When purchasing wire and cable, we will find that the wire and cable products on the market are mainly copper core and aluminum core; In the purchase, some people will recommend aluminum core, because the price is cheaper than copper core in the same specification; It is also recommended to use copper core, which is considered safer and more cost-effective.

So when purchasing related wire and cable products, how should we choose? We understand the difference between the two and how to buy.

First, the difference between copper cable and aluminum cable

①, the carrying capacity of copper wire and aluminum wire is different;

2, aluminum wire is cheaper than copper wire;

③, aluminum wire quality is lighter than copper wire;

(4) The mechanical strength of aluminum wire is poor;

5, the aluminum wire is very easy to oxidize at the end of the connection line, and the temperature will rise after the oxidation of the connection line end;

The internal resistance of aluminum wire is larger than that of copper wire, but the heat dissipation is faster than that of copper wire. The main reason is the different current carrying capacity and mechanical strength. Copper resistivity 0.017, aluminum 0.029, so the current carrying capacity of aluminum is about 80% of copper.

Two, the advantages and disadvantages of copper cable and aluminum cable comparison

1. Low resistivity of copper cable: the resistivity of aluminum cable is about 1.68 times higher than that of copper cable;

2, copper cable ductility;

3, in terms of strength, the allowable stress of copper at room temperature can reach 20, aluminum is 15.6kgt/mm²;

4, copper cable fatigue strength is high, aluminum repeatedly bending easy to break;

5, the copper cable has good stability, corrosion resistance, oxidation resistance, corrosion resistance, and aluminum core is susceptible to oxidation and corrosion.

Third, the choice of wire and cable model

(1) When selecting wire and cable, consider the use, laying conditions and safety;

For example: according to the different uses, power cables, overhead insulated cables, control cables, etc.;

(2) According to the different laying conditions, general plastic insulated cables, steel tape armored cables, steel wire armored cables, anti-corrosion cables, etc.

(3) According to safety requirements, non-delayed burning cables, flame retardant cables, halogen-free flame retardant cables, fire resistant cables, etc.

Four, the choice of wire and cable specifications

1, to determine the use of wire and cable specifications (conductor section), generally should consider heating, voltage loss, economic current density, mechanical strength and other selection conditions;

2, according to experience, the low-voltage power line because of its large load current, so generally select the section according to the heating condition, and then check its voltage loss;

3, mechanical strength; Low voltage lighting line because of its high voltage level requirements, can first select the section according to the allowable voltage loss conditions, and then check the heating conditions and mechanical strength;

4, although aluminum cable is very cheap, but copper cable in the cable power supply, especially in the field of underground cable power supply, has outstanding advantages. Underground copper cable power supply has the characteristics of low accident rate, corrosion resistance, high reliability, convenient construction and maintenance.

Tianxing cable reminds everyone that when purchasing wire and cable, we must look for the regular manufacturer, check the quality, and do not buy some unqualified wires because the price is cheap.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.