The Definition of GFI
A Ground Fault Interrupter (GFI) is a type of electrical outlet that detects an imbalance of current and automatically trips a breaker when the imbalance reaches a specific level. The GFI is designed to protect against electrocution in high-risk areas, such as bathrooms, kitchens, outdoors and other high-use areas in your home. Does this Spark an idea?
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Types
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There are three basic types of ground fault interrupters: receptacle GFI outlets, which are used instead of a non-GFI outlet; circuit-breaker GFIs, which are located at the electrical panel box; and portable GFI's that are used between an appliance and an outlet. Some appliances, such as hair dryers, and even some electric cords have a GFI breaker built into the wiring, offering even more protection.
Function
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Ground fault interrupters work by sensing a loss of current in the circuit. For example, during an electrocution, the electrical current leaves the circuit and is grounded by an eternal source rather than the circuit's ground wire. When a GFI senses such a problem, the electrical current to the outlet is shut down almost immediately.
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Considerations:
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All GFI outlets should be tested once a month. To do this, plug in a night light and turn it on and press the "test" button on the outlet. The light should go out, the "test" button should stay indented and the "reset" button should pop out. Press "reset," and the "test" button should pop back out, the "reset" button should stay in and the night light should come back on. If anything is wrong with the outlet, replace it.
Benefits
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GFI outlets can save lives. In addition, if an appliance you use commonly trips the GFI breaker, you might want to consider replacing the appliance, because it probably has an electrical wiring problem. GFIs also protect against electrical fires if moisture gets into an outlet, reducing fire hazards in high-risk locations.
National Electrical Code
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The National Electrical Code requires that GFI outlets be used for all outdoor receptacles, garage receptacles, and unfinished basement and crawl space receptacles. Other areas include kitchen and bathroom receptacles. If any of your outlets in these areas are not GFI units, consider having them replaced by a qualified electrician.
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