NEC (National Electrical Code)
NFPA 70, the model electrical code adopted across the US. Sets conductor ampacity, 40% conduit fill limits, demand factors for service sizing, and grounding rules. Local jurisdictions adopt specific editions — installations must match the code in force locally.
Where this appears in real estimates
This term isn't trivia — it's a working variable. These tools use it directly:
- figure your electrical load numbers — Estimate service demand from square footage and major appliances.…
- conduit fill estimate tool — Max conductor counts per conduit size at NEC 40% fill.…
- wire size estimate tool — Copper wire gauge (AWG) from circuit amperage and run length.…
Go deeper
- Sod vs Grass Seed — head-to-head decision guide
- Basement Finishing Chain — full project walkthrough
- Paver in New York — local pricing & climate
- Read the field guide on the blog — practitioner-level detail
- Related engineering article — from our licensed engineer
Reviewed: · Part of the CalculatorAsphalt Construction Glossary · Sources: see methodology & standards.