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Some Basic Concepts on DCC Wiring - Turnouts
Under DC (or analog), the old rule was to power from the point end. By throwing the points, you'd route power into the siding (assuming you had a power-routed turnout).

However, along comes DCC and that all changes. You don't depend on the rails or turnouts to route your power - because you don't need to route your power. All rails can be powered all the time because the rails don't control the power that goes to the motor in your loco - the decoder in the loco does that.

However, we still see confusion about where we should place the power feeds to the track. Here's a little diagram of where to place the track feeds for a turnout.

Location isn't that important, as long as you have track feeds somewhere before the point of the turnout and track feeds on each of the diverging routes
Now, here's what most people forget.  The diverging rails are insulated from the frog and the point end of the turnout!!!.  The important part of the diagram above is the insulated gaps.  If you don't insulate the rails beyond the frog, you will have a short when you plug in your command station/booster. 

If you use a turnout like a Peco Insulfrog or an Atlas, you have an insulated frog so you shouldn't have to worry about cutting insulating gaps in the turnout. If you use a turnout like a Shinohara or you make your own, then you cut an insulating gap in the turnout just beyond the frog. 

On a lot of DCC discussion forums, you'll see a lot of talk about making a turnout "DCC friendly".  A lot of the discussion has to do with "power-routing" the frog.  You'll see instructions on how to almost comletely disassemble the turnout, trim the contact tabs under the throw-bar, cut insulating gaps on either side of the frog, connect a microswitch to the now-insulated gap, solder in a microswitch or two, add in some lightbulbs, and re-assemble the turnout. 

If you have to do all of this work, then perhaps you should consider buying another brand of turnout.  A lot of this is not necessary.  Much of this is overkill. 

The important thing to remember is that the diverging rails beyond the frog must be insulated.  This is done by cutting gaps in the diverging rails, or by means of an insulated frog. 

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