Hey. play with this voltage drop calculator based on NEC standards. Take a 14' x 9' L-shaped layout with a buss from end to end. Assume 18VAC with an allowable voltage drop of 3% for 25 feet. Transformer at one and you want 6amps at the other end.
Here is the result:
1 conductors per phase utilizing a #12 Copper conductor will limit the voltage drop to 2.90% or less when supplying 6.0 amps for 25 feet on a 18 volt system.
Reducing the distance to 5' (a drop from the buss to the track, results in 14awg.
Then try reducing the voltage to 5VAC (which runs a conventional can motor engine at a reasonable speed) and the wire size gets very large to keep a 3% drop.
I don't see any of it effecting the TMCC signal until the engine isn't getting enough volts to operate. 14? perhaps.
