The national rulebook for electrical wiring that sets the safety standards electricians must follow in the US.
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.
The 2023 NEC requires arc fault protection on virtually all branch circuits in dwelling units.
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