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Does GFCI still work on an ungrounded receptacle outlet?
Thursday, February 27, 2020
Yes, a GFCI at an ungrounded receptacle will still trip under a ground fault, and it will protect any other receptacles downstream in the circuit. The test button will also work to verify that the GFCI is functioning properly, but the receptacle should be marked with one of the small “NO EQUIPMENT GROUND” stickers that come in the box with the GFCI receptacle. Also, a GFCI breaker in the panel will also protect any ungrounded receptacles on its circuit.
Although a ground is not necessary for a GFCI to work, an ungrounded receptacle cannot be tested for GFCI protection with a 3-light plug-in tester because it has to be able to shunt a little current to ground to do the test. Also, see our blog post Can you plug a surge protector into a two prong outlet?
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