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How do you test for GFCI protection at an ungrounded receptacle outlet?
Friday, February 28, 2020
If you are testing a GFCI receptacle outlet on an ungrounded (two wire) circuit, you can simply push the test button to verify that the GFCI is functional, and it will trip if working properly. But, to verify that other ungrounded (two slot) receptacles on the same circuit are also GFCI-protected, you need to trip the GFCI at the receptacle and check that the others are dead. You can also test receptacles on a circuit that has a GFCI-breaker in the panel the same way.
Unfortunately, a three-light circuit tester with a GFCI test button will not work on an ungrounded circuit because the tester needs to shunt some current to a ground wire—which is not there. To learn more, see our blog post Will a GFCI receptacle that is not grounded still function properly?
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