25 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 25 A over 15 m (49.2 ft).
Copper Cable (≤3% Drop)4 mm²Drop: 3.47V (0.5%)
Aluminum Cable (≤3% Drop)4 mm²Drop: 5.73V (0.83%)
Voltage at Load686.5 VLine Loss: 150.5 W
Max Power & Breaker29.88 kW25A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 25A 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 | 9.27 V (1.34%) | 680.7 V | 15.29 V (2.22%) | 401.2 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 5.56 V (0.81%) | 684.4 V | 9.17 V (1.33%) | 240.8 W | Drop High |
| 4 mm² | 32 A | 25 A | 3.47 V (0.5%) | 686.5 V | 5.73 V (0.83%) | 150.5 W | ✓ OK (≤3%) |
| 6 mm² | 41 A | 32 A | 2.32 V (0.34%) | 687.7 V | 3.82 V (0.55%) | 100.3 W | ✓ OK (≤3%) |
| 10 mm² | 57 A | 44 A | 1.39 V (0.2%) | 688.6 V | 2.29 V (0.33%) | 60.2 W | ✓ OK (≤3%) |
| 16 mm² | 76 A | 59 A | 0.87 V (0.13%) | 689.1 V | 1.43 V (0.21%) | 37.6 W | ✓ OK (≤3%) |
| 25 mm² | 101 A | 78 A | 0.56 V (0.08%) | 689.4 V | 0.92 V (0.13%) | 24.1 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 0.4 V (0.06%) | 689.6 V | 0.66 V (0.09%) | 17.2 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 0.28 V (0.04%) | 689.7 V | 0.46 V (0.07%) | 12.0 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 0.2 V (0.03%) | 689.8 V | 0.33 V (0.05%) | 8.6 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.15 V (0.02%) | 689.9 V | 0.24 V (0.03%) | 6.3 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.12 V (0.02%) | 689.9 V | 0.19 V (0.03%) | 5.0 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.09 V (0.01%) | 689.9 V | 0.15 V (0.02%) | 4.0 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.08 V (0.01%) | 689.9 V | 0.12 V (0.02%) | 3.3 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.06 V (0.01%) | 689.9 V | 0.1 V (0.01%) | 2.5 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.05 V (0.01%) | 690.0 V | 0.08 V (0.01%) | 2.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.03 V (0.01%) | 690.0 V | 0.06 V (0.01%) | 1.5 W | ✓ OK (≤3%) |
FAQ — 25 Amp Cable Size at 15 Meters (690V Three-Phase (Wind / Heavy Industrial))
What mm² cable size is required for 25A at 15 meters (690V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 4 mm² copper cable for 25A over 15m at 690V (voltage drop: 3.47V or 0.5%).
What is the power capacity of 25A at 690V?
At unity power factor, 25A at 690V supports 29.88 kW with a standard 25A circuit breaker.
Related Lengths & Currents (690V)
25A · 5m (690V)25A · 10m (690V)25A · 20m (690V)25A · 25m (690V)25A · 30m (690V)25A · 35m (690V)25A · 40m (690V)25A · 45m (690V)25A · 50m (690V)25A · 60m (690V)25A · 70m (690V)10A · 15m (690V)16A · 15m (690V)20A · 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)