How Does a GFCI Outlet Work?

GFCI outlet
The GFCI type of outlet constantly monitors electricity flowing in a circuit, to sense any loss of current. leah613/Thinkstock

Every year, hundreds of Americans die due to electrical accidents called electrocution – death caused by electric shock. Sometimes electrocution happens in utility and construction incidents, but these tragic accidents happen in homes, too. Before the widespread adoption of GFCI (ground-fault circuit interrupter) outlets, around 800 people died annually in the United States. Now, thanks largely to the proliferation of GFCI technologies, particularly in areas near water, such as bathroom sinks or in places exposed to rain or standing water, that number has dropped to around 200 deaths per year [sources: Nickel Electric, Fish, at al.].

In short, GFCI outlets exist to protect people from electrical shock — it is completely different from a house fuse. The idea behind a fuse is to protect a structure from an electrical fire. If the hot wire were to accidentally touch the neutral wire for some reason (say, because a mouse chews through the insulation, or someone drives a nail through the wire while hanging a picture, or the vacuum cleaner sucks up an outlet cord and cuts it), an incredible amount of current will flow through the circuit and start heating it up like one of the coils in a toaster. The fuse heats up faster than the wire and burns out before the wire can start a fire. Catastrophe averted.


Unlike a home's fuse, the GFCI is integrated in the outlet itself. When you plug in an appliance, such as a hair dryer, the GFCI outlet monitors the amount of power going to the device. If you accidentally drop the appliance into sink full of water, the GFCI detects the interruption in current and cuts the power ... and possibly saves your life.

So how do you know if you're looking at an outlet equipped with GFCI capabilities? You'll see a Test and a Reset button (and perhaps an indicator light) built right into the outlet.

When you view a normal 120-volt outlet in the United States, there are two vertical slots and then a round hole centered below them. The left slot is slightly larger than the right. The left slot is called "neutral," the right slot is called "hot" and the hole below them is called "ground." If an appliance is working properly, all electricity that the appliance uses will flow from hot to neutral. A GFCI monitors the amount of current flowing from hot to neutral. If there is any imbalance, it trips the circuit. The GFCI senses a mismatch as small as 4 or 5 milliamps, and it can react as quickly as one-thirtieth of a second. That's a key specification, because at around 10 milliamps, human muscles "freeze" from electrical overload, meaning that you're unable to let go of an object that's causing a shock; just two seconds at that level of current can cause death [source: ELCOSH].


Checking the Two Buttons on a GFCI Switch

If you've ever experienced even a second of paralysis caused by electrical shock, it's not a feeling you'll ever forget. In short, you were part of what's called a ground fault.

A ground fault is an instance in which the hot wire touches any area of a grounded device or even the grounded part of a junction box. It can happen in situations when wiring insulation is damaged, perhaps to the mischievous teeth of rodents, or even due to wiring age, or, very commonly, environmental conditions [source: Littelfuse].


Moisture and dampness are two of the biggest causes of ground faults, and the consequences can be life-altering. For example, let's say you are outside with your power drill and it is raining. You are standing on the ground, and since the drill is wet there is a path from the hot wire inside the drill through you to the ground. If electricity flows from hot to ground through you, the result is a ground fault, and it could be fatal. The GFCI can sense the current flowing through you because not all of the current is flowing from hot to neutral as it expects -- some of it is flowing through you to the ground. As soon as the GFCI senses this "leakage" of power, it trips the circuit and cuts off the electricity.

On a final note, understand that GFCI outlets always eventually wear out, so you should test them about once per month [source: McGarry and Madsen]. To test the outlet, press the Reset button, and then plug in a simple night light or other electrical device. The device should turn on. Then press the Test button. If the GFCI is working, the power will immediately be cut. Press Reset again, and your device should turn on again. If so, the outlet is working as it should.

If the light doesn't turn off when you press Test, you have a problem. The GFCI might be improperly installed or malfunctioning, and it won't protect you from shocks. You'll need to replace it or call a professional electrician for help.

You might get about 10 years of use from GFCIs. Realize that older units may fail "closed," meaning they'll still conduct electricity, obviously a dangerous situation that defeats the whole purpose of CFGIs. Fortunately, newer styles fail "open," meaning they'll no longer work, but they won't be a health hazard, either. Either way, test these devices regularly and you'll have extra peace of mind in the family bathroom and beyond.


GFCI Outlets FAQ

What is the purpose of a GFCI outlet?
The GFCI outlet, or ground-fault circuit interrupter, is a circuit breaker that is designed to block electric power in the event of a ground-fault in under 1/40th of a second. The term GFCI and GFI are interchangeable.
Can a GFCI outlet fail?
Although GFCI outlets are engineered to last up to 15 years before they start to falter, some can fail in as little as 5 years. If a GFCI outlet doesn’t reset, it’s probably because it has failed.
How do you troubleshoot a GFCI outlet?
Troubleshooting GFCI outlets is simple. Unplug everything, reset the outlet, and then plug your device back into the outlet to see if it works again or if it trips.
Can I install a GFCI outlet myself?
It is possible to install a GFCI outlet yourself. All you need is a new GFCI outlet and an outlet plate. You’ll need a flat head screwdriver top remove the outlet plate and old electrical outlet. The same screwdriver can be used to install the GFCI outlet and tighten the connections.
Do I need a weather-resistant GFCI?
Certain GFCI outlets are designed to be weather resistant, which are marked with the letters "WR". These outlets are designed with materials that resist corrosion, and the effects of snow, ice, moisture and humidity.

Lots More Information

Related Articles

More Great Links

  • Electronic Library of Construction Occupational Safety & Health. "Electrical Safety: Safety & Health for Electrical Trades." January 2002. (April 19, 2018)
  • Fish, Raymond and Geddes, Leslie. "Conduction of Electrical Current to and through the Human Body: A Review." NCBI. Oct. 12, 2009. (April 19, 2018)
  • Littelfuse. "What is a Ground Fault?" (April 19, 2018)
  • McGarry and Madsen Home Inspection. "What is the Average Life Expectancy of a GFCI Receptacle?" (April 19, 2018)
  • Nickel Electric. "Electrical Safety Statistics." May 27, 2015. (April 19, 2018)