A · 15m (690V)200A · 15m (690V)