Wire is a must-have material for home improvement. Be careful when buying wires because it is related to our home safety. So how do you know if the wire you bought is genuine? How can you tell if the wires you bought are not cut corners? Xiaobian tells everyone with the experience of production personnel.
Take the BV2.5 square format as an example. Such lines are the most commonly used specifications in the home.
The national standard prescribed by the state (hereinafter referred to as the national standard) is 100 meters in length, the wire diameter is 1.78mm, and copper is used as copper.
one. length
This is one of the often-used tricks in cutting corners. Some people may say that the number of meters I have bought on the wire is 100 meters. You should pay attention. He has a rice mark, but in the middle part, there are some profiteers. It's 10 meters less. For example, after 30 meters, it will begin to mark 40 meters.
If you take a little ruler, isn't it troublesome?
Recommend a calculation method to everyone, the error is within 1 meter.
panda
As shown in FIG:
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: 12×16×0.165×3.14=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.
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