Ground Fault Circuit Interrupter GFCI's
The outlets with the colored "Test" and "Reset" buttons are specially designed to better protect people than ordinary outlets. GFCI's have been used in houses since the 1970's.
Why Are They Used?
GFCI's are designed to shut power off if there is a very small leak of electricity (a ground fault) which ordinary outlets wouldn't notice. Normal outlets are shut off by a fuse or breaker if more than 15 amps flows. This prevents fires, but since people can be killed by 1 amp or less, fuses may not protect people from shock. GFCI's shut off power if a leak as small as .005 amp occurs.
How Do They Work?
GFCI detects a leak by comparing how much electricity comes back
through the white wire to how much was sent in the black wire.
is working correctly, the current flow is the same. If a little electricity
is leaking out, it may be going through a ground wire or through
of the house. If this happens, the black wire will have more electricity
than the white wire. Electricity, like most people, will follow
path of least resistance. If a person touches a leaky electrical
system, they may present a better route to ground for electricity,
may offer very little resistance.
Where Are They Used?
In Canada, GFCI's are now required by Code for outdoor outlets, bathroom outlets and whirlpool outlets. Electrical systems for swimming pools are also GFCI protected. In the United States, kitchen outlets within six feet of the sink must also be GFCI protected.
Can The Outlet Be GFCI Protected If There Is No Button?
Yes, if for example, the circuit breaker back at the panel has a "Test" button, it is a GFCI breaker. This will protect everything on that particular circuit. Any outlets wired downstream of a GFCI outlet are also protected if the GFCI is wired correctly.
Can They Be Added To Older Houses?
GFCI's can be added to any electrical system. They are more
than regular outlets ($15-$20 vs. $1-$2), but are inexpensive insurance.
While they do not replace grounding systems exactly, some Codes
allow GFCI's in lieu of grounding in some cases. It is safe to say
that a circuit protected by a GFCI is better protected than
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