I have a 12 x 28 conventional layout. I have 4 loops, lots of accessories and lights. I ran a #8 common wire bus under the entire layout and use it for everything. The other wire bus for the loops and accessories is #14. A separate bus for each loop and separate buses for 12V, 14V and 16V accessories. Half way around the layout each bus is connected to an on/off toggle switch so that I can isolate half the layout when trouble shooting.
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