The information in that post is still mostly applicable today, but there are few nitty-gritty details missing from that post, and there have been a few code changes since I wrote that, making the repair for an ungrounded three-prong outlet a little bit more complicated.To start off, the third prong on a plug is for the ground wire, and its job is to bond electrical components.The reason I ask is I've read that the spec grade outlets receptacles have a metal plate on the back that connects the ground to bolts, which in turn will bolt to the metal housing.Basically it has a self grounding feature that grounds to the metal box.In my final walkthrough, I found that the electrician did not repair the open-grounded outlets I marked out , instead he installed two-pronged outlets.
If there is no ground wire the ONLY thing you can do is replace the receptacle with a GFCI receptacle.
If a three-prong outlet is installed with only two wires and no grounding path, we call it an ungrounded three-prong outlet.
This is a common defect at old houses, and sometimes at newer homes where some hack has been messing with the wiring.
The electrician cited as to why this method of repair is ok. I have a feeling that I may look back on this and ask myself why I posted such a stupid question )) Thanks for your positive and friendly input!
At first I thought he had you on a sneaky technicality. It's 406.3(D) 406.3 General Installation Requirements (D) Replacements (3) Nongrounding-Type Receptacles Where grounding means does not exist in the receptacle enclosure, the installation shall comply with (D)(3)(a), (D)(3)(b), or (D)(3)(c).(a) A nongrounding-type receptacle(s) shall be permitted to be replaced with another nongrounding-type receptacle(s).