{
  "calculator": "wire-size",
  "formulaVersion": "wire-size-2023-nec-1.2.0",
  "verifiedOn": "2026-08-21",
  "scope": "2023 NEC Table 310.16 base ampacity with 310.15 ambient and current-carrying-conductor adjustments plus 240.4(D) general-use small-conductor limits",
  "cases": [
    {
      "inputs": {
        "currentA": 20,
        "lengthFt": 25,
        "voltageV": 240,
        "maxDropPercent": 3,
        "phase": "single",
        "material": "copper",
        "insulationTemperatureC": 75,
        "ambientTemperatureC": 30,
        "currentCarryingConductors": 3,
        "continuousLoad": false
      },
      "expected": {
        "recommendedAwg": "12",
        "designCurrentA": 20,
        "ambientFactor": 1,
        "bundlingFactor": 1
      }
    },
    {
      "inputs": {
        "currentA": 20,
        "lengthFt": 25,
        "voltageV": 240,
        "maxDropPercent": 3,
        "phase": "single",
        "material": "copper",
        "ambientTemperatureC": 45,
        "currentCarryingConductors": 7,
        "continuousLoad": true,
        "insulationTemperatureC": 90
      },
      "expected": {
        "recommendedAwg": "8",
        "designCurrentA": 25,
        "ambientFactor": 0.87,
        "bundlingFactor": 0.7
      }
    }
  ]
}