Cable Selection Principle

- Feb 13, 2019-

When selecting wire and cable, pay attention to the choice of wire and cable model and specification (conductor cross section).

1. Selection of wire and cable models

When using wire and cable, consider the application, laying conditions and safety; for example:

Depending on the application, power cables, overhead insulated cables, control cables, etc. may be used;

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

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

2. Selection of wire and cable specifications

When determining the specification (conductor cross section) of the wire and cable, general selection conditions such as heat generation, voltage loss, economic current density, and mechanical strength should be considered.

According to experience, the low-voltage power line has a large load current. Therefore, the cross-section is generally selected according to the heating condition, and then the voltage loss and mechanical strength are checked. The low-voltage lighting line can be subjected to the allowable voltage loss condition because of its high voltage level. Select the section, and then check the heating condition and mechanical strength; for the high-voltage line, first select the section according to the economic current density, and then check the heating condition and allowable voltage loss; and the high-voltage overhead line should also check the mechanical strength. If the user has no experience, they should consult the relevant professional unit or person.