GMC Holding Corporation (fka GMCC)

[Id_Jit]

If, electrons have no tendecy to leave a wire or line...why enshroud it in plastic or rubber?

Ahh, BUT!.. The electrons in a wire *Under A Voltage Potential* DO have a tendency to leave the wire and return to their “Ground”.
*Technically* you are correct. There’s absolutely no technical need to enshroud those wires in plastic or rubber, because air will do the same insulation job. The proof in the pudding is a look at a high voltage transmission tower. Considering that the big insulators keep the lines’ voltage potential from contacting the metal of the tower, it’s only air that keeps current flow from between the wires.
I ain’t gonna go into the equivalent household wiring of this.
No Need To… Eh???

Id