1. Do I need to follow the star wiring method as indicated in the dcs Manuel or can I use a buss wire ?
The best wiring choice for DCS is absolutely star or home run wiring. However, some have had great success with buss wiring while some others have not. The choice is yours.
2. How often do you need to or recommend putting track feeders?
You should adhere to the rules as described in The DCS Companion 3rd Edition and use center rail-insulated track blocks of the designated length, with only one wire connection per block. Anything else will open you up to possible DCS signal strength problems, or maybe not. Again, the choice is yours.
3. Wire size for buss or star pattern and should it be solid or stranded?
Absolutely stranded and not solid. Wire gauge is dependent on the length of the wire runs.
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