I am in the process of having a new garage built, I want to bring the electric under ground from my house, I have two two hundred amp services in my home. what is the best way to bring the service up through the foundation before it is poured?
I personally wouldnt bring the actual service in until the foundation was set and the building was under roof. But you could bring a conduit in, with pull ropes inside. Just trench it in, put the conduit down, backfill then let the foundation contractor worry about it. You may want to put a double 90 on top of the conduit to keep the rain out. I wouldn't use a cap because the rope would fall in, and it would be hard to retreive.
If you are concerned just about the garage end right now then you can just trench near the garage and stub up a PVC conduit into the wall where the electrical panel will go.
Later you can finish the trench and run to the house. Of course you can also run a complete conduit from the house to the garage if you want. In fact I would recommend it.
Make sure you secure the conduit in it's place. Concrete guys are not the most gentle when it comes to pouring. Finishing is another story, there they can be almost like surgeons.
Sometimes I feel like if I answer any more questions it is like someone trying to climb over a fence to jump off a bridge and me giving them a boost.
Answers based on the 2011 NEC.