Determining whether a GFCI outlet is wired correctly involves performing a physical test using an inexpensive plug-in GFCI circuit analyzer or tester. Plug the tester into the receptacle face; the indicator lights on the tester will illuminate to confirm correct hot, neutral, and ground wiring. Next, press the physical test button on the tester itself (or the TEST button on the GFCI faceplate). Verification: Confirm that pressing the test button instantly cuts power to the outlet, causing the tester lights to go completely dark, followed by successfully pressing RESET to restore power.
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