Billy, The original poster asked what size wire to use with his Tortoise machines. The answer is a AWG to handle 15 ma. That is minimum size to run from each DPDT switch to each machine, period. (the correct answer BTW is 39 AWG). No one wants to work with wire that small but as some have stated above 28 AWG is more than enough.
How you wire from your power source to these DPDT switches is another question. If you have them all on a single buss then simply add up the current requirement. Maybe you have a large layout with multiple control panels with each panel controlling just few switches. Then its simply the total of each cluster.
No need to select a single wire size based on total number of switches.
BTW you can activate a switch then remove power and it will stay in position. Mine are only powered to move them. I have replaced the supplied .025" music wire with .040". The points stay in placed even unpowered.
Pete
