1. Conductors
1. Color
High-quality copper is called "red copper" or "red copper" – as the name suggests, this copper is reddish, purple, and dark red in color.
The worse the copper, the lighter the color and the more yellow it is, which is called "brass".
2. Thickness
First of all, we must choose a color, and between the same colors, we can compare the thickness to judge which is better or worse. If the color is at odds with the thickness, remember to choose according to the color first, for example, between thinner copper and coarser brass, you should choose copper.
The thicker the conductor, the stronger the conductivity - when comparing the thickness, only the conductor should be compared, and the thickness of the insulation layer should not be added.
Second, the insulation layer
The insulation layer can not only avoid the harm of external elements to the conductor (maintenance of the conductor), but also maintain the damage to the outside world (insulation, flame retardant) after the occurrence of the conductor. To judge the quality of the insulation layer, the following three methods can generally be used:
1. Touch
If the appearance is rough, it proves that the production process of the insulation layer is poor, and it is easy to cause leakage and other problems.
If you press the insulation with your fingernails, if it can rebound quickly, it proves that the insulation layer is thick and resistant.
2. Bending
Take a piece of wire, bend it back and forth several times, and then straighten the wire for investigation. If there are no traces on the surface of the wire, it proves that the wire is more resistant. If the surface of the wire has obvious indentation and severe whitishness, it proves that the wire resistance is poor.
3. Burn
Use a lighter to continue incinerating the wire until the wire insulation catches fire. After that, the closed lighter starts to time - if the wire can be automatically extinguished within 5 seconds, it proves that the wire is more flame retardant. Otherwise, it proves that the flame retardant of the wire is not up to standard, and the circuit is overloaded or the circuit is easy to cause fire.
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