Xiao Bian has always believed that the most important material in the hidden project is the wire. The quality of the wire brand on the market is also uneven, but if you know the following knowledge, it is also a matter of minutes to select the wire. 
Take the BV2.5 square as an example (this type of line is the most commonly used standard for households). The national standard (hereinafter referred to as the national standard) is 100 meters in length, wire diameter: 1.78mm, and copper is copper.
one. Length is one of the often used tricks in cutting corners. Some people would say that the number of meters I bought was above the meter. I watched it 100 meters. You should pay attention to it. He has rice, but in the middle part, some Profiteers are less 10 meters. For example, after 30 meters, it will begin to mark 40 meters.
If you take a little ruler, isn't it troublesome?
Xiaobian recommend a calculation method to everyone, the error within 1 meter.
Tips: as shown above:
Number of A: number of horizontal wires
B number: The number of the rooted wires
C Length: The length from the side of any side to the inner disk (in meters)
Without solving the disk, the number of meters of this wire = A number × B number × C length × 3.14
Such as a BV2.5 wire:
A number of roots: 12
Number of B: 16
C length: 16.5 centimeters, or 0.165 meters. The length of this wire is: 12 x 16 x 0.165 x 3.14 = 99.47 meters. The error is within 1 meter. Knowing this method, no matter what kind of wire, 2 squares, 4 squares, you just need to count a few, you can know the number of meters.
2. Wire diameter This is one of the most common ways of cutting corners and materials in the city factory. For example, the 2.5 square BV line, commonly known as the copper sheet, is a wire of copper wire. Why is it called 2.5 square? This is because the copper wire cross section of this wire is 2.5 mm2. That 2.5 square BV line, the copper wire diameter is 1.78mm
How to measure? Look at the picture below
From the figure we can see that this BV2.5 square wire, the diameter of the copper wire is 1.772mm because the country is allowed to have a certain error, so this error will be the default within the scope of the response. The reader should pay attention to it. Look at the picture. I am measuring from both ends of the wire.
The real profiteers will not be involved in both ends.
The hands and feet are in the middle part. The following diagram shows:
At both ends of the wire, it is a standard wire diameter, but after three meters, it begins to shrink, and cutting corners starts here.
So when you buy a wire, you say to the boss: “Is it not drawing in the middle?â€
The boss said: "No." Then you said: "Then I cut it and see it. If I pull it, I don't want it. I don't pay."
Can scare bad profiteers. Of course, the price after drawing and the price of not drawing are certainly not a price.
III. Copper quality The real copper is the color of red, while brass is yellow. In addition, the copper is soft and the brass is hard.
As long as you do not buy copper-clad aluminum (aluminum, but a layer of copper plating on the outside, generally applied to soft wires), brass is currently not too much fake.
4. PVC material is too professional. Not much to say.
To be sure, no one has made the copper wire very standard, and they have to cut corners on PVC. Because a ton of PVC is also good but 8,000 yuan.
One ton of copper is 59,000 yuan. So many people can cut corners on copper materials.
Take the BV2.5 square as an example (this type of line is the most commonly used standard for households). The national standard (hereinafter referred to as the national standard) is 100 meters in length, wire diameter: 1.78mm, and copper is copper. one. Length is one of the often used tricks in cutting corners. Some people would say that the number of meters I bought was above the meter. I watched it 100 meters. You should pay attention to it. He has rice, but in the middle part, some Profiteers are less 10 meters. For example, after 30 meters, it will begin to mark 40 meters. If you take a little ruler, isn't it troublesome?
Xiaobian recommend a calculation method to everyone, the error within 1 meter.
Tips: as shown above: Number of A: number of horizontal wires
B number: The number of the rooted wires
C Length: The length from the side of any side to the inner disk (in meters)
Without solving the disk, the number of meters of this wire = A number × B number × C length × 3.14
Such as a BV2.5 wire:
A number of roots: 12
Number of B: 16
C length: 16.5 centimeters, or 0.165 meters. The length of this wire is: 12 x 16 x 0.165 x 3.14 = 99.47 meters. The error is within 1 meter. Knowing this method, no matter what kind of wire, 2 squares, 4 squares, you just need to count a few, you can know the number of meters.
2. Wire diameter This is one of the most common ways of cutting corners and materials in the city factory. For example, the 2.5 square BV line, commonly known as the copper sheet, is a wire of copper wire. Why is it called 2.5 square? This is because the copper wire cross section of this wire is 2.5 mm2. That 2.5 square BV line, the copper wire diameter is 1.78mm How to measure? Look at the picture below
From the figure we can see that this BV2.5 square wire, the diameter of the copper wire is 1.772mm because the country is allowed to have a certain error, so this error will be the default within the scope of the response. The reader should pay attention to it. Look at the picture. I am measuring from both ends of the wire. The real profiteers will not be involved in both ends.
The hands and feet are in the middle part. The following diagram shows:
At both ends of the wire, it is a standard wire diameter, but after three meters, it begins to shrink, and cutting corners starts here. So when you buy a wire, you say to the boss: “Is it not drawing in the middle?â€
The boss said: "No." Then you said: "Then I cut it and see it. If I pull it, I don't want it. I don't pay."
Can scare bad profiteers. Of course, the price after drawing and the price of not drawing are certainly not a price.
III. Copper quality The real copper is the color of red, while brass is yellow. In addition, the copper is soft and the brass is hard. As long as you do not buy copper-clad aluminum (aluminum, but a layer of copper plating on the outside, generally applied to soft wires), brass is currently not too much fake.
4. PVC material is too professional. Not much to say. To be sure, no one has made the copper wire very standard, and they have to cut corners on PVC. Because a ton of PVC is also good but 8,000 yuan.
One ton of copper is 59,000 yuan. So many people can cut corners on copper materials.
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