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For more than a generation, localities have been strengthening their building codes to require that electrical outlets that are outdoors or in kitchens, bathrooms, and basements have ground-fault circuit interrupters, or GFCIs. They're supposed to interrupt power instantly if electrical current leaks from its proper path, reducing the risk of shock or electrocution.
The National Electrical Manufacturers Association estimates that about 9 percent of GFCIs in homes aren't working. That's why it's important to test all GFCI outlets in your house, especially GFCI circuit breakers, once a month.
Testing a GFCI device takes seconds. Plug in a lamp or small appliance, turn it on, and press the test button. That should cut power at the outlet. If it doesn't, you have a malfunctioning or ...