AFCI, GFCI, and Dual-Function Protection Explained

What each device is designed to detect

An arc-fault circuit interrupter, or AFCI, detects certain dangerous arcing conditions that can lead to fire. A ground-fault circuit interrupter, or GFCI, monitors an imbalance between outgoing and returning current and interrupts power to reduce the risk of severe shock. These protections serve different purposes. Neither label means that damaged equipment is safe to keep using.

Combination and dual function mean different things

A combination-type AFCI addresses both series and parallel arcing. The word combination does not, by itself, mean that GFCI protection is included. A dual-function AFCI/GFCI device provides both arc-fault and ground-fault protection. Protection can be provided through different equipment arrangements, so a receptacle’s appearance alone does not establish everything protecting that circuit.

• Ask which protection is present, where it is provided, and which outlets or loads it covers.
• Ask the electrician to identify the exact device and provide its operating and testing instructions.

Testing and upgrade planning

Follow the manufacturer’s instructions for the device’s user test function. CPSC recommends testing GFCIs at least monthly and after a power failure. If a test fails or a device repeatedly trips, stop using the affected equipment and arrange evaluation instead of repeatedly resetting it. Installation and circuit changes belong with a qualified electrician.

Planning the work with Ai Builders Electric

We review the existing equipment, the circuit use and the work being proposed before specifying protective devices. A kitchen remodel, an added circuit and an existing outlet that has stopped working can involve different decisions. Ask for the exact protection and device models to be identified in the scope.

Common questions