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The Principle Of Cable Selection

- Sep 21, 2017 -

1. Choose the type of wire and cable

When using wires and cables, consider the use, laying conditions and safety; for example:

According to the different uses, power cables, overhead insulated cables and control cables can be used;

According to the different laying conditions, the general plastic insulated cable, rubber insulated cable, steel tape armored cable, steel wire armored cable and anticorrosive cable can be used;

According to the safety requirements, flame retardant cable, halogen free flame retardant cable and fire-resistant cable can be used.

The selection of wire and cable specifications

When determining the specifications for the use of wires and cables (conductor cross section), heat, voltage loss, economic current density, mechanical strength and other conditions should be taken into account.

According to the experience of low-voltage power line due to the load current is large, so generally according to the heat conditions section, and then check the voltage loss and mechanical strength; low voltage lighting line because of its high requirements of voltage level, can according to the allowable voltage loss section, then checking the heating condition and the mechanical strength of high voltage circuit; first according to economic current density section, and then check the heating conditions and the allowable voltage loss; and the high voltage transmission line, its mechanical strength is also fulfilled. If the user does not have experience, you should consult the relevant professional units or people.