Hi I was recently installing a new ceiling fan and discovered that the circuit has an open ground, then discovered that all boxes in the circuit are open as well. I found two places in the attic where the ground wires were left un-spliced (looked like on purpose), thought that was it for sure but negative. So I assume that the ground is not connected where it originates, at the panel. Do I need to trace this cable (not very accessible) back to the panel to fix OR can I cut another run of cable (different circuit) in the attic with a known good ground, put in a junction box and tap into the ground, then run a single ground wire from that junction box to the three boxes with the open ground that are all fairly accessible?
In a properly wired system, all the splices should be contained in accessible junction boxes. You may just need to make the splices in the boxes and check the panel. Any metal boxes would also need to be bonded to the grounding conductor.
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