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# Three-phase electricity to two-phase electricity connection

In the daily work of an electrician, sometimes it is necessary to convert three-phase electricity into two-phase electricity for use to meet the needs of production, so what is the method of converting three-phase electricity into two-phase electricity, and how to connect three-phase electricity to two-phase electricity , let’s find out together.

Three-phase alternating current is a form of transmission of electrical energy, referred to as three-phase power. Three-phase AC power supply is a power supply composed of three AC potentials with the same frequency, equal amplitude, and 120° phase difference.

There are many uses of three-phase alternating current. Most of the AC power equipment in the industry, such as motors, use three-phase alternating current, which is the often mentioned three-phase four-wire system. In daily life, single-phase power is mostly used, also known as lighting power.

When lighting electricity is used for power supply, one of the three-phase electricity is used to supply power to electrical equipment, such as household appliances, and the other wire is the fourth wire among the three-phase and four-wire wires, which is the neutral wire. The neutral line is drawn from the neutral point of the three-phase electricity. (To learn power technology, please pay attention to the WeChat public account: Communication Power Man)

The connection method of three-phase electricity to two-phase electricity:

The color of three-phase electricity is yellow for phase A, green for phase B, and red for phase C. At present, there are several names: A, B, C or L1, L2, L3 or U, V, W, and the order is the same. of.

Evenly distribute the three-phase electricity to the upper ends of the six circuit breakers. The specific method is: the three-phase electricity under the air switch is 1, 2, and 3 from left to right; the upper end of the first two-phase open circuit is connected to 1 and 2 respectively;

The upper ends of the second two-phase circuit breaker are connected to 2 and 3 respectively; the upper terminals of the third two-phase circuit breaker are respectively connected to 3 and 1; then, the fourth circuit breaker is connected in the same way as the first circuit breaker; the fifth circuit breaker is connected to the second circuit breaker The connection method of the circuit breaker is the same; the connection method of the sixth circuit breaker and the third circuit breaker is the same. In this way, the three-phase distribution under the three-phase space is evenly distributed.

How to connect three-phase electricity to two-phase electricity?

When erecting wires, the “three-phase four-wire” standard wiring is used. In layman’s terms, it means: three live wires and one neutral wire; the voltage of the three live wires is 380 volts. This creates a voltage of 220 volts; most appliances in the home are connected this way.

First, it depends on whether the three-phase electricity is a four-wire system or a three-wire system. If it is a four-wire system, the three wires are live wires, and the remaining one should be thinner than the three wires, which is the neutral wire. If there are only three wires, then the neutral wire It is the ground under one’s feet, that is, a wire is directly drawn from the ground. The voltage between the three live wires of three-phase electricity is 380V, but there is only 220V between any live wire and the ground under your feet, which is the mains power.

Simple connection method of three-phase electricity to two-phase electricity (judging the correctness by yourself, and the consequences are at your own risk):

Green with blue, red with gray. The yellow and green wires are not connected for the time being. For safety reasons, wait until you buy a three-core wire and then reconnect it.