// FREE CALCULATORS
Cable Ampacity Derating
Apply temperature correction and grouping factors to cable base ampacity per NEC Table 310.16 and IEC 60364-5-52. Instant adequacy check against design load current.
Apply temperature correction and grouping/bundling factors to cable base ampacity. Base values from NEC Table 310.16 (60/75/90°C ratings, copper and aluminium). Temperature correction per NEC Table 310.15(B)(1) (30°C base) or IEC 60364-5-52 (30°C air, 20°C ground). Grouping factors per NEC Table 310.15(C)(1) or IEC B.52.17. Supports conduit, cable tray, and direct burial installation methods.
// INPUTS
// Results update automatically as you type
// CABLE BASE AMPACITY
// DERATING CONDITIONS
Reference: 30°C (NEC) / 30°C air, 20°C ground (IEC)
NEC: neutral counts only if carrying unbalanced or harmonic load. IEC: enter the number of circuits or multicore cables
Enter manufacturer nameplate ampacity if known
Actual current the cable needs to carry
Base Ampacity (table)
-A
Temperature Correction Factor
-
Grouping / Bundling Factor
-
Derated Ampacity
-A
Design Load Current
-A
Status
-
Disclaimer: For reference and preliminary estimation only. Verify results against the applicable code, project specification, and equipment data before use in design documents. Found an error or an outdated reference? Let us know at [email protected].
Please check inputs.