I live in a house that has significant issues. Here's the current one I'm wondering about.
This electrical outlet box seems to be "live". There is 120v voltage running between one of the electrical lines and the box. No voltage exists between the two wires, or between the other wire and the box. What is going on here? Would this exist because it was originally knob and tube before an upgrade to BX-cable? (I don't see any lot of knob-and-tube though) Just how unsafe is this - can it be closed up and grandfathered in as this is all pre-existing?
How would I test for where the break in the insulation is (thereby causing the neutral or hot wire to run through the armored cable housing)?
Here's a full set of photos of the situation. https://photos.app.goo.gl/PDBPdcyjYsZ1gFh3A