What electrical requirements does this dishwasher have, and does it need to be grounded?

The dishwasher is designed to operate on 120V, 60 Hz regular house current and must be connected to a circuit with a 15 ampere fuse or circuit breaker (20 ampere if connected with a food waste disposer). The dishwasher must be electrically grounded — the portable model uses a 3-prong grounding plug that must be plugged into a matching grounded receptacle. Never use an adapter plug, extension cord, or remove the grounding prong. (Pages 3, 12)