NEMA has published NEMA ABP 11-2016 Compatibility between Smoke Alarms and Arc-Fault Circuit Interrupters. Purpose of paper is to explain that an arc-fault circuit interrupter provides increased fire protection for electrical installation. There is no evidence that the circuit supplying smoke alarms should be exempt from these increased protection requirements. Power supply reliability for smoke alarms is not impacted by the installation of an AFCI.