Which device protects 120-volt bedroom circuits in new dwellings?

• A. Arc Fault Circuit Interrupter
• B. Ground Fault Circuit Interrupter
• C. Overcurrent Protector
• D. Surge Protector

Answer: (A)

Arcing in electrical wiring can start fires even when nothing seems wrong, so protecting against arc faults is essential. An Arc Fault Circuit Interrupter detects the distinctive current patterns produced by arcing and quickly disconnects the circuit to prevent a fire. In new homes, 120-volt bedroom circuits are required to have AFCI protection to reduce fire risk in living areas where people spend time. This is different from a ground fault interrupter, which stops dangerous shocks from ground faults but doesn’t address arcing; an overcurrent protector mainly stops overloads without sensing arc behavior; and a surge protector guards devices from voltage spikes but isn’t a circuit-fire-prevention device.