*Question G0B03:
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?*  

*Correct Answer is  D: 15 amperes*  

### AI Response: (may contain errors)  

In electrical systems, the size of the fuse or circuit breaker is determined by the current-carrying capacity of the wire used in the circuit. For AWG (American Wire Gauge) number 14 wiring, the National Electrical Code (NEC) specifies a maximum current capacity of 15 amperes. This is to ensure safety and prevent overheating of the wire, which could lead to insulation damage or fire.

### Explanation:

1. **Correct Answer: 15 amperes (Choice D)**
   - AWG 14 wire is rated for a maximum of 15 amperes. Using a fuse or circuit breaker rated for 15 amperes ensures that the circuit is protected from excessive current that could cause overheating.

2. **Why Other Choices Are Incorrect:**
   - **30 amperes (Choice A):** This rating is too high for AWG 14 wire. It would allow more current than the wire can safely handle, risking overheating and potential fire hazards.
   - **25 amperes (Choice B):** Similar to 30 amperes, this rating exceeds the safe current-carrying capacity of AWG 14 wire.
   - **20 amperes (Choice C):** Although closer, this is still above the 15-ampere rating for AWG 14 wire and could lead to overheating.

### Useful Rule of Thumb:

- **AWG 14 Wire:** Maximum safe current is 15 amperes.

By adhering to these guidelines, you ensure that the circuit is protected and operates safely within the limits of the wire's capacity.