nuclear power plants. As far as the classification is concerned, it does not belong to the same classification method as the categories of power, control, computer cable, etc., that is, the special cables are included in the cables listed above. In general, special cables need to formulate internal control standards for enterprises.

Special cables are a series of products with unique properties and special structures. Compared with ordinary wires and cables with large quantities and wide areas, they have higher technical content, stricter use conditions, smaller batches and higher added value. Features. New materials, new structures, new processes and new design calculations are often used.

1. Selection of special wire and cable models

When selecting wire and cable, consider the use, laying conditions and safety.

According to different uses: power cables, overhead insulated cables, control cables, etc. can be used;

According to different laying conditions: general plastic insulated cables, steel tape armored cables, steel wire armored cables, anti-corrosion cables, etc. can be selected;

According to safety requirements: flame retardant cables, halogen-free flame retardant cables, fire-resistant cables, etc. can be used.

2. Selection of special wire and cable specifications

When determining the specification of wire and cable (conductor cross-section), consideration should be given to heat generation, voltage loss, economic current density, machinery

Strength and other conditions.

Because the load current of the low-voltage power line is large, the cross section is generally selected according to the heating conditions, and then the voltage loss and mechanical strength are checked;

Because of its high voltage level requirements, the low-voltage lighting line can first select the cross-section according to the allowable voltage loss condition, and then check the heating conditions and mechanical strength;

High-voltage line, first select the cross-section according to economic current density, and then check its heating conditions and allowable voltage loss;

The mechanical strength of high-voltage overhead lines should also be checked.

If the user has no experience, you should consult the relevant professional unit or person.