There are several ways to tell whether a wire core is copper or aluminum

First of all, from the model of the wire, the meaning of the letters in the model is as follows: B - fixed laying; X - rubber insulation; L - aluminum core (copper core without letters); W - neoprene sheath; Y -- Polyethylene sheath. Such as: BXW -- copper rubber insulated neoprene sheath wire; BLXW -- Aluminum core rubber insulated neoprene sheathed wire.

Secondly, it is intuitive to distinguish from the wire core material. The wire core of copper core wire is copper, and the wire core of aluminum core wire is aluminum. Because copper is golden yellow and aluminum is white. You can peel off a small piece of wire directly and check the color to distinguish whether it is copper or aluminum.

Warm tip: now many aluminum core wire will be on the core surface of a layer of yellow material, commonly known as copper clad aluminum wire, looks yellow. There are different methods: one is to scrape the surface, copper core wire or yellow, aluminum core wire is white; Two is to burn with a lighter, the flame of copper core line is blue, the flame of aluminum core line is white. So we must polish their shining eyes, do not be unscrupulous business blinded.

The difference between aluminum wire and copper wire

1, copper wire and aluminum wire interception is different;

2. Aluminum wire is relatively cheap;

3, aluminum wire is lighter;

4, the mechanical strength of aluminum wire is poor;

5. Aluminum wire is easy to oxidize at the end of the connection line, and the temperature will rise after the oxidation of the connection line end

6, copper wire internal resistance is small. Aluminum wire has greater internal resistance than copper wire, but it dissipates heat faster than copper wire. It is mainly different current-carrying capacity and mechanical strength. The resistivity of copper is 0.017 and that of aluminum is 0.029. So the current-carrying capacity of aluminum is about 80% of that of copper. Mechanical strength copper is much better.

The advantages and disadvantages of copper wire (cable) and aluminum wire (cable) are compared

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

2, copper core ductility is good;

3, high strength of copper core: allowable stress at room temperature, copper can reach 20, aluminum is 15.6 KGT /mm2;

4, copper core fatigue resistance: aluminum repeatedly bending easy to fracture, copper is not easy;

5, copper core stability, corrosion resistance: copper core oxidation resistance, corrosion resistance, and aluminum core is vulnerable to oxidation and corrosion.

Although the aluminum core is cheaper, but in addition to cheap, in many cases, the rest is a chicken feathers, especially for some products, should be more cautious.