检查电路时，确保零线没有松动。

When checking the circuit, ensure the null line is not loose.

如果零线断了，电器可能会损坏。

If the null line is broken, the appliances might get damaged.

电工在安装插座时必须连接零线。

The electrician must connect the null line when installing the socket.

在三相电路中，零线是必不可少的。

In a three-phase circuit, the null line is essential.

零线在电路中起到平衡电压的作用。

The null line helps balance the voltage in the circuit.

这一根是零线而不是火线.

This is a earth line rather than a live line.

所以在安装时一定要求接入零线。

Therefore, the earth wire must be connected to it when electric meter is set up.

暗式配电箱箱盖紧贴墙面；零线经汇流排（零线端子）连接，无绞接现象；

Dark electricity supply box tops should cling to wall surface, no wring in the accordant junction with neutral wires;

严禁将地线接在零线或自来水管上。

Strictly prohibited ground connected to the zero line or water pipe .

零线电流，指的是通过并联系统零线的电流，在谈及环流电流或者交叉电流时常会提到这个术语。

Neutral current is the current that flows in the neutral leg of a paralleling system. Often, this term is used in reference to circulating currents or cross currents.