NEC 210: Branch Circuits
What This Article Covers
NEC Article 210 covers the requirements for branch circuits — the wiring from the final overcurrent device protecting the circuit to the outlets. It establishes branch-circuit ratings, the loads they can serve, and the receptacle and lighting outlet requirements that apply to dwelling and non-dwelling occupancies.
Key Requirements
- Branch-circuit ratings: 15, 20, 30, 40, and 50 amperes (210.3)
- Conductors must have ampacity not less than the rating of the circuit
- GFCI protection required for receptacles in specified locations (210.8)
- AFCI protection required for most dwelling unit branch circuits (210.12)
- Small-appliance branch circuits in dwellings: minimum two 20A circuits in kitchen and dining areas (210.11(C)(1))
- Required receptacles in dwelling units, including outdoor and garage outlets
- Lighting outlet requirements in each habitable room and certain non-habitable spaces
Common Field Applications
- Sizing a kitchen counter receptacle circuit
- Determining whether a bathroom needs GFCI (yes — 210.8(A)(1))
- Choosing between a 15A and a 20A circuit for a small appliance
Common Mistakes & Inspection Failures
- Putting receptacles and lighting on the same 20A small-appliance circuit
- Forgetting AFCI protection on bedroom outlets
- Using 14 AWG on a 20A branch circuit
Related NEC Articles
Have a specific question about NEC 210?
Ask Sparky AI for a plain-English answer with citation.
Ask Sparky AIFrequently Asked Questions
What does NEC 210 cover?
NEC Article 210 covers the requirements for branch circuits — the wiring from the final overcurrent device protecting the circuit to the outlets. It establishes branch-circuit ratings, the loads they can serve, and the receptacle and lighting outlet requirements that apply to dwelling and non-dwelling occupancies.
What are the key requirements of NEC 210?
Key requirements include: Branch-circuit ratings: 15, 20, 30, 40, and 50 amperes (210.3); Conductors must have ampacity not less than the rating of the circuit; GFCI protection required for receptacles in specified locations (210.8). See the full requirements list on this page.
What are common mistakes with NEC 210?
Putting receptacles and lighting on the same 20A small-appliance circuit Forgetting AFCI protection on bedroom outlets Using 14 AWG on a 20A branch circuit
Related Resources
Michael B.
IBEW Local 134 Journeyman · Licensed Contractor · IL Educator
Michael started in the IBEW at 18 and made foreman as a 3rd-year apprentice. Thirteen years in, he’s a Local 134 journeyman, a licensed electrical contractor, a licensed Illinois teacher, and OSHA 30 and EPA 608 certified. He teaches a federally recognized pre-apprenticeship on the south side of Chicago — where he’s helped 100+ students get into the IBEW. He built Sparky AI around exactly what the NJATC exam tests and what trips people up. Prep with this and you walk in ready.