Where are arc-fault circuit interrupters (AFCIs) commonly required?

Arc-fault circuit interrupters (AFCIs) are commonly required in bedroom circuits because they are designed to protect against arc faults, which occur when there is an unintentional electrical discharge in the circuit. These types of faults can lead to fires if not interrupted quickly. Bedrooms, being private spaces where electrical usage may involve bedding and other flammable materials, are particularly susceptible to the dangers posed by arc faults, making AFCIs an important safety feature in this area.

While AFCIs can be beneficial in other areas such as kitchens and living rooms, the National Electrical Code specifically emphasizes their installation in bedrooms to enhance safety in residential settings. In contrast, outdoor circuits typically do not require AFCIs, as they are subject to different conditions and hazards that are not specifically addressed by the use of AFCIs.