If the main zero line is broken, it may burn electrical appliances, we know that the voltage before the three firewire 380V we call the line voltage, any one of the firewire and the zero line between the voltage is 220V we call the phase voltage. We usually use electricity at home is the phase voltage 220V, but in the power supply bureau when the main line is a three-phase four-wire system

An analogy, now there are three houses need electricity, in order to balance the three-phase current, the three firewire will be given to the three houses respectively, A-phase to the house, B-phase to the house, C-phase to the house, three firewire a family of one, while the zero line is only one of the three communal.

Once the main zero line is disconnected, the three wires will be connected to each other through their respective electrical equipment, connected in series into a circuit with a voltage of 380V, due to the power of the respective electrical equipment is not the same, so it is easy to lead to small power equipment burned out, while the power of the equipment can not be rated for normal operation.

Expanded information:

Zero wire charged

Causes and solutions to the charge

Causes and solutions to the charge

Cause and solution /p>

1, the zero line charged is not a reflection of good grounding, if a good grounding, the current will flow into the ground, the electric pen will not be detected. If the electric pen detects a charged zero line, either the zero line is broken or the contact is bad. But this is actually the result, not the cause of the zero wire charged;

2, cause: under normal circumstances, there should not be electricity on the zero wire. Therefore, once there is electricity, is certainly a manifestation of the fault; the simplest is electromagnetic induction, and this time the zero line is not well grounded, failed to form a circuit

Secondly, the leakage of electrical equipment or phase line touching the shell, but the current is not large, so it has not tripped; the zero line is electrically charged, the zero line is certainly not well grounded; solve the problem, and then look for the cause of the equipment.

Baidu Encyclopedia - Zero Line