When does one run tie lines and how?

I saw the picture details of a small studio you built and saw the green PVC pipes under the concrete. My question is: At what stage did you actually run the wires and cables through those pipes? Was it before concrete was poured? If it was after, how did you pull those wires through the pipes? My live room is 25X40 Thanks, Chad

Running cable and wire through conduit after it is installed is done by using a fish tape. Or you can run a fish line inside the conduit while you are installing it. As long as you don't have more than 2 90 degree turns in the run it's fairly easy to push the fish tape through and tape the cable and wire to it then pull it through when you are ready to do your wiring.