Data Cable

Data Cables are types of wire that do, in fact, carry voltage. They just use that voltage to inform machines connected to it about changes and whatnot. Every machine, except for the energy storage devices and energy creating devices, have their own different current for data. Machines are only capable of accepting data from cables sending the same amount of EU as their type of data. This allows syncing of machines. You can sync overclocking and transformer upgrades, but not energy storage upgrades.