Characteristics of power cables and how to choose power cables
Release time：
2022-05-24
Origin：
Author：
Power cables and wires and cables play an important role in people's life and production. Do you know what to pay attention to when purchasing power wires and cables? When selecting wires and cables, generally pay attention to the selection of wire and cable models and specifications (conductor cross-section).
⒈ Selection of wire and cable models When selecting
wires and cables, use, laying conditions and safety should be considered; for example,
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, anti-corrosion cables, etc.;
according to safety requirements, non-flammable cables, flame-retardant cables, halogen-free flame-retardant cables, fire-resistant cables, etc. can be selected.
⒉ Selection
of wire and cable specifications When determining the use specifications (conductor cross-section) of wires and cables, 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 the section is generally selected according to the heating conditions, and then the voltage loss and mechanical strength are checked; the low-voltage lighting line has high requirements on the voltage level. Select the cross section, and then check the heating conditions and mechanical strength; for high-voltage lines, first select the cross-section according to the economic current density, and then check the heating conditions and allowable voltage loss; for high-voltage overhead lines, the mechanical strength should also be checked. If the user is inexperienced, he should consult the opinions of relevant professional units or persons. Refer to the following table for the selection of general wire and cable specifications: Reference table for selection of wire and cable specifications
Conductor cross-section mm 2
Copper core PVC insulated cable ambient temperature 25 ℃
Overhead laying 227 IEC 01 (BV) Copper core PVC insulated power cable
ambient temperature 25 ℃
direct buried laying VV22-0.6/1 (3+1)
steel core aluminum stranded wire ambient temperature 30 ℃ overhead laying
Power,generally , selection
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