Hello, I am in the process of constructing a modest 15 x 18 layout powered by 2 ZW transformers. Would 14 gauge wire be adequate for the power feeds as well as to supply accessories and for the commons?
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Yes
You might want to consider one power supply just for the track, and a separate one for turnout controls and lighted accessories etc. Because if those are all on one transformer building or street lighting will flicker when turnout controls activate...etc.
#14 will work for most railpower applications. For short wire runs such as drops connecting the track to a Bus run, #16 or even #18 serves well. However, for accessories #22 is adequate including to activate switch motors.
If one has a long reaching wire run and plans to run heavier railpower loads, i.e; two long incandescent-lighted passenger trains pulled by mu-ed twin motor engines operating in the same power district, perhaps #12 would be more appropriate. It is common to read of Forumites using 12 gauge Bus wire runs for railpower.
As noted above, separate power sources for separate applications is appropriate.
