Can an arc fault happen inside an appliance cord?

Yes, an arc fault can occur inside a damaged appliance cord. Bending or wear can damage conductors or insulation without leaving an obvious mark on the outside.

Does every spark mean there is an arc fault?

No, a spark doesn't always mean there's an arc fault. Some switches and motors produce brief arcs as part of their normal operation.

Can an arc fault produce a sound?

Yes, an arc fault can produce a crackling or buzzing sound. The sound may come from an outlet, a switch or another part of the circuit.

Glossary

What Is an Arc Fault?

An arc fault is an unintended electrical discharge that travels through air between conductors or across a damaged connection. It can occur in a wire, cord, outlet or other part of a circuit. The discharge produces heat and can ignite nearby materials, creating a fire hazard.

Quick Facts About Arc Fault

Category: Electrical fault
Applies to: Wiring and electrical connections
Common confusion: Arc fault circuit interrupter
Also called: Electrical Arcing, Arcing fault
Often discussed with: Emergency Electrical Repair, Electrical Wiring Repair

Key Takeaways About Arc Fault

An arc fault isn't the same as a ground fault.
A tripped protective device calls for investigation.
An arc fault isn't the protective device itself.

How Arc Fault Works

Two burned electrical wires spark where their exposed ends meet near a metal connector

An arc fault occurs when electricity jumps across a gap along an unintended path. A loose connection can create that gap. Damaged insulation can also expose a path between conductors. Related service: Emergency Electrical Repair.

Related glossary terms: Arc Fault Circuit Interrupter, Ground Fault, Circuit Breaker.

The electrical current in an arc can change rapidly. An arc fault circuit interrupter, or AFCI, monitors a circuit for patterns that may signal an unwanted arc. It can shut off power when it detects a pattern it identifies as hazardous.

Some normal electrical equipment also produces arcs during use. An AFCI is designed to distinguish normal patterns from those associated with hazardous arcing. A trip points to a condition worth checking, but it doesn't pinpoint the damaged part.

Two men in caps work on wiring in a dim utility space, one holding pliers near a bright spark

From the GMB Electric team

When we respond to an emergency electrical repair, we look beyond the tripped device. We check the affected circuit and connected equipment for signs of damage. The source may be in a cord or connection, so the repair depends on what we find.

Arc Fault in Practice: A Real-World Example

A homeowner notices a burning smell near an outlet and requests emergency electrical repair. An electrician finds a damaged connection with signs of arcing and repairs the affected wiring.