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Suggestions for Wiring Accessories

Hello Everyone:

I have another wiring question.  I run a separate transformer for all accessories.  Power runs to a terminal block then to the accessories, much like many of you run.  I use 18 guage wire to all my power drops from my track to its terminal block--it is a small layout (12X11).  The wires that are supplied with buildings such as MTH are small- 20 guage or higher.  What guage wire do you suggest I use from the buildings to the terminal block?  

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