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Last updated 2026-09-20. Please read this before relying on anything here.
Reference only
The tables and calculators on NECTables.com are provided for general reference and education. They are not professional engineering advice and are not a substitute for the adopted electrical code, the judgment of a licensed electrician or engineer, or the decision of the authority having jurisdiction (AHJ).
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NECTables.com is independent and is not affiliated with, sponsored by or endorsed by the National Fire Protection Association. NFPA 70®, National Electrical Code® and NEC® are registered trademarks of the NFPA. Those names are used here only to identify the standard that the data relates to. This site does not reproduce the text of the Code; values are commonly published engineering data and our own calculations.
Accuracy
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NECTables.com is an independent reference and is not affiliated with, endorsed by, or a substitute for the National Fire Protection Association (NFPA). NEC® and National Electrical Code® are registered trademarks of the NFPA. Values shown are commonly published engineering data and independent calculations based on the methods of NFPA 70; they are not a reproduction of the Code. Always confirm against the edition adopted in your jurisdiction, including local amendments, and consult a licensed electrician or engineer before doing electrical work.