I have a groundless outlet that I'm attempting to add a ground to. The breaker that this circuit is tied to is a one pole AFCI, and it seems this is the only outlet on the circuit for the time being. (Unsure where the cut wires lead, but we'll get to that later)
It would appear the outer jacket has some sort of bare copper in contact directly with the box, but attempting to tone the bare copper or metal junction box does not seem to produce a tone at other outlet ground receptacles in the room (for functioning outlets). Although I'm unsure if you can tone grounds in general.
When the receptacle is in place, my voltage proximity tester gives a very pronounced signal from about a foot away, but I'm unsure if this is just a standard reading for an ungrounded outlet. My multimeter shows ~40vac between the box and hot when the receptacle is hot, so I'm just generally confused here at what's going on.
I toned the cut wires and tested another location in the room where inactive floor outlets are, but no signal. And testing their voltage while the circuit is hot produces 0vac. So I can only assume these are buried somewhere due to an old renovation, especially as this box is on a wall shared with another unit.
So it seems the box isn't grounded, but if so, why is the bare copper touching the box, and what does 40vac between the box and the hot terminal mean? I'd guess the next step would be to take the panel face off and check for this wire's ground, but I still feel a little too confused to proceed.