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Why aluminum core wires are more easy to catch fire

In power cords, copper conductor power cords often use conductor materials because of their low resistance and are suitable for major projects. At the same time, aluminum conductors are used relatively more frequently in engineering wiring, but they are only suitable for general projects. . The resistance of aluminum core wire is greater than that of copper core wire. When power is applied, if the power cord is overheated, aluminum, which has a lower melting point than copper conductors, is more likely to melt, and it is easy to short-circuit the wire and cause a fire.

If the aluminum core wire is exposed to the air, the surface will be oxidized in a few seconds. Therefore, when the aluminum wire is connected, it should be coated with conductive paste immediately after scratching the surface of the aluminum wire to separate the surface of the aluminum wire from the air. Contact, otherwise it will increase the contact resistance. In a humid environment, the situation is particularly obvious. The surface of the aluminum core wire will be plated with an oxygen-free copper layer, and the copper-aluminum metal material will constitute the reaction of the galvanic battery, leading to accelerated oxidation. corrosion. Since aluminum has worse electrical conductivity than copper and has a higher resistance, the loss of current in the circuit is large, which is very easy to cause waste of electricity.

How to distinguish between copper and aluminum conductors: Look at the cross section The internal conductor of the power cord is composed of many small filaments and multiple strands. Cut the cross section. The whitish color is the aluminum wire, or the brass color is the copper wire.

The commonly used aluminum core wire is BLV, that is, plastic aluminum wire, the general color is red, yellow, blue, green and black. The specifications are generally 2.5 4 6 10 16 25 35 50 70 95 120 150 185 240 300 square, of which the most commonly used are BLV2.5 square and 4 square.

The advantages of aluminum core wires will be introduced below for your reference.

1.Using cost advantageDue to the difference in the price of copper and aluminum, aluminum wire has a great advantage over copper wire in use cost, and at the same time, it will occupy much lower capital than copper wire.

2.Light weightThe density of aluminum is only 1/3 of that of copper, so aluminum wire products are also heavier than copper wire.

3.The thermal performance of the product is better than that of copper wire.
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