@KarlDL posted:If you use a shared common, it is wise to uprate the wire size. For example, if you're using #16 center rail feeders and three tracks, use #12 for the shared common distribution wire.
That's a great point. Yes, if one foresees the possibility of using multiple Hot circuits simultaneously, increasing the wire gauge for the shared common bus would be a good idea. The often overlooked common would be carrying the same amount of current as all three of the other wires combined.
For example, if a layout's three Hot buses were carrying 5 Amps each, the Common return would be carrying 15 Amps.
