three-phase electric power
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Three-phase electric power is a common method of generating, transmitting, and distributing alternating electrical current. It matters because it provides an efficient way to deliver electricity across power systems that serve homes, businesses, and industries.
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Three-phase transformer with four-wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases
Three-phase electric power (abbreviated 3ϕ) is the most widely used form of alternating current (AC) for electricity generation, transmission, and distribution. It is a type of polyphase system that uses three wires (or four, if a neutral return is included; not counting any protective conductor) and is the standard method by which electrical grids deliver power around the world.