Can AFCI outlets be used on the two wire circuits found in older homes? June 11, 2021 17:01 Updated Follow Yes, AFCI outlets can be used in older homes that contain two wire circuits. Related articles How many outlets are protected downstream from an AFCI outlet? AFCI NEC® Code Requirements Will an AFCI protect what I have plugged into the outlet? Are Leviton AFCI outlets UL listed? Are AFCI outlets required by the electric code?