Might be adding too much complexity, but what about different sizes/gauge of wire for different voltages. Use a small gauge wire for HV and your wires burn. HV wire for low voltage still works though.
Copper would have to be craftable into a refined block first, then one block with six rubber for insulator as usual.
First:
c c c
c c c = C
c c c
c=copper ingot, C=Copper block
Then:
R _ R
R C R = HV wire
R _ R
R= Rubber, C= Copper block
Armored wire; similar to what is used for high tension lines and oil exploration IRL. Once a wire block is placed it takes an axe to remove it and gains a lot of damage resistance to explosions.
i W i
i W i = 3 Armor wire
i W i
i= iron ingot, W= any wire
