The basic principle of wire and cable selection
In the selection of wire and cable, generally pay attention to wire and cable models, specifications (conductor section) choice.
1. Selection of wire and cable models
When using wire and cable, consider the use, laying conditions and safety. E.g,
According to the safety requirements, non-flammable cables, flame-retardant cables, halogen-free flame-retardant cables, fire-resistant cables, etc. may be selected.
2. Selection of wire and cable specifications
When determining the usage specifications (conductor cross-section) of wire and cable, heat, voltage loss, economical current density, mechanical strength, etc. 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 heat conditions, and then check its voltage loss and mechanical strength; low voltage lighting line can first press the allowable voltage loss condition because of its higher voltage level requirements. 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 its heating conditions and allowable voltage loss; and high-voltage overhead lines, but also check the mechanical strength. If the user has no experience, they should consult the relevant professional unit or person.