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How to select the electrical cables and wires

2019-05-27

In the selection of wire and cable, generally pay attention to wire and cable models, specifications (conductor section) choice.

Keywords: wire and cable selection

First, the general 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; for example, depending on the application, choose the Power Cable, overhead insulated cable, Control Cable, etc.; depending on the laying conditions, use general plastic insulated cables, steel strips Armored cable, wire armored cable, anti-corrosion cable, etc.; according to safety requirements, non-flammable cable, flame retardant cable, halogen-free flame-retardant cable, fire-resistant cable, etc. can be used.

2. Selection of wire and cable specifications

When determining the usage specifications (conductor cross-section) of 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 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.

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