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What's a GFCI? A GFI, or GFCI stands for Ground Fault Circuit Interrupter.
What does it do? It is a device that senses the amount of current (amperage) that is flowing out on the ungrounded conductor (the hot), and compares it to the amount of current returning on the grounded conductor (the neutral). If there is the slightest difference, (as little as one half a milliamp) the circuitry inside the device shuts itself down in as little as 1/40 of a second. It will protect you from being electrocuted if you are ever unfortunate enough to some how come into contact with a live conductor.
Do I need one? Since 1973, The National Electric Code has been increasing the locations that are required to be protected by GFCI's. These locations pertain to dwelling units. All outside receptacles, kitchen counter top receptacles, wet bar counter top receptacles within 6 foot of the sink, bathroom receptacles, and any receptacles in unfinished basements, garages, outbuildings, crawl spaces, and boat houses. If you do not have them installed in these areas, you do not have to run right out and do so. But for safety’s sake, it is recommended that you consider it. It also may come up if you are trying to sell your home, some municipalities are requiring them before you can make the sale.
What types are there? They come in 2 basic forms:
Receptacle- These come in different colors, and you just place them where you would any other receptacles. They are quite large though, so you have to watch the box size you are putting it in. It is always best to use a deep box when ever possible. These can also protect other outlets that are down stream of the device, that is, connected to the "load" terminals of the GFCI.
Breaker-This is just as it says, a breaker that is installed directly into the panel. It protects the entire circuit that the breaker feeds. This is not always desirable, as all GFCI's can be temperamental devices, and certain things like to set them off unnecessarily.
Operation When the device senses a potential shock occurring, it "trips" out and shuts off power to itself and whatever it is feeding. You must then press the reset button to re- energize the device. It is also recommended that you test them monthly by pressing the TEST button located on the device. The are known to fail occasionally, so it is good to make sure they are operating correctly, and you are your family are protected properly.
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