NEC (National Electrical Code)
Affiliate link — we may earn a commissionThe NEC is the standard for safe electrical installation in the United States, published by the National Fire Protection Association (NFPA) and updated every three years. It covers wiring methods, conductor sizing, overcurrent protection, grounding, and requirements for specific locations (kitchens, bathrooms, garages, outdoor). Local jurisdictions adopt the NEC (sometimes with amendments), and electrical inspectors enforce it. When someone says "that's not to code," they usually mean it violates the NEC or the local amendment. The 2023 NEC is the current edition. Residential work falls under Article 210 (branch circuits) and Article 220 (load calculations) most often.
Why It Matters
Any electrical work that needs a permit gets inspected against the NEC. Doing it wrong means the inspector fails it and you tear it out. Doing it wrong without a permit means a fire hazard or a discovery during a home sale that costs 10 times more to fix after the drywall is up.