What is the maximum ampacity allowed for a circuit with a 15-amp protection?

The maximum ampacity allowed for a circuit protected by a 15-amp circuit breaker is indeed 15 amps. This is because the purpose of the protection device, such as a circuit breaker, is to prevent the circuit from carrying more current than it is rated for, which helps to avoid overheating and potential fires.

When a circuit is protected by a 15-amp breaker, that breaker will trip if the current exceeds 15 amps, ensuring the safety of the wiring and the connected devices. While other options represent ampacity ratings greater than 15 amps, they exceed the capability of the circuit as defined by its protection, potentially leading to dangerous conditions if they were allowed to operate on a 15-amp breaker.

Thus, maintaining a maximum ampacity of 15 amps aligns with electrical safety standards and the principle of protecting the circuit effectively.