Answer first
GFCI watches for current leaking to ground (shock risk near water). AFCI watches for dangerous arcing (fire risk in wiring). Modern homes often need both — in the right places.
01
Definition
What is this?
GFCI (ground-fault circuit interrupter) opens the circuit when it detects imbalance between hot and neutral. AFCI (arc-fault circuit interrupter) opens when it detects arcing signatures that can ignite insulation.
02
When to use
When does this apply?
Use GFCI near water and outdoors. Use AFCI on many living-area branch circuits per current code. Older homes often need targeted upgrades during remodel or outlet replacement.
03
Failure modes
What goes wrong?
Installing only decorative outlets in a wet location. Assuming a GFCI breaker covers AFCI needs. Resetting trips without finding the wet or damaged cause.
04
Proof
Why trust this guidance?
Hurst installs and troubleshoots GFCI and AFCI devices across Central Kentucky remodels and service calls — we place protection where the hazard actually lives.
05
Action
What should you do next?
If outlets trip, smell, or lack wet-location protection, request an outlet and circuit review.
Label which breaker or device protects each room so the next reset is informed.
Glossary
Key terms for this guide — full definitions live in the Hurst plumbing & electrical glossary.
Questions homeowners ask
FAQ
Can one device do both?
Combination AFCI/GFCI breakers exist for some applications. Placement still follows code and the hazard you are solving.
Why does my bathroom GFCI keep tripping?
Moisture, multi-wire shared neutrals, or a failing device. Do not bypass — diagnose.
Are AFCI required in older homes?
Often when circuits are modified or during substantial remodel. Full-house retrofit is situational.
Author & reviewer
Hurst Electric & Plumbing
Reviewed by Hurst Electric & Plumbing
Company-level review by the licensed Hurst plumbing and electrical team in Danville, KY — a dual-trade shop. Guidance reflects how we diagnose on-site, explain scope in writing, and close out under the Hurst standard. Last updated .