General principles for selection of wires and cabl

2022-07-22
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When selecting wires and cables, generally pay attention to the selection of wire and cable model and specification (conductor section)

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when selecting wires and cables, generally pay attention to the selection of wire and cable model and specification (conductor cross section)

key words: wire and cable selection

I. General principles for wire and cable selection

when selecting wires and cables, generally pay attention to the selection of wire and cable model and specification (conductor cross section)

1. Selection of wire and cable models

when selecting wires and cables, we should consider the purpose, laying conditions and safety; For example, according to different purposes, 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, anti-corrosion cables, etc. can be selected; According to the safety requirements, non flame retardant cables, flame-retardant cables, halogen-free flame-retardant cables, fire-resistant cables, etc. can be selected

2. Selection of wire and cable specification

when determining the use specification (conductor section) of wire and cable, generally, heating, voltage loss, economic current density, mechanical strength and other selection conditions should be considered. According to experience, because the load current of low-voltage power line is large, the section is generally selected according to the heating conditions, and then the voltage loss and mechanical strength are checked; Because of its high requirements for voltage level, low-voltage lighting lines can first select the section according to the allowable voltage loss conditions, and then check the heating conditions and mechanical strength; For high-voltage lines, the cross-section is first selected according to the economic current density, and then its heating conditions and allowable voltage loss are checked; The mechanical strength of high-voltage overhead lines should also be tested. If users have no experience, they should consult relevant professional units or persons

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