One type contains the GFCI circuitry in a self-contained enclosure with plug blades in the back and receptacle slots in the front. It adds flexibility in using receptacles that are not protected by GFCIs. Once a GFCI is installed, it must be checked monthly to determine that it is operating properly. If the GFCI does not disconnect the power, place a call into a qualified, certified electrician. More than 18 billion UL Marks appear on products each year.
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