discoloring Insulation in panel

[Bsquared]

Thanks Kal, after disassembling my panel, a could tell it was "a)" that was the problem at the inlet. I could see where the un even cut of the wires was causing an arc and damaging the connection. So I'm making sure I have square cuts and the proper length strip with this build. I'll look in to a torquing screw driver too.