NEC (National Electrical Code)
The widely adopted model code (NFPA 70) that sets the standard for safe electrical design, installation, and inspection in the United States.
Detailed Explanation
Published by the National Fire Protection Association (NFPA), the NEC is updated every three years (current edition: 2023). It is not a law itself, but becomes enforceable when adopted by state or local jurisdictions. The NEC covers wiring methods, equipment, special occupancies, and more. Key articles include 210 (Branch Circuits), 220 (Load Calculations), 250 (Grounding and Bonding), 310 (Conductors), and 334 (NM Cable). The C-10 exam heavily tests NEC knowledge.
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