Just a note for those contemplating building or revamping a shop. When I built mine I put all the wall outlets at 52" high, This makes them much more handy for plugging in and it means you can lay a four foot wide sheet against a wall and not block the outlets.
Oh yes, and you can never have enough outlets. Mine are placed every four feet along the walls and the two outlets are split so that each is on a separate breaker. There are several plug ins on each breaker, just not two from the same outlet box.
Pete