Hoping someone can add some clarity. How is each wire size determined when smaller wires are connected to a larger wire and the wires are different lengths? E.g. A Landing light in each wingtip draws 7.5 amps. Wiring from each light is 12' long and terminates in the center of the fuselage, where they connect with a single 5' wire going to the switch. Total current draw is 15 amps. The single wire from the junction to the switch is obviously carrying twice the load. A single point ground will of course mean the ground wires will be of nearly identical length as their power counterparts. I can see a couple ways of doing this. Curious to know how others have done it.