A residential circuit is protected by a 20A circuit breaker. What is the minimum size wire that can be used for this circuit?
- A14 AWG
- 12 AWG
- C10 AWG
- D8 AWG
Exam tip
Always refer to the specific wire ampacity requirements for the correct wire size.
Why B is correct
According to 2026 NEC Article 210.3(B), the minimum wire size for a 20A circuit is 12 AWG. The 14 AWG wire is suitable for 15A circuits, and the 10 AWG and 8 AWG wires are for 30A and 40A circuits, respectively.