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It makes no difference whether you're wiring for DC or DCC - the wiring is the same. You can use a DPDT switch as shown in the Peco instructions in diagram 10 here - http://www.peco-uk.com/imageselector/Files...%20Turnouts.pdf

Alternatively you can use a twin switch on the connecting point, which must have been modified to fully isolate the frog electrically. I use Tortoise slow-action point motors which have two built-in SPDT switches. The first is used for two of the frogs - the point's own frog and that of the crossing furthest away (as they both always need the same polarity), with the other crossing frog switched by the second switch. The only proviso is that when a train takes the straight route through the crossing, the turnout must not be set to route over the crossing, else you'll get a DCC short. But this is standard prototype operation anyway.
 
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