For example: Unqualified cable laying and installation construction can easily cause mechanical damage, and underground cables in civil construction are also prone to cable damage. Sometimes if the damage is not serious, it may take several months or even years for the damaged part to completely break down, and sometimes it may cause serious damage to the electrical unit that may cause a short circuit failure, directly affecting the safety of production.

For example: cable joints are not made up of qualified materials and are placed in humid climates. The joints can allow water or water vapor to mix with the water tree in the formation for a long time under the action of the electric field, gradually damaging the insulation strength and causing cable failure.

In the area of ​​acid-base interaction, due to long-term chemical or electrochemical corrosion caused by armored cables, conductors, or corrosion protection layers, the outer protective layer is often caused, resulting in poor insulation of the protective layer and also causing cable failure.

Overload operation, due to the thermal effect of the load current passing through the cable will inevitably to heating of the conductor. At the same time, the skin effect eddy current loss of charge, and dielectric loss of steel armor can also generate additional heat, thereby increasing the cable temperature.

The cable joint is the weakest link of the cable personnel, which is often the cause of cable joint failures. In the process of making cable joints, if the crimping is not tight and the heating is not sufficient, the insulation of the cable head will be reduced, causing accidents.