What causes the zero wire to burn?

Burning the zero line is a phenomenon we often encounter, which causes great losses and inconvenience to our work and life. So what exactly causes the phenomenon of zero line burning?

1. Overload: When the load in the circuit exceeds the rated current that the neutral line can withstand, it will cause the neutral line to overheat and burn out. Overloading can be caused by the electrical equipment connected to the circuit having too much power, or by using multiple high-power equipment at the same time.
2. Short Circuit: A short circuit is a direct, low-resistance connection between the positive and negative terminals in a circuit, causing a sudden increase in current. When a short circuit occurs, a large amount of current will flow through the neutral wire, causing the neutral wire to overheat and burn out. Short circuits can be caused by damaged wire insulation, internal faults in electrical equipment, or faulty connections between wires.
3. Design or installation issues: If the size of the wire does not meet the load requirements, or the wire connection is not secure, it may also cause the neutral wire to overheat and burn out.
4. Aging or damage of the neutral wire: After long-term use, the insulation material of the neutral wire may be aged or damaged, resulting in excessive current and overheating of the neutral wire.
5. External factors: In some cases, external factors such as lightning strikes, animals chewing wires, damaged wires, etc. may also cause the neutral line to burn out.