1. Three-phase power has 3 distinct wave cycles that overlap. Each phase reaches its peak 120 degrees apart from the others so the level of power supplied remains consistent. Common it will used in large businesses, as well as industry and manufacturing.
2. Three-phase electric power is a common method of electric power transmission. A three-phase system uses less conductor material to transmit electric power than equivalent single-phase, two-phase, or direct-current systems at the same voltage. In a three-phase system, three circuit conductors carry three alternating currents (of the same frequency) which reach their instantaneous peak values at different times. Taking one conductor as the reference, the other two currents are delayed in time by one-third and two-thirds of one cycle of the electrical current.
https://www.tripplite.com/products/single-vs3-phase (1.); https://www.cableorganizer.com/articles/three-phase-electric-power.html (2.)
Author: Laura Saupe