Conductor Derating
Calculate ampacity derating per NEC 310.15
Derating Results
Minimum Required Ampacity
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Recommended Wire Size
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Load Current
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Continuous Load Factor
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Adjusted Load
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Temperature Correction
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Conduit Fill Factor
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Combined Derating
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Calculation Breakdown
NEC Derating Requirements
Temperature Correction (310.15(B))
When ambient temperature exceeds 30°C (86°F), ampacity must be corrected using Table 310.15(B)(1).
Higher temperature insulation (90°C) has better correction factors.
Conduit Fill (310.15(C))
When more than 3 current-carrying conductors are in a raceway, ampacity must be reduced per Table 310.15(C)(1).
Neutrals carrying unbalanced load count as current-carrying.