These two devices get lumped together because they live in the same slot and cost about the same. They do different jobs, and knowing which is which tells you what a trip is actually reporting.
GFCI protects people
A ground-fault device compares what goes out on the hot against what comes back on the neutral. If a few milliamps go missing, something is carrying current that should not be, and in a wet location that something may be a person. It cuts in a fraction of a second.
That is why code puts them in kitchens, bathrooms, garages, basements, outdoors, and anywhere near water. It is the difference between a shock and an electrocution.
AFCI protects the building
An arc-fault device is listening for the electrical signature of arcing: a damaged cord, a nail through a cable, a loose terminal chattering inside a box. Those arcs do not draw enough current to trip a normal breaker, but they are what starts fires inside walls.
Both devices are more sensitive than a standard breaker by design. Before writing one off as oversensitive, it is worth finding out what it is reacting to. Sometimes it is a failing appliance you did not know was failing.
Testing them
Press the test button monthly. If the device does not trip when tested, or will not reset afterwards, it has failed and it is protecting nothing. They wear out like anything else, and a dead GFCI in a bathroom is worth replacing the week you find it.
Where code puts each one
GFCI protection goes wherever water and electricity share a room: kitchen counters, bathrooms, garages, unfinished basements, crawl spaces, outdoors, and anywhere within reach of a sink. AFCI protection covers most living-space circuits (bedrooms, living rooms, hallways) because those are the circuits running inside walls behind furniture.
Requirements have expanded with each code cycle, and Illinois municipalities adopt those cycles on their own schedules. A house wired in 1998 is not non-compliant for lacking devices that were not required then, but any circuit you extend or replace generally has to meet current code.
- Press TEST. The device should trip and kill the outlet.
- Press RESET. It should hold.
- If it will not trip, it is protecting nothing. Replace it.
- If it will not reset, something downstream is faulting. That needs finding.
- Devices wear out. A dead GFCI in a bathroom is worth replacing the week you find it.
A device that trips for no apparent reason is usually reacting to something real.
Questions we get about this
What is the difference in one sentence?
GFCI protects people from shock by detecting current leaving the circuit; AFCI protects the building from fire by detecting the signature of arcing.
My GFCI trips every time it rains. Normal?
No, and it is telling you something real. Water is getting into an outdoor device, a cover has failed, or a buried cable is damaged. The device is doing its job; the cause needs finding.
Can I replace a GFCI myself?
It is a common DIY job and a common source of the faults we get called about, usually line and load reversed so the device protects nothing downstream. Test it afterwards with a tester that confirms the protection works.
Do I need AFCI in an older house?
You are not required to retrofit an entire older house, but any circuit you extend or replace generally has to meet current code. Many people add them during a panel replacement.
How we price and schedule this
We look before we quote. That means somebody comes out, opens the panel, and finds out what is actually behind the wall. Quoting a job like this over the phone produces a number that changes, and a number that changes is worse than no number at all.
What you get is written, itemized against a defined scope. If we open something up and the scope genuinely changes, we stop and tell you before carrying on. Emergencies get same-day attention; scheduled work usually starts within a few days, though anything needing a permit or a utility disconnect runs on the village calendar and ComEd’s as well as ours. We will tell you at the quote which parts we control and which we do not.
What done looks like
The work gets tested, the circuits get labeled properly in the panel, and the site gets cleaned up behind us. Labeled panels matter more than people think, because the next person working on that system is reading your labels to decide what is safe to touch. Where a permit was pulled you get the closed inspection, and where documentation exists, you get it.
Why the permit and the inspection matter here
Illinois municipalities adopt the National Electrical Code on their own schedule, so the rules in one village are not always the rules in the next one over, and permit thresholds differ too. Some places want a permit for a single new circuit; others only for a service change or a panel replacement. We deal with whichever jurisdiction the job sits in rather than guessing, which is part of what you are hiring.
The inspection is not a formality to get through. It is an independent check that what went behind the drywall matches what was supposed to, carried out by somebody with no stake in the invoice. It also puts the work on the public record for the address, which is what a buyer, a buyer’s inspector or an insurer will eventually ask about.
Who does the work
Quik Wire Electric is a licensed Illinois electrical contractor and we carry insurance on every job. Where the village requires a permit we pull it and we meet the inspector, so the work goes on the public record for the address rather than living only in your memory.
The same licensed electricians turn up whether the job is one dead outlet in a bungalow or switchgear in a village facility. We do not run a separate B-team for small work and we do not subcontract the parts nobody wants. You get told who is coming and roughly when, and if we are running late you get a call.
We work out of Des Plaines and cover 24 Illinois counties, from Cook and Lake through DuPage, Kane, McHenry and Will and out to Winnebago, LaSalle and Champaign. The full service area is here if you want to check whether your address is on it.
Room by room in a Belvidere house, GFCI installation in Belvidere lists which circuits need protection and how we prove each device trips.
Getting nuisance trips?
A device that trips for no apparent reason is usually reacting to something real. Worth a look.
Talk to an electrician