Before revision: 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 a common type of alternating current (AC) used in electricity generation, transmission, and distribution.William D. Stevenson, Jr.
After revision: 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 a common type of alternating current (AC) used in electricity generation, transmission, and distribution.William D. Stevenson, Jr.