Oklahoma Electrical Practice Exam

What is the smallest wire allowed by the NEC for class I power limited circuits?

1. 16 AWG

2. 18 AWG

3. 20 AWG

4. 22 AWG

The correct answer is: 18 AWG

The National Electrical Code (NEC) specifies the minimum wire size for Class I power-limited circuits to ensure safe operation and adequate current-carrying capacity. For Class I power-limited circuits, the minimum allowable wire size is 18 AWG. This size is considered sufficient for handling the minimum current requirements while maintaining a safe electrical environment. Smaller gauge wires, like 20 AWG or 22 AWG, would not provide adequate capacity and could lead to overheating or voltage drop issues in a power-limited circuit. Understanding these specifications is crucial to ensuring compliance with safety standards and preventing potential hazards in electrical installations.