Wire Gauge Ampacity Table
Search copper wire gauges and NEC-style ampacity ratings by insulation temperature and common use.
Copper conductor ampacity by insulation temperature rating (NEC Table 310.16 style, ≤3 current-carrying conductors, 30°C ambient). General reference only — always confirm with local code and a licensed electrician before wiring.
About this tool
Wire Gauge Ampacity Table is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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