Experts teach you how to purchase home decoration

Wire is a necessary material for home decoration. We must be careful when choosing wires, because it is related to our home safety

wires are necessary materials for home decoration. We must be careful when choosing wires, because it is related to our home safety. So how do you know if the wire you bought is genuine? How to identify whether the wires you buy are Jerry built? Xiaobian will tell you the experience of production personnel

take the bv2.5 square gauge as an example (this kind of wire is the most commonly used specification in families)

the national standard stipulated by the state (hereinafter referred to as the national standard) is 100 meters long, wire diameter: 1.78mm, and copper is red copper

1. Length

this is one of the tricks often used in cutting corners. Some people will say that the wire I bought is marked with meter number, and it is 100 meters. You should pay attention, he has meter mark, but in the middle part, some profiteers are less than 10 meters. For example, 40 meters will be marked after 30 meters

is it troublesome to take a ruler and measure it a little

recommend a calculation method with an error of less than 1 meter

panda

as shown in the above figure:

a number: number of wires on the transverse plane

b number: number of wires on the hard surface

c length: length from the edge of either side to the inner disc (unit: m)

do not solve the disc, the meter number of this disc of wires =a number × Number of B × C length × 3.14

for example, a plate of bv2.5 wires:

a number: 12

B number: 16

C length: 16.5 cm, that is, 0.165 meters

then the length of this plate of wires is: 12× 16× 0.165× 3.14=99.47 meters

the error is within 1 meter

after knowing this method, no matter what kind of wire, 2 square, 4 square, you just need to count it and measure it a little to know the number of meters

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