Questions,questions questions.For any and all gurus.If I have to put a plug on a dryer then why do I have to hard wire my dishwasher,oven and p.o.u water heaters?Or do I?Id prefer installing recepts and plugs for easy access and removal.Receptacles are more eye pleasing rather than a hole in the wall with a wire dangling out.
Much of it depends on what is considered a "fastened in place appliance." Water heaters, double ovens, dishwashers, garbage disposals are considered fastened in place, and are hard wired. Appliances such as ranges, dryers, etc are movable and are nice to be able to unplug and move. (Ranges and dryers can be hardwired) FIP appliances really don't need plugs because the flexablity is really not needed. Many times, a disconnect is needed for such.
You could if you wanted to. There's no code restriction as long as the equipment (cord and plug etc.) are approved and rated for the purpose. Most direct wires in a house are done for reasons of speed and material costs. Every connection you make is a potential trouble spot. The fewer the better.