My idea tackles the annoying situation where you need to run a cable past a machine because of space constraints, but just can not do it because doing so means the machine will interface with the wire.
Craft one by putting a painter with a yellow dye and black dye, then apply it to a wire you want to isolate. The isolated wire will connect to any other coloured wire (Or uncoloured wire) but will stay unconnected from all machines.
Visually the cable will look like it has electrical tape around it, so yellow and black stripes.
A small addition, but one I would find very handy in IndustrialCraft, what do you think?