*Question G0B02:
According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?*  

*Correct Answer is  C: AWG number 12*  

### AI Response: (may contain errors)  

According to the National Electrical Code (NEC), the minimum wire size for a 20-ampere circuit breaker is AWG number 12. Here's why:

1. **Correct Answer: AWG number 12**
   - The NEC specifies that for a 20-amp circuit, the minimum wire size should be 12 AWG. This is because 12 AWG wire can safely carry up to 20 amperes of current without overheating, ensuring safe operation and reducing the risk of electrical fires.

2. **Why the Other Choices are Incorrect:**
   - **AWG number 20 (Choice A):** This wire size is too small for a 20-amp circuit. It is typically used for low-current applications, such as small electronic devices, and cannot safely handle 20 amperes.
   - **AWG number 16 (Choice B):** While larger than 20 AWG, 16 AWG is still insufficient for a 20-amp circuit. It is generally used for circuits with lower current requirements, such as lighting or small appliances.
   - **AWG number 8 (Choice D):** This wire size is larger than necessary for a 20-amp circuit. While it can handle more current, using it for a 20-amp circuit would be inefficient and more costly due to the larger wire size.

3. **Useful Rule of Thumb:**
   - For general household wiring, the NEC provides guidelines on wire sizes based on the circuit's amperage. For a 20-amp circuit, 12 AWG is the standard minimum size. This ensures the wire can handle the current load safely and efficiently.