PVC pipe is cheap compared to the labor to install it, even if you are doing it yourself. I would install a minimum of 3" schedule 40 PVC (Grey) for the electrical service, and a bunch of other 1 1/2" for other services that you might want in the future. I have found that it is better to have a separate tube for each of the other "services", such as telephone, cable, etc., since it is easier to pull just that one through the tube. I have found that if you try to add another wire at a later date to the tube, that sometimes they get tangled, and you wind up having to pull both out and start over again. If costs are a factor, you can use 1" for telephone, cable, etc., as long as the wire will fit through it without getting stuck in the pulling process. I would rather have 6 1" pipes than having 2 or 3 3" pipes for the ancillary services. I even pulled a 1" plastic water line through a 3" pipe. If it ever needs to be replaced, then I will just pull out the old and pull in the new. No digging up the yard. I put my well pipe in a 4" thin wall PVC pipe when I built the house, and I have learned that wasn't a good idea. The ground water gets into the thin wall pipe at the joints and follows the line into the basement. Good thing that I installed a French drain around the perimeter of the basement before the floor was poured. The water runs down the wall and into the drain.
I have also used a combination of plumbing and electrical PVC for non electrical or plumbing purposes, such as telephone. I used a tee with a clean out cap as a pull box in one line that has a few "twists" in it.
