Wire seller, tell me.

In fact, the purchase of wires mainly depends on two aspects: conductor and insulation. As long as these two parts are all right, it proves to be a good line.

I. Command

Take out a wire, peel off the insulation of the wire and expose the copper wire inside-this is the conductor. We can judge the quality of the conductor from two angles:

1. color

Although they are all called "copper", they are not 100% pure copper, and will contain impurities to some extent. The more impurities contained, the worse the conductivity of the conductor. The amount of impurities contained in a conductor is generally reflected in the color.

The best quality copper is called "red copper" or "red copper"-as the name implies, this copper is red and purple, purple and dark red.

The worse the copper, the lighter and yellower the color, which is called "brass". Some copper is light yellow-this copper has a high impurity content.

But this is not the worst. A few years ago, there was a kind of recycled crude copper, which was black as a whole and could not see the shadow of red and yellow (rare in recent years). This kind of copper has definitely failed to pass the national standard test, and it belongs to fake and shoddy products. You should not buy it.

2. Thickness

First of all, you should choose a color, and you can judge which is better by comparing the thickness of the same color-when the color conflicts with the thickness, you should first choose according to the color (for example, between fine copper and coarse brass, red copper is preferred).

In the case of the same wires, the thicker the wires here, the stronger the conductivity-when comparing the thickness, only compare the conductors, not the thickness of the insulation layer.

Second, the insulating layer

The rubber layer outside the wire is the insulation layer of the wire. Its existence can not only prevent external factors from causing damage to the conductor (protecting the conductor), but also protect the conductor from causing damage to the outside world after failure (insulation and flame retardant). Generally, the following three methods can be used to judge the quality of insulating layer:

1.

Touch the surface of the insulating layer with your hands. If the surface is rough, it proves that the manufacturing process of insulating layer is poor and it is prone to faults such as leakage.

Pressing the insulation layer with nails, if it can rebound quickly, proves that the insulation layer has high thickness and good toughness.

bend

Take a wire, bend it back and forth a few times, and then straighten it for observation. If there is no trace on the surface of the wire, it proves that the wire has good toughness. If the surface of the wire has obvious indentation and severe whitening, it proves that the toughness of the wire is poor. Buried underground for a long time, it is easy to age and become brittle, and it is easy to leak electricity in the future.

burn

Continue to light the wire with a lighter until the insulation of the wire catches fire. Then turn off the lighter and start timing-if the wire can go out automatically within 5 seconds, it proves that the wire is flame retardant. Otherwise, it is proved that the flame retardant ability of the wire is not up to standard, the circuit is overloaded or the circuit is easy to cause fire.

How to choose the thickness of home improvement wires?

We may also encounter such problems when buying wires. The wires are divided into different squares. Some people say that thick thread is good and has great current carrying capacity. Others said that there was no need to buy such a thick thread. How to choose the thickness of home improvement wires? Listen to the old electrician.

First, what is thickness?

The thickness is actually the square of the guide line. Generally, there are 1 square millimeter (abbreviated as 1 square), 1.5 square, 2.5 square, 4 square and 6 square, which refer to the cross-sectional area of copper wire. Generally, we usually use 1.5 square meters and 2.5 square meters in home decoration.

Second, how to choose the number of wires?

1, and 1.5 is enough for general lighting. Because the wattage of ordinary lighting lamps is not large, it is more appropriate to use 1.5 square meters.

2, the general socket uses 2.5 square meters. The electrical appliance in the socket may be larger than the wattage of the lamp. In general, 2.5 square meters is more than enough for us.

3, cabinet air conditioning with 4 square meters. The power of cabinet air conditioner is relatively large, so it is safer to use 4-way air conditioner. Hang up, in fact, 2.5 square meters can be put forward.

4. The main line of the kitchen is 4 square meters and the branch line is 2.5 square meters. The kitchen mainly involves some electrical appliances with relatively high power. If it is a branch line, it can be driven by 2.5 square meters, but for the main line, it is recommended to use 4 square meters for safety reasons.

5. The entrance line is 6 grids, and the entrance line is the main line of the whole family. Generally, 6 squares is enough.

Third, why can't we all have thick lines?

Some people think it is safer to install thick lines completely. But in this case, it will waste a lot of money. First of all, in terms of wire cost, thick wire is definitely more expensive than thin wire. In addition, because the total cross-sectional area of wires in a conduit can't exceed 40%, the thick wires can't actually fit several wires, which increases the cost of the conduit. Therefore, appropriateness is the best solution. If you don't use so much electricity at all, it's a waste to install thick wires.

I believe that after reading it, there is not much doubt about the purchase of wires.