I didn't take the picture, but the Electrical Inspector who did, told me that the connection was loose and that the load, whatever it was, caused the wire to burn up.
This would be a typical situation at any termination not tightened properly.
Please take a 2-wire circuit under a load such as a lamp with a large bulb, and use your amprobe to see if the white wire is carrying any current .... I will await for your reply, and if you can send the picture I will post it here.
I am unable to do this now because I don't have an amprobe and I am in a hotel meeting room.
I always challenge my students, asking if they want to take odds that the "neutral" in any panel, were the load is unbalanced will produce a voltage.
Joe Tedesco, NEC Consultant
Re: The death of a very loose grounded conductor!#104647 09/18/0303:28 PM09/18/0303:28 PM
Just guessing, but it looks like someone terminated 2 conductors under one screw, with one of those conductors the equipment grounding conductor, and one the grounded (neutral) conducotr. This is verified by the set just above the damaged set.
Even if this panel had identified the terminals as being ok for more than one conducotr, the more than one conductor would still have to be only equipment grounding conductors, never the grounded.
Now the problem. Due to the loose screw, there was arcing due to the load, then overheating of that conductor, then insulation failure.
Solution? Shoot the guy who did it? Na, he just didn't know (how many of us did this in the past, before getting an education here on this forum, or other ways!!!). Cut back the neutral to a point where the insulation is not damaged, splice a new piece in, and terminate it correctly.
Re: The death of a very loose grounded conductor!#104648 09/18/0308:20 PM09/18/0308:20 PM