Master Electrician Exam (NEC)Services, Feeders, and Branch CircuitsEasy
A master electrician is installing a 120V, 15A branch circuit for general-purpose receptacles in a dwelling unit. The circuit is protected by a 15A circuit breaker. Which of the following statements regarding the receptacle outlet requirements is correct?
- AAll 15A or 20A, 125V receptacles on this circuit must be of the grounding type.
- BThe receptacles must be rated for at least 20A.
- COnly one single receptacle is permitted on this 15A branch circuit.
- DReceptacles are not required to be tamper-resistant in dwelling units.
Show answer & explanationAnswer & explanation
Correct answer: A. All 15A or 20A, 125V receptacles on this circuit must be of the grounding type.
NEC 210.7(A) mandates that all 15A and 20A, 125V receptacles installed on 15A or 20A branch circuits must be of the grounding type. This ensures safety by providing a path for fault current.
Why the other options are wrong
- B. For a 15A branch circuit, 15A rated receptacles are permitted, as well as 20A rated receptacles if multiple outlets are served (NEC 210.21(B)(3)).
- C. Multiple receptacles are permitted on a 15A general-purpose branch circuit, provided the total load does not exceed the circuit rating.
- D. NEC 406.12 requires all 15A and 20A, 125V receptacles in dwelling units to be tamper-resistant.
Receptacle Grounding Requirement
All 15A and 20A, 125V receptacles connected to 15A or 20A branch circuits must be of the grounding type to provide equipment grounding.
- Applies to 15A and 20A, 125V receptacles.
- Applies to 15A and 20A branch circuits.
- Ensures safety by providing a ground path.
- Mandated by NEC 210.7(A).
Memory trick: Receptacles: Grounded for safety, protected for kids, sized for power.