Melted metal at outlet - Breaker never tripped
I wished I could take a picture to show. Today I found a circa 1960's outlet/wire behind my fridge scorched and I wonder if the damage is old or new.
There was about 1/4" of the wire, above the screw, where the insulation was burned. The 12g conductor was melted at that spot and was about half its diameter.
The portion was laying against the back of the outlet and melted a tiny spot on the back strap on the yolk.There was no burn or damage at the screw terminal although it didnt look like it was seated properly.
The fridge was working fine though and a breaker has never tripped that I know of.
I this was new damage and the wire was shorting out on the back of the outlet like that, why didnt the breaker trip?