First of all, from the wire model, 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 core rubber sleeve insulated neoprene sheath line; BLXW- aluminum core rubber insulated neoprene sheathed wire. Hainan electric network
Secondly, it is intuitively different from the core material. The core of copper core wire is copper, and the core of aluminum core wire is aluminum. Because copper is golden yellow and aluminum is white. You can directly peel off a short piece of wire core to see the color to distinguish whether it is copper core or aluminum core.
At present, the surface of many aluminum core wires is coated with a yellow substance, commonly known as copper-clad aluminum wires, which also looks yellow. The difference is: one is to scrape the surface, the copper core wire is still yellow, and the aluminum core wire appears white; The other is burning with a lighter, the flame of copper core wire is blue, and the flame of aluminum core wire is white. So everyone must polish their shining eyes and don’t be blinded by unscrupulous merchants ~ Hainan Iron and Steel
The difference between aluminum wire and copper wire:
1, copper wire and aluminum wire truncation process is different;
2. Aluminum wire is relatively cheap;
3. The quality of aluminum wire is lighter;
4. The mechanical strength of aluminum wire is poor;
5. Aluminum wire is easily oxidized at the end of the connecting wire, and the temperature will rise after oxidation at the end of the connecting wire.
6, copper wire internal resistance is small. The internal resistance of aluminum wire is larger than that of copper wire, but the heat dissipation speed is faster than that of copper wire. The main reason is that the current carrying capacity is different and the mechanical strength is different. 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. The mechanical strength of copper is much better.
Comparison of advantages and disadvantages between copper core wire (cable) and aluminum core wire (cable);
The resistivity of copper core is low: the resistivity of aluminum core is about 1.68 times higher than that of copper core;
The copper core has good ductility;
The strength of copper core is high: the allowable stress at room temperature can reach 20 for copper and 15.6 kgt/mm2 for aluminum;
Copper core has good stability and corrosion resistance: copper core is resistant to oxidation corrosion, while aluminum core is prone to oxidation corrosion.
Although the aluminum core is relatively cheap, in addition to being cheap, most of the time what is left is a piece of chicken feather, especially when it is used in some products, it is still necessary to be cautious.