Excellent description Artum! That explains a lot to me. Though technical, you put it in practical terms very well.
Yes, Cheese, I am saying the outer black insulation of the big shore power wire from the RV which used to fit snugly into the big molded 30A plug is not only not inserted into the plug, but comes short of meeting it and there is now a gap of 1/8 or 1/4 inch and I can see the inner colored wires.
I may have stretched it somehow to cause the separation?? But when this discussion (and I think one on the general forum) recently mentioned heat at the plug at the CG, I recalled a time or three where I thought it was unusually hot to the touch (I think it was at Henderson Beach SP in Destin).