Electrical conductor ampacity derating calculator

Calculate combined correction factor and adjusted ampacity with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use combined correction factor and adjusted ampacity to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Published base ampacity (A)
100
User-supplied correction factors (fractions)
0.9,0.8
Combined correction factor
0.72
Adjusted ampacity (A)
72

Try another scenario

Published base ampacity (A)
101
User-supplied correction factors (fractions)
[0.9, 0.8]
Combined correction factor
0.72
Adjusted ampacity (A)
72.72
Calculation method

Calculation method

Combined correction factor

Adjusted rating = published base rating × all supplied multiplicative correction factors.

Adjusted ampacity (A)

Adjusted rating = published base rating × all supplied multiplicative correction factors.

Symbols and units
a
Published base ampacity (A)
b
User-supplied correction factors (fractions)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Adjusted rating = published base rating × all supplied multiplicative correction factors. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
Are these inputs private?

These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Share this page
Share this calculator

Leave unchecked to share the page without your entered values.