What is AFCI?
An AFCI is an arc-fault circuit interrupter that helps protect a circuit from dangerous electrical arcs. An arc is electricity jumping across a gap, sometimes because of damaged wiring or a loose connection. The device cuts power when it detects a potentially hazardous arc.
Quick Facts About AFCI
- Category
- Electrical protection device
- Used for
- Hazardous arc detection
- Common confusion
- Ground-fault protection
- Also called
- Arc-Fault Circuit Interrupter
- Often discussed with
- Electrical Panel Upgrade, Electrical Troubleshooting
Key Takeaways About AFCI
- AFCI protection responds to patterns linked to hazardous arcing.
- An AFCI breaker fits inside an electrical panel.
- A GFCI addresses a different electrical hazard.
How AFCI Works
An AFCI monitors electrical current for patterns associated with hazardous arcs. Its sensing circuit compares those patterns with normal activity on the circuit. A switch can create a brief arc during normal use, so the device must distinguish that activity from a fault. Related service: Electrical Panel Upgrade.
Related glossary terms: Electrical Arcing, Branch Circuit, Breaker Panel.
Damaged insulation can allow an arc between wires. A loose connection can also create arcing along a wire's path. The device responds to patterns associated with these faults and opens the circuit.
A GFCI detects current leaking from its intended path, which can signal a shock hazard. AFCI and GFCI protection address different problems. Some devices combine both functions.
From the Earth Electric team
When we plan an electrical panel upgrade, we check which circuits need AFCI protection. We also check that the selected breakers match the new panel and the circuit wiring. Shared neutral wires can affect breaker selection.
AFCI in Practice: A Real-World Example
During a panel upgrade, a home has a bedroom circuit with damaged wiring. An AFCI breaker may trip when it detects a hazardous arc, prompting an inspection of the circuit.
Related Terms
Electrical Arcing
Electrical Arcing is an electrical discharge that occurs when current crosses a gap through air or another material.
Branch Circuit
A branch circuit is an electrical circuit that runs from the final circuit breaker or fuse to the outlets or equipment it supplies.
Breaker Panel
A breaker panel is an electrical enclosure that distributes power to circuits in a building.
GFCI
A GFCI is a ground-fault circuit interrupter that helps protect people from electric shock.
Earth Electric
Have Questions About AFCI?
Contact Earth Electric for practical guidance on AFCI and related 24 hour electrician work in Miami.