When I find a GFI outlet that does not trip with my tester, I note it as defective. Sometimes I find them that will trip from the test button, but not from the tester.
Anyway, last week I noted one as not working, and ungrounded, in the garage of a recently flipped home.
The electricians response is as follows “the reason the GFI in garage does not trip is because, the existing wiring in the garage is ungrounded. This is the same situation as ungrounded 2 prong receptacles in older homes being changed to GFI’s to get the three-prong configuration. This is why the electrical inspector will allow these GFI’s though a GFI tester will not trip them.”
First of all, is that correct?
Secondly, and only if it is, how is a person protected? If my tester does not trip them, how will a fault?