15 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 15 A over 250 m (820.2 ft).
Copper Cable (≤3% Drop)240 mm²Drop: 0.67V (2.79%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 0.66V (2.76%)
Voltage at Load23.3 VLine Loss: 10.0 W
Max Power & Breaker0.36 kW15A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 15A at 250m
| 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 | 107.0 V (445.83%) | 0.0 V | 176.5 V (735.42%) | 1605.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 64.2 V (267.5%) | 0.0 V | 105.9 V (441.25%) | 963.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 40.12 V (167.19%) | 0.0 V | 66.19 V (275.78%) | 601.9 W | Drop High |
| 6 mm² | 41 A | 32 A | 26.75 V (111.46%) | 0.0 V | 44.12 V (183.85%) | 401.2 W | Drop High |
| 10 mm² | 57 A | 44 A | 16.05 V (66.87%) | 8.0 V | 26.47 V (110.31%) | 240.7 W | Drop High |
| 16 mm² | 76 A | 59 A | 10.03 V (41.8%) | 14.0 V | 16.55 V (68.95%) | 150.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 6.42 V (26.75%) | 17.6 V | 10.59 V (44.12%) | 96.3 W | Drop High |
| 35 mm² | 125 A | 97 A | 4.59 V (19.11%) | 19.4 V | 7.56 V (31.52%) | 68.8 W | Drop High |
| 50 mm² | 151 A | 118 A | 3.21 V (13.38%) | 20.8 V | 5.29 V (22.06%) | 48.1 W | Drop High |
| 70 mm² | 192 A | 150 A | 2.29 V (9.55%) | 21.7 V | 3.78 V (15.76%) | 34.4 W | Drop High |
| 95 mm² | 232 A | 181 A | 1.69 V (7.04%) | 22.3 V | 2.79 V (11.61%) | 25.3 W | Drop High |
| 120 mm² | 269 A | 210 A | 1.34 V (5.57%) | 22.7 V | 2.21 V (9.19%) | 20.1 W | Drop High |
| 150 mm² | 309 A | 241 A | 1.07 V (4.46%) | 22.9 V | 1.76 V (7.35%) | 16.1 W | ~ ≤5% |
| 185 mm² | 353 A | 275 A | 0.87 V (3.61%) | 23.1 V | 1.43 V (5.96%) | 13.0 W | ~ ≤5% |
| 240 mm² | 415 A | 324 A | 0.67 V (2.79%) | 23.3 V | 1.1 V (4.6%) | 10.0 W | ✓ OK (≤3%) |
| 300 mm² | 477 A | 372 A | 0.54 V (2.23%) | 23.5 V | 0.88 V (3.68%) | 8.0 W | ✓ OK (≤3%) |
| 400 mm² | 570 A | 445 A | 0.4 V (1.67%) | 23.6 V | 0.66 V (2.76%) | 6.0 W | ✓ OK (≤3%) |
FAQ — 15 Amp Cable Size at 250 Meters (24V DC (Off-Grid Solar / Industrial Control))
What mm² cable size is required for 15A at 250 meters (24V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 240 mm² copper cable for 15A over 250m at 24V (voltage drop: 0.67V or 2.79%).
What is the power capacity of 15A at 24V?
At unity power factor, 15A at 24V supports 0.36 kW with a standard 15A circuit breaker.
Related Lengths & Currents (24V)
15A · 5m (24V)15A · 10m (24V)15A · 15m (24V)15A · 20m (24V)15A · 25m (24V)15A · 30m (24V)15A · 35m (24V)15A · 40m (24V)15A · 45m (24V)15A · 50m (24V)15A · 60m (24V)15A · 70m (24V)10A · 250m (24V)16A · 250m (24V)20A · 250m (24V)25A · 250m (24V)32A · 250m (24V)40A · 250m (24V)50A · 250m (24V)63A · 250m (24V)80A · 250m (24V)100A · 250m (24V)125A · 250m (24V)160A · 250m (24V)200A · 250m (24V)