Electrical Wire Size Calculator
- Min by ampacity (NEC 310)
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- Min by voltage drop
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- Recommended
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NEC 310.16, 75°C copper THWN. Aluminum derated. Always verify with local code & a licensed electrician.
About this tool
Electrical Wire Size Calculator 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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