The characteristics of power cables and how to choose power cables? Power cables and wires play an important role in people's daily life and production. Do you know what to pay attention to when choosing power cables and wires? When selecting wires and cables, it is generally important to pay attention to the selection of wire and cable models and specifications (conductor cross-section).
1. Selection of wire and cable models
When selecting wires and cables, consideration should be given to their 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 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 specifications
When determining the usage 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.
Based on experience, low-voltage power lines generally choose their cross-section according to heating conditions due to their high load current, and then verify their voltage loss and mechanical strength; Low voltage lighting lines, due to their high requirements for voltage levels, can first select the cross-section according to the allowable voltage loss conditions, and then verify the heating conditions and mechanical strength; For high-voltage lines, first select the cross-section according to the economic current density, and then verify its heating conditions and allowable voltage loss; And for high-voltage overhead lines, their mechanical strength should also be verified. If the user has no experience, they should seek opinions from relevant professional units or individuals. The selection of general wire and cable specifications can be found in the following table:
Reference Table for Selection of Wire and Cable Specifications
Conductor cross-section mm 2
Copper core PVC insulated cable ambient temperature 25 ℃
Overhead laying of 227 IEC 01 (BV) copper core polyvinyl chloride insulated power cables
Environmental temperature 25 ℃
Direct buried laying VV22-0.6/1 (3+1)
Steel core aluminum stranded wire overhead laying at an ambient temperature of 30 ℃
