AC phase classification
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AC phase classification
Three-phase power
Main article: Three-phase AC
Three-phase alternating current, there are only three live lines when transmitting power, and there are three live and neutral lines when supplying power to customers. Only one of the phase and neutral lines is used, which is single-phase electricity.
The sine waves on the three lines of fire each have a phase difference of 120°, mainly for industrial use.
If the phase voltage is 220V, the line voltage is 380V.
The three-phase power is generally three-phase four-wire. The symbols of the three phase lines are L1, L2, and L3, which can also be represented as A, B, and C, respectively, representing phase line 1, phase line 2, and phase line 3, where L is the abbreviation of Live Wire, and the symbol of the zero line is N, an abbreviation for Neutral Wire. The ground line is E, which is the abbreviation of Earth.
Single phase electricity
Main article: Single-phase AC
Single-phase AC, the cable has a live line and a center line for general residential and commercial buildings.
Single-phase electric has two lines of live and neutral, the fire line is L, which is the abbreviation of Live Wire, and the zero line is N, which is the abbreviation of Neutral Wire. The ground line is E, which is the abbreviation of Earth. It can also be written as PE, which is the abbreviation of Protecting Earth.