Current Capacity Calculator
Determine maximum current capacity (ampacity) for different wire gauges based on insulation type and installation conditions.
Current Capacity Calculator
Calculate wire ampacity with derating factors
Ampacity Reference Table
Base ampacity values for copper conductors at 30°C ambient (single conductor, free air).
| AWG | PVC 60°C | PVC 75°C | PVC 90°C | XLPE/Silicone |
|---|---|---|---|---|
| 0000 | 195A | 230A | 260A | 260A |
| 000 | 165A | 200A | 225A | 225A |
| 00 | 145A | 175A | 195A | 195A |
| 0 | 125A | 150A | 170A | 170A |
| 1 | 110A | 130A | 145A | 145A |
| 2 | 95A | 115A | 130A | 130A |
| 4 | 70A | 85A | 95A | 95A |
| 6 | 55A | 65A | 75A | 75A |
| 8 | 40A | 50A | 55A | 55A |
| 10 | 30A | 35A | 40A | 40A |
| 12 | 20A | 25A | 30A | 30A |
| 14 | 15A | 20A | 25A | 25A |
| 16 | 10A | 13A | 18A | 18A |
| 18 | 7A | 10A | 14A | 14A |
| 20 | 5A | 7A | 11A | 11A |
| 22 | 3A | 5A | 7A | 7A |
Understanding Ampacity
Ampacity is the maximum current a conductor can carry continuously without exceeding its temperature rating. It depends on conductor size, insulation type, ambient temperature, and installation conditions.
Important: Always apply appropriate derating factors for bundled conductors and elevated temperatures. Exceeding ampacity limits causes overheating and can lead to insulation damage or fire.
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