Power to track

I have a Digitrax Zephyr I am making a loop within a loop and will have 4 turnouts

Does the outside track and inside track need power from the Zephyr or just the outside track

You might want to post your question on either the Model Railroader or Classic Toy Trains Forums, I imagine you’ll get better answers there. This one is about the real trains, 1 to 1 scale.