Making or buying a really long Power Functions cable I'm working on a train layout and have built 2 automatic switches for the switch track. Each switch track is powered by M-Motor. I'd like to connect the 2 motors to a single IR receiver and battery pack with 6 AAAs. Unfortunately the longest extension cable I can find is 20 inches. I need a much longer cable than that; more like 8 feet. Is there a limitation to the length? Is it possible to make or buy such a cable? I'd like to avoid adding more Power Functions equipment if possible.
As the PF plugs are specific, the simplest thing to do is to buy a short extension cable, cut it in half and solder another cable in the middle. Current in PF cable can be pretty high, so to avoid too much drop it's best to avoid thin cable, I recommend 0.5mm² of copper section.