1, wire and cable model selection When using wire and c […]
1, wire and cable model selection
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, steel tape armored cable, steel wire armored cable, anti-corrosion cable, etc. can be selected;
According to the fire rating and safety and environmental protection requirements, fire-resistant cables, flame-retardant cables, low-smoke halogen-free flame-retardant cables, and low-smoke halogen-free fire-resistant cables are available.
2, wire and cable specifications
When determining the wire and cable usage specifications (conductor cross section), 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 demander does not have experience in purchasing cables, they should consult the relevant professional units or personnel according to the project requirements.