What assumptions are behind this ampacity chart?

The chart is labeled with the table assumptions used: 30 degrees Celsius ambient and not more than three current-carrying conductors.

Why does the chart separate copper and aluminum?

Because conductor material changes ampacity. Switching materials is a practical field need, so the page lets you flip the reference table directly.

SEO page: wire ampacity chart

Wire Ampacity Chart

A clean field reference for copper and aluminum conductor ampacity values, designed to replace cluttered corporate tables and tiny mobile-unfriendly layouts.

Versioned reference

Table 310.16 style lookup

Methodology context

Assumptions and usage boundaries

Table values assume defined ambient and conductor-count conditions.
Material changes allowable current, so copper/aluminum toggles stay explicit.
Final selections still require local code and installation-specific checks.

Read full methodology

Supporting links

Use this chart with related tools

Voltage drop calculator Resistance calculator Printable chart

FAQ

Ampacity reference notes

Why keep the assumptions visible on the page?

Because ampacity tables are safe only when their assumptions stay explicit. Hiding them makes the page look simpler but less trustworthy.

Why not overload this page with conduit fill and breaker sizing too?

Because that creates a support-heavy page and muddies the search intent. Keep this as a clean reference and link out to future dedicated tools.