How do i wire toggle a switch in to control power to a siding.

I would definitely isolate the two loops with gaps between the x-overs. This will help out later down the road if you decide to add a second TPC. With the TPC you can run conventional engines or even MTH engines in conventional if you decide to. 

From an operational standpoint I would swap the the two x-overs putting the pair at the top of the diagram at the bottom and bottom set at the top. This will give you more operating freedom when doing switching on the inner loop.

If you use a complete loop, rather than two dead-ended half loops, the resistance of the loop will be cut in half at the point where the halves join.  The current can flow in both directions around the loop to get to the farthest point.

thanks for all the input guys heres where im at.  ok i did reverse the two crossovers. that was great idea.     I have a bunch of number 12 wire from my last job i assume this will be ok for the busses.  what size should i use for the feeders?

#16 is plenty for the feeders, and if they're short, #18 will do fine as well.

A few further questions?  how does evryone connect their feeders to thier busses?

 currennt plan is to isolate the inner and outer main. electrically but can they share a ground.

and regarding switches is the same bus and feeder method ok for  power switches.  and would a cw80 be to much or to nill for powering 14 fastrack switches?

Yes, the inner and outer mains can share a "layout common return" which is what I think you mean by "ground"[U post]. Definitely isolate your center rail hot at the connecting crossovers by cutting a gap in the center rail or placing a fiber pin in it.

thank you very much this is excellent information. thanks to everyone whos chimed inI'm in the process of wiring the buses and the feeders for the two mains right now will update soon.  again thank you all

FWIW o-60 and larger fastrack switches come with block sections attached, simply removing the  hot wire underneath allows for track isolation.

all origonal issues have benn resolved now for anew question.

what is the best way to wire in a toggle switch to control power to a siding and by control i mean turn on and off

Place gaps in the center rail the distance between as long as the section you want to isolate. Run power to one side of a toggle switch (minimum 10 amp contacts) and the other to the center rail.

For larger more complex layouts,relays simplify wiring and have their advantages. Described here

www.jcstudiosinc.com/BlogShowT...=635&categoryId=

Dale H