Three phase motors are more efficient than single phase motors and are commonly found in applications requiring more than 75 horsepower although the national electric code does not specify specific conductor colors for three phase current it is common to use black red and blue wires to identify lines l1 l2 and l3 respectively. Starting stopping of 3 phase motor from more than one place power control diagrams control 3 phase motor from more than two buttons power control diagrams on off three phase motor connection power control schematic and wiring diagrams three phase motor connection reverse and forward power and control wiring diagrams. Three phase wiring diagrams always use wiring diagram supplied on motor nameplate colored leads are only applicable on the new rolled steel motor lines . A three phase motor is more efficient than a single phase motor because of the peculiarities of alternating current ac wire a three phase motor in either a wye configuration or a delta configuration in high or low voltage using a nine lead set up. Three phase electric power is a common method of alternating current electric power generation transmission and distribution it is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power it is also used to power large motors and other heavy loads a three wire three phase circuit is usually more economical than an equivalent two wire
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