Branch Circuits, Receptacles & Protection
Receptacle spacing rules, GFCI and AFCI protection requirements, tamper-resistant receptacles, wet location covers, and lighting switches.
- State the maximum receptacle spacing of 12 feet per NEC 210.52
- Identify the 4-6 mA trip threshold for Class A GFCI devices
- List locations requiring GFCI protection per NEC 210.8
- Explain AFCI protection requirements for dwelling unit circuits
- Describe tamper-resistant receptacle and wet location cover requirements
Leçon 1
Receptacle Spacing & Small Appliance Branch Circuits
The 12-Foot Rule
Per NEC 210.52, receptacle outlets in habitable rooms of dwelling units must be placed so that no point along the floor line of any wall space is more than 6 feet from a receptacle outlet. This means the maximum spacing between two receptacles along a wall is 12 feet - so that a standard 6-foot appliance cord can always reach an outlet from any point along the wall.
Wall space measurements count any wall segment that is 2 feet or wider, including space around doors, fireplaces, and between windows. Fixed room dividers and bar counters also count as wall space.
Small Appliance Branch Circuits
Per NEC 210.11(C)(1), a minimum of two 20-amp small appliance branch circuits are required for the kitchen and related areas in a dwelling. These circuits serve the kitchen countertop receptacles, dining room, breakfast room, pantry, and similar areas.
Key rules for small appliance branch circuits:
- Must be 20-amp rated (not 15-amp)
- Must serve only receptacle outlets in kitchen, dining, breakfast, pantry, and similar rooms
- No lighting is permitted on these circuits (except as provided for switched receptacles)
- The two circuits cannot be combined into one larger circuit
Common Exam Trap
The exam asks for the minimum number of small appliance circuits. The answer is 2. Many test-takers incorrectly choose 1 or 3. Remember: exactly two 20-amp circuits minimum, serving kitchen countertops and related areas.
Garage Receptacles
Per NEC 210.52(G), at least one GFCI-protected receptacle is required in each attached and detached garage with electric power. The receptacle must be a 120V, 20-amp circuit with GFCI protection since garages are considered wet/damp locations.
The maximum spacing between receptacles along a wall is 12 feet (6 feet from any point), and a kitchen requires a minimum of two 20-amp small appliance branch circuits - these are among the most commonly tested NEC rules.