Saturday morning I got up to find that charging was interrupted overnight. I went to the garage and was hit with that burning electrical odor - very strongly. I unplugged the charger from the wall (it took a bit of doing), and saw that one of the side-by-side prongs had plastic from the receptacle all over it. I didn't plug in last night. Today I removed the receptacle from the wall and found that the unit was partially melted! It had gotten so hot that the upper screw holding the receptacle in the box even discolored. That explained why the top screw was partially out of the wall, too - it had melted the plastic threads in the box and pulled out. Here's what it looked like when I pulled the receptacle: Obviously the black conductor got extremely hot at the plug. You can see that it was stuffed into a standard single outlet / switch box, and there was absolutely no slack in the wires. I had to pull like a son-of-a-hmmm to get the outlet out, and it pulled the wires off the terminals in the process. Not exactly a per-code installation, I think. The installation was done by the property manager's electrician. Now I'm stuck on 120V-15A for the next few weeks until I move. I'll be having a new NEMA 14-50 installed at the new place - by a different electrician!