Ampacity Calculator — Temperature & Bundling Derating | WireStandard
Calculate derated ampacity for copper conductors. Apply NEC temperature correction and bundling derating factors for THWN, THHN, XHHW, NM-B insulation types.
- Wire Gauge (AWG)
- Insulation Type
- Ambient Temperature (°C)
- Number of Conductors in Conduit
- Derated Ampacity
- Base Ampacity
- Temp. Correction
- Bundling Factor
- Installation not permitted
Based on NEC Table 310.12 (copper conductors). Temperature correction per NEC Table 310.15(B)(2)(a). Bundling derating per NEC Table 310.15(C)(1).