In Plain English
Quick Answer
The national rulebook for electrical wiring that sets the safety standards electricians must follow in the US.
Definition
Definition
The National Electrical Code (NFPA 70) is the benchmark for safe electrical design, installation, and inspection in the United States, adopted by most jurisdictions as law. Published by the National Fire Protection Association, it is updated every three years. Local amendments may modify or supplement NEC requirements.
Context
Why It Matters in Bidding
Estimators pricing electrical scope must bid to the NEC edition the jurisdiction has adopted, because each three-year cycle can add requirements—such as expanded GFCI, AFCI, or surge protection—that increase material and labor. Local amendments further modify the baseline, so assuming the wrong code version can leave a bid short. Code-driven changes are also frequent sources of addenda and change orders.
Example
Example
Before pricing a multifamily project, the estimator confirms the city has adopted a recent NEC edition requiring surge protection at the service, then adds those devices and labor that an older code cycle would not have demanded.
See Also
Related Terms
FAQ
Questions Contractors Ask
Which NEC edition should an estimator bid to?
Bid to the edition the local jurisdiction has legally adopted, not necessarily the newest published version. Adoption lags publication, and many areas add local amendments. Estimators should verify the enforced code edition and any amendments with the authority having jurisdiction, because newer cycles often introduce requirements that raise material and labor costs.
How does a new NEC edition affect electrical bid pricing?
Each update can mandate additional protective devices, larger conductors, or new installation methods, all of which add material and labor. If a project transitions to a newer adopted edition mid-design, the changes may surface as addenda or change orders. Estimators should track which cycle governs and price the resulting scope accurately.
Do local amendments override the NEC?
Local jurisdictions adopt the NEC as law and may amend it, adding stricter rules or modifying specific articles. Those amendments govern within that jurisdiction. Estimators and electricians must check both the adopted NEC edition and the local amendments, since regional requirements can change conduit, grounding, or protection rules that affect the bid.
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