When selecting wires and cables, generally pay attention to the selection of wire and cable models and specifications (conductor cross-sections).

　　⒈Wire and cable model selection

　　When selecting wires and cables, consider the use, laying conditions and safety;

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

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

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

　　⒉The choice of wire and cable specifications

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

According to experience, the low-voltage power line has a large load current, so generally select the cross section first according to the heating condition, and then check its voltage loss and mechanical strength; low-voltage lighting line because of its higher voltage level requirements, you can first follow the allowable voltage loss conditions Select the section, and then check the heating conditions and mechanical strength; for high-voltage lines, first select the section according to the economic current density, and then check the heating conditions and allowable voltage loss; and for high-voltage overhead lines, check the mechanical strength. If the user has no experience, he should consult relevant professional units or persons.　　

　　Wire and cable installation construction　　

　　The design and construction of wire and cable laying and installation should be carried out in accordance with GB50217-94 "Code for Design of Electric Power Engineering Cables" and other relevant regulations, and necessary cable accessories (terminals and joints) should be used. The operation quality, safety and reliability of the power supply system are not only related to the quality of the wires and cables themselves, but also related to the construction quality of cable accessories and lines.