江苏春晨电缆有限公司生产YFFB扁电缆三相交流电，单相交流电主要有单相两线式、単相三线式供电方式。家庭用电一般都是单相交流电，单相与三相交流电照明配电线路图解
Diagramming of single phase and three phase alternating current lighting distribution lines
单相交流电主要有单相两线式、単相三线式供电方式。家庭用电一般都是单相交流电。
The main power supply single-phase AC single-phase two wire, single phase three wire. Household electricity is usually a single phase alternating current.
1）单相两线式
1) single phase two line type
单相两线式照明配电线路如下图。
Single phase two line lighting distribution lines are illustrated as follows.

The two lines from the three-phase three line high voltage transmission line are sent to the high voltage transformer, and the voltage after voltage change (as from high voltage 6600V to 220V) provides 220V voltage to the home lighting line, the primary and secondary isolation of the transformer, and the voltage between the output fire line and the zero line is 220V.

Diagramming of single phase and three phase alternating current lighting distribution lines
2）单相三线式
2) single phase three line type
単相三线式配电线路图如下。YFFB扁电缆三相交流电
Single phase three wire distribution circuit diagram as follows.
単相三线式供电中的一条线路作为地线与大地相连。此时，火线与地线之间的电压为220V，零线N（中性线）与火线（L）之间电压为220V。由于不同接地点存在一定的电位差，因而零线与地线之间可能有一定电压。
Single phase three line power supply line as the ground wire is connected to the earth. At this time, the voltage between the fire line and the ground wire is 220V, and the voltage between the zero line N (neutral line) and the fire line (L) is 220V. Because there is a potential difference between different grounding points, there may be a voltage between the zero line and the ground wire.