Electrical Inspection, Testing and Certification Practice Exam 2026 – Comprehensive All-in-One Guide for Exam Success!

AFCI stands for Arc Fault Circuit Interrupter, and its primary purpose is to protect against electrical fires that can result from arc faults. An arc fault occurs when there is an unintended electrical discharge that can happen due to damaged wires, loose connections, or deteriorating insulation. This discharge generates heat which, if not interrupted, can ignite surrounding materials and lead to a fire.

AFCIs detect these arc faults by monitoring the electrical current and identifying signatures that signify an arc has occurred. Once an arc is detected, the AFCI interrupts the circuit, thereby cutting off the electrical supply and reducing the risk of a fire.

The designation of AFCI is critical in residential wiring, particularly in areas such as bedrooms, living rooms, and other common areas where electrical devices are used frequently. Their installation contributes significantly to enhancing electrical safety in homes, making them a fundamental part of modern electrical code requirements.