Awg Wire Size Chart May 2026

The chart’s most valuable column is ampacity (current-carrying capacity). It prevents fires: a 14 AWG wire is rated for 15A, 12 AWG for 20A, 10 AWG for 30A, etc. Ignoring this is the #1 cause of residential electrical fires.

4/5 – Indispensable for pros, dangerous for amateurs without a disclaimer. awg wire size chart

By providing resistance per foot, the chart allows professionals to calculate voltage drop over long runs (e.g., 100+ ft from a solar panel to a charge controller). This is something cheap online calculators often get wrong. 4/5 – Indispensable for pros, dangerous for amateurs

The chart is based on solid wire. Stranded wire (more flexible) has a slightly larger overall diameter for the same gauge. Most printed charts omit this, leading to DIYers buying stranded wire that won’t fit into a push-in connector. The chart is based on solid wire

you understand NEC derating. Avoid it if you just want to know “what wire for a 20A breaker?” – in that case, memorize: 14 AWG = 15A, 12 AWG = 20A, 10 AWG = 30A and ignore the chart’s complexity.