What Is an Electrical GFI?

How GFCI's Work

In an electrical outlet, a GFCI constantly monitors electricity flowing in a circuit, to sense any loss of current. If the current flowing through the circuit differs by even a small amount from that returning, the GFCI quickly switches off power to that circuit. The GFCI interrupts power in as little as 1/40th of a second to prevent a lethal dose of electricity. You may receive a painful shock but will not receive any serious injury. GFCI stops electrical current from flowing through your body from an appliance to an electrical ground.

Why GFCI's Are Required

It is well-known that the combination of electricity and water can be dangerous. For example, in the bathroom, grabbing a defective hair dryer while standing on a wet floor could be fatal without a GFCI to rapidly interrupt the current. The exteriors of some electrical appliances can sometimes become charged, and GFCI's can then help prevent electrocution, especially in areas such as a kitchen, where a person might be grounded by standing on a wet floor or touching a water faucet.

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