Electrical terms & NEC glossary
Plain-English definitions of the words that show up on plans, permits, and inspection reports — from GFCI and ampacity to bonding, OCPD, and MWBC.
Educational reference only. Electrical work can be fatal — de-energize and verify, follow the NEC and local code, and use a licensed electrician. Definitions are simplified for understanding and are not a substitute for the National Electrical Code or your AHJ.
Definitions are general-education summaries; exact requirements, ratings, and exceptions are defined by the National Electrical Code (NFPA 70) and enforced by your local authority having jurisdiction (AHJ). Always confirm against the current code edition adopted in your area. Not a substitute for training or the NEC.
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