I’ve had two inspections within the last month where my simple tester showed unusual light indications. In both cases I’ve referred to a licensed electrical contractor for further evaluations/repairs. However, I would like to know what is going on.
Here’s the situation. In both cases, the homes were built in the late 40’s early 50’s with NM 2 conductor cable (ungrounded). A 3 prong receptacle was installed using 14/2 with ground although there is no grounding conductor that would terminate in the service panel. In one case, the branch wiring was encased with armored cable. In the other it was not.
All three indicator lights lit but the center light was very bright indicating an ungrounded circuit. However the left and right lights also were energized albeit much dimmer than the center light.
I’m just looking for an explanation as to the reason for this result. Any suggestions?