90 Amp Cable Size at 20 Meters (230V Single-Phase (IEC Europe / UK / AU))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 90 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)25 mm²Drop: 3.08V (1.34%)
Aluminum Cable (≤3% Drop)35 mm²Drop: 3.63V (1.58%)
Voltage at Load226.9 VLine Loss: 277.3 W
Max Power & Breaker20.7 kW90A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 90A at 20m
| 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 | 51.36 V (22.33%) | 178.6 V | 84.72 V (36.83%) | 4622.4 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 30.82 V (13.4%) | 199.2 V | 50.83 V (22.1%) | 2773.4 W | Drop High |
| 4 mm² | 32 A | 25 A | 19.26 V (8.37%) | 210.7 V | 31.77 V (13.81%) | 1733.4 W | Drop High |
| 6 mm² | 41 A | 32 A | 12.84 V (5.58%) | 217.2 V | 21.18 V (9.21%) | 1155.6 W | Drop High |
| 10 mm² | 57 A | 44 A | 7.7 V (3.35%) | 222.3 V | 12.71 V (5.53%) | 693.4 W | Drop High |
| 16 mm² | 76 A | 59 A | 4.81 V (2.09%) | 225.2 V | 7.94 V (3.45%) | 433.3 W | Drop High |
| 25 mm² | 101 A | 78 A | 3.08 V (1.34%) | 226.9 V | 5.08 V (2.21%) | 277.3 W | ✓ OK (≤3%) |
| 35 mm² | 125 A | 97 A | 2.2 V (0.96%) | 227.8 V | 3.63 V (1.58%) | 198.1 W | ✓ OK (≤3%) |
| 50 mm² | 151 A | 118 A | 1.54 V (0.67%) | 228.5 V | 2.54 V (1.11%) | 138.7 W | ✓ OK (≤3%) |
| 70 mm² | 192 A | 150 A | 1.1 V (0.48%) | 228.9 V | 1.82 V (0.79%) | 99.1 W | ✓ OK (≤3%) |
| 95 mm² | 232 A | 181 A | 0.81 V (0.35%) | 229.2 V | 1.34 V (0.58%) | 73.0 W | ✓ OK (≤3%) |
| 120 mm² | 269 A | 210 A | 0.64 V (0.28%) | 229.4 V | 1.06 V (0.46%) | 57.8 W | ✓ OK (≤3%) |
| 150 mm² | 309 A | 241 A | 0.51 V (0.22%) | 229.5 V | 0.85 V (0.37%) | 46.2 W | ✓ OK (≤3%) |
| 185 mm² | 353 A | 275 A | 0.42 V (0.18%) | 229.6 V | 0.69 V (0.3%) | 37.5 W | ✓ OK (≤3%) |
| 240 mm² | 415 A | 324 A | 0.32 V (0.14%) | 229.7 V | 0.53 V (0.23%) | 28.9 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.26 V (0.11%) | 229.7 V | 0.42 V (0.18%) | 23.1 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.19 V (0.08%) | 229.8 V | 0.32 V (0.14%) | 17.3 W | ✓ OK (≤3%) |
FAQ — 90 Amp Cable Size at 20 Meters (230V Single-Phase (IEC Europe / UK / AU))
What mm² cable size is required for 90A at 20 meters (230V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 25 mm² copper cable for 90A over 20m at 230V (voltage drop: 3.08V or 1.34%).
What is the power capacity of 90A at 230V?
At unity power factor, 90A at 230V supports 20.7 kW with a standard 90A circuit breaker.
Related Lengths & Currents (230V)
90A · 5m (230V)90A · 10m (230V)90A · 15m (230V)90A · 25m (230V)90A · 30m (230V)90A · 35m (230V)90A · 40m (230V)90A · 45m (230V)90A · 50m (230V)90A · 60m (230V)90A · 70m (230V)10A · 20m (230V)16A · 20m (230V)20A · 20m (230V)25A · 20m (230V)32A · 20m (230V)40A · 20m (230V)50A · 20m (230V)63A · 20m (230V)80A · 20m (230V)100A · 20m (230V)125A · 20m (230V)160A · 20m (230V)200A · 20m (230V)