Oklahoma Electrical Practice Exam

A branch circuit providing a 15 amp, 125v circuit to a residential bedroom will be protected by what type?

1. Circuit breaker

2. Fuse protection

3. Arc fault protection

4. Surge protection

The correct answer is: Arc fault protection

In a residential setting, especially in bedrooms, the National Electrical Code (NEC) mandates the use of arc-fault circuit interrupters (AFCIs) to enhance safety. AFCIs are designed to detect and interrupt arcing faults, which can occur due to damaged wiring or connections and are a common cause of electrical fires. By specifically requiring arc-fault protection for branch circuits in living spaces, the code aims to mitigate the risk of potential hazards associated with electrical arcing. A circuit breaker and fuse protection serve different functions primarily related to overcurrent protection—preventing overloads and short circuits. They do not specifically address the unique risks posed by arcing faults in residential environments. Surge protection generally pertains to safeguarding electrical devices from voltage spikes rather than providing ongoing protection for the circuit itself. Thus, the requirement for arc-fault protection in a 15 amp, 125v circuit in a bedroom aligns with current safety standards, ensuring the protection of both the electrical system and the inhabitants of the home.