I just replaced a few two-prong outlets with GFCI outlets so we can plug in things built this millennium. Two of the outlets read "correct" on my circuit tester, but one reads "open ground." None of the outlets are grounded, so I don't know why this one would read differently. Anyway, does this matter? Should I bother to do something to fix it?
Electrical – Does it matter if the newly installed GFCI reads “open ground”
electricalgfcireceptaclewiring
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Best Answer
No. In fact, GFI protection is a safe and legal way to install 3-prong receptacles on non-grounded wiring.
You are likely reading a ground in some area because armored cable will show a ground with a tester but it is NOT a safe or acceptable means of ground in all cases. Only one type of AC cable will provide an acceptable ground.