In real life, lighting wires, decorative wires, and surfaces have a layer of insulating skin made of plastic or rubber. Prevent metal conductors from contacting each other, and most importantly, prevent exposed conductors from leaking. How to judge the quality of wire insulation layer?
Therefore, the quality of the insulation layer is directly related to the service life of the cable. If even the quality of the insulation layer cannot be guaranteed, it is conceivable that the quality is better than that of the more expensive copper wire. It is not difficult to choose wires by insulation layer, as long as you follow the steps below:
1 Pull: High-quality insulation is not easy to deform and break when pulled hard.
Cutting: If there are no bubbles in the white color and the filling is also tight, you can cut a section and observe the insulation part carefully.
3 Fold: Take out a small section of wire and bend it arbitrarily. There is no breakage at the bend, no white marks, and the wire body is soft and tough.
4 Wear: Repeatedly rub the insulation, the surface is bright, indicating that the material is firm.
5 Sunlight exposure: Expose the insulation layer to sunlight. The insulation layer will not change color and dissolve. It has strong stability. At high temperatures, the molecular structure is stable and not easy to decompose. High-quality insulation has multiple resistances.
6 Burning: When the wire is ignited, the inferior insulation layer will cause a lot of black smoke, while the high-quality insulation layer has only a small amount of white mist. In the event of a fire, the strong black smoke will block escape. The sight distance of the high-quality insulation layer reaches 60 meters, which greatly increases the probability of escape.
7 Smell: The inferior insulation layer has a pungent smell; while the high-quality environmentally friendly insulation layer will not produce a pungent smell even under burning conditions, which will cause choking and hinder escape.
The insulation layer is an insulating material layer between the heating wire or the heating wire and the grounding shielding layer. Therefore, the quality of the insulation layer is very important.