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Copper Wire Basics

The allowable ampacity of insulated copper conductors by the wire size and insulation type

The following restrictions, from the National Electrical Code, apply when there are no more than three current-carrying conductors in a cable or enclosure.

Maximum Allowable Ampacity for Copper Wire


Cross Sections of Copper Wires & Conductors

Cross-Sections of Copper Wires & Conductors

About Don Vandervort
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Don Vandervort has developed his expertise for more than 30 years, as Building Editor for Sunset Books, Senior Editor at Home Magazine, author of more than 30 home improvement books, and writer of countless magazine articles. He appeared for 3 seasons on HGTV’s “The Fix,” and served as MSN’s home expert for several years. Don founded HomeTips in 1996.

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