First, the selection of wire and cable model specifications:
1, wire and cable model choice selection of wire and cable, consider the use, laying conditions and safety; for example, according to different purposes, the choice of power cables, overhead insulated cables, control cables; depending on the laying conditions, the choice of Usually plastic insulated cables, steel armored cable, steel wire armored cable, cable and other anti-corrosion; according to security requirements, the choice retardant cables, fire-retardant cables, flame retardant cable, fire-resistant cables.
2, wire and cable size selection determines use of wire and cable specifications (conductor cross-section), the general should consider the heat, voltage loss, economic current density, mechanical strength and other selection criteria. According to experience, low-voltage power lines because of the load current is large, it is generally to press the heating conditions are selected cross-section, and then checking the voltage loss and mechanical strength; low-voltage lighting line because of its high voltage level requirements, press the allowable voltage loss condition Select profile, then checking the heating conditions and mechanical strength; high-voltage line, then press to select economic current density cross-section, and then checking the heating conditions and allow its voltage loss; and high-voltage overhead lines, also checking its mechanical strength. If the user does not have experience, you should consult the relevant professional wire manufacturer or person.