*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)  

To determine the minimum wire size for a 20-ampere circuit breaker according to the National Electrical Code (NEC), we refer to the NEC guidelines for wire gauge and current-carrying capacity.

1. **Correct Answer: AWG number 12**
   - The NEC specifies that for a 20-ampere circuit, the minimum wire size should be AWG number 12. This wire size can safely handle the current without overheating, ensuring safe operation of the circuit.

2. **Why the other choices are incorrect:**
   - **A: AWG number 20**
     - This wire size is too small for a 20-ampere circuit. It is rated for a maximum of 10 amps, which could lead to overheating and potential fire hazards.
   - **B: AWG number 16**
     - Similar to AWG number 20, this wire size is also inadequate for a 20-ampere load. It is rated for a maximum of 13 amps, making it unsafe for this application.
   - **D: AWG number 8**
     - While AWG number 8 is capable of handling more than 20 amps (typically rated for 40 amps), it is unnecessarily large for a 20-ampere circuit. Using a larger wire size can be more expensive and less flexible, but it is not incorrect; it just exceeds the minimum requirement.

3. **Useful Rules of Thumb:**
   - A common rule of thumb is that for general wiring:
     - AWG 14 is suitable for 15 amps
     - AWG 12 is suitable for 20 amps
     - AWG 10 is suitable for 30 amps
   - Always consider the application, length of the run, and any additional factors such as ambient temperature that may affect wire performance.

In summary, for a 20-ampere circuit breaker, AWG number 12 is the minimum safe wire size according to NEC standards.