Codex — U.S. Electrical Construction Codes

/

CODEX

Built by the trade, for the trade.

An independent educational reference. Not the National Electrical Code® and not affiliated with the NFPA. Verify against the adopted code and your AHJ before doing work.

Explore

Codes States Origins Timeline

Helper Hub

Voltage Drop Box Fill Ampacity Dwelling Load

Glossary

Guides Glossary The Crew About Privacy

NEC® & National Electrical Code® are registered trademarks of the NFPA. Codex is educational and unofficial. v1.0 · offline-ready