I hope this makes sense.. say i have a circuit with 3 lights (5amps each for a total of 15amps) on it all in a line from the fuse. 1st one is 5 feet from the fuse, 2nd is 10' and the last is 15'. Can i start with 10awg (The calculator i used said 10awg is correct for 15' at 15amp) that runs towards all 3 lights. Once that 10awg reaches the 1st light can I continue after the first light with a lower awg wire since after the 1st light the rest of the run would only be 10amps now for the next 2 lights? And then possibly smaller awg after the 2nd light because the rest of the run to the last light is only 5amps? Almost like plumbing where you can reduce the size of the water line after feeding some fixtures as long as the continued run is sized properly for the remaining fixtures. Any and all help is greatly appreciated.