Two speeds one direction three phase motor connection power and control diagrams two speeds two directions multispeed 3 phase motor power control diagrams multi speed 3 phase motor 3 speeds 1 direction power control diagrams one line diagram of simple contactor circuit three phase electrical wiring installation in home . Nidec motor corporation trademarks followed by the r symbol are registered with the us patent and trademark office all non nidec motor corporation marks shown within this website are properties of their respective owners. Three phase wiring diagrams always use wiring diagram supplied on motor nameplate colored leads are only applicable on the new rolled steel motor lines single phase wiring diagrams always use wiring diagram supplied on motor nameplate for motors with thermal protection single voltage single rotation single voltage reversible rotation dual voltage single rotation split phase motor . Three phase systems are extremely common in industrial and commercial settings they can also be found in large residential complexes and appliances requiring a large amount of power although these systems may seem intimidating at first a walkthrough on 3 phase wiring for dummies will help clarify the whole situation different regions may use different voltages. Three phase electrical wiring installation in home iec nec single phase electrical wiring installation in a multi story building three phase electrical wiring installation in a multi storey building the star delta y 3 phase motor starting method by automatic star delta starter with timer