Recently I was inspecting a home built in the early 1990’s with 200 amp service. All of the outlets and lights in the house worked and the GFCI all functioned correctly. I was suprized when inspected the pannel because there were 2 neutral wires that had got so hot the insulation was charred. (see attached picture) I couldn’t find an obvious cause.
Among the possibilities:
1 The circuit overloaded and the breaker failed to pop
2 The was a short between a hot lead and these two wires
3 The wire were severely undersized for the breaker the were attached to.
If any of you can think of any other possibilities pease let me know,