The insulation will melt on some areas were the heat will come out. Remember that all appliances wire is insulated but they will fry too. Transformers wiring is well insulated but they will burn up. This is why they keep saying that only 197- on down will work. Some of the cables of the batteries will melt too. The EMP will travel though the wire and hit the electronics but some wires will burn up because the EMP electricity volt will be very high.