GFCI protection

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Ground Fault Circuit Interrupter (GFCI)

A "GFCI" is a ground fault circuit interrupter. A ground fault circuit interrupter is an inexpensive electrical device that,
if installed in household branch circuits, could prevent over two-thirds of the approximately 300 electrocutions still
occurring each year in and around the home. Installation of the device could also prevent thousands of burn and
electric shock injuries each year. The GFCI is designed to protect people from severe or fatal electric shocks
Because a GFCI detects ground faults, it can also prevent some electrical fires and reduce the severity of others by
interrupting the flow of electric current.

THE PROBLEM
Have you ever experienced an electric shock? If you did, the shock probably happened because your hand or some
other part of your body contacted a source of electrical current and your body provided a path for the electrical
current to go to the ground, so that you received a shock. An unintentional electric path between a source of current
and a grounded surface is referred to as a "ground-fault." Ground faults ground-fault. Ground faults occur when
current is leaking somewhere, in effect, electricity is escaping to the ground. How it leaks is very important. If your
body provides a path to the ground for this leakage, you could be injured, burned, severely shocked, or electrocuted.

Some examples of accidents that underscore this hazard include the following:

Two children, ages five and six, were electrocuted in Texas when a plugged-in hair dryer fell into the tub in
which they were bathing.
A three- year-old Kansas girl was electrocuted when she touched a faulty countertop.

These two electrocutions occurred because the electrical current escaping from the appliance traveled through the
victim to ground (in these cases, the grounded plumbing fixtures). Had a GFCI been installed, these deaths would
probably have been prevented because a GFCI would have sensed the current flowing to ground and would have
switched off the power before the electrocution occurred.

HOW THE GFCI WORKS
In the home's wiring system, the GFCI constantly monitors electricity flowing in a circuit, to sense any loss of current.
If the current flowing through the circuit differs by a small amount from that returning, the GFCI quickly switches off
power to that circuit. The GFCI interrupts power faster than a blink of an eye to prevent a lethal dose of electricity.
You may receive a painful shock, but you should not be electrocuted or receive a serious shock injury.

Here's how it may work in your house.. Suppose a bare wire inside an appliance touches the metal case. The case is
then charged with electricity. If you touch the appliance with one hand while the other hand is touching a grounded
metal object, like a water faucet, you will receive a shock. If the appliance is plugged into an outlet protected by a
GFCI, the power will be shut off before a fatal shock would occur.

AVAILABILITY OF GFCIs
Three common types of ground fault circuit interrupters are available for home use:

RECEPTACLE TYPE

This type of GFCI is used in place of the standard duplex receptacle found throughout the house It fits into the
standard outlet box and protects you against "ground faults' whenever an electrical product is plugged into the outlet
Most receptacle-type GFCls can be installed so that they also protect other electri-cal outlets further "down stream"
in the branch circuit.

CIRCUIT BREAKER TYPE

In homes equipped with circuit breakers rather than fuses, a circuit breaker GFCI may be installed in a panel box to
give protection to selected circuits The circuit breaker GFCI serves a dual purpose - not only will it shut off electricity
in the event of a "ground-fault," but it will also trip when a short circuit or an over-load occurs Protection covers the
wiring and each outlet, lighting fixture, heater, etc served by the branch circuit protected by the GFCI in the panel
box.

PORTABLE TYPE

Where permanent GFCls are not practical, portable GFCls may be used One type contains the GFCI circuitry in a
plastic enclosure with plug blades in the back and receptacle slots in the f rant. It can be plugged into a receptacle,
then, the electrical product is plugged into the GFCI. Another type of portable GFCI is an extension cord combined
with a GFCI. It adds flexibility in using receptacles that are not protected by GFCls.

WHERE GFCIs SHOULD BE CONSIDERED
In homes built to comply with the National Electrical Code (the Code), GFCI protection is required for most outdoor
receptacles (since 1973), bathroom receptacle circuits (since 1975), garage wall outlets (since 1978), kitchen
receptacles (since 1987), and all receptacles in crawl spaces and unfinished basements (since 1990).

Owners of homes that do not have GFCls installed in all those critical areas specified in the latest version of the
Code should consider having them installed. For broad protection, GFCI circuit breakers may be added in many
panels of older homes to replace ordinary circuit breaker. For homes protected by fuses, you are limited to
receptacle or portable-type GFCIs and these may be installed in areas of greatest exposure, such as the bathroom,
kitchen, basement, garage, and outdoor circuits.

A GFCI should be used whenever operating electrically powered garden equipment (mower, hedge trimmer, edger,
etc.). Consumers can obtain similar protection by using GFCIs with electric tools (drills, saws, sanders, etc.) for do-it-
yourself work in and around the house.

INSTALLING GFCIs
Circuit breaker and receptacle-type GFCIs may be installed in your home by a qualified electrician. Receptacle-type
GFCIs may be installed by knowledgeable consumers familiar with electrical wiring practices who also follow the
instructions accompanying the device. When in doubt about the proper procedure, contact a qualified electrician. Do
not attempt to install it yourself. The portable GFCI requires no special knowledge or equipment to install.

TESTING THE GFCIs
Receptable Type GFCI All GFCIs should be tested once a month to make sure they are working properly and are
protecting you from fatal shock. GFCIs should be tested after installation to make sure they are working properly and
protecting the circuit. To test the receptacle GFCI, first plug a nightlight or lamp into the outlet. The light should be
on Then, press the "TEST" button on the GFCI. The GFCI's "RESET" button should pop out, and the light should go
out.
If the "RESET" button pops out but the light does not go out, the GFCI has been improperly wired. Contact an
electrician to correct the wiring errors.

If the "RESET" button does not pop out, the GFCI is defective and should be replaced.

If the GFCI is functioning properly, and the lamp goes out, press the "RESET" button to restore power to the outlet.