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With the development of human industrial civilization, electric power is widely used, and wires and cables are widely used in thousands of households. More than 30 years ago, in the myth, no matter upstairs or downstairs, the electric telephone was far away. Now, everything can be seen everywhere.When it comes to the development of electricity, we have to mention the important medium of wire and cable. Less gossip. Today, I will talk about why some physical stores sell wires and cables cheaper than manufacturers.

Overhead wire and cable

Development trend of mining cable technology

As we all know, the quality of a product is good or bad, its first characteristic is reflected in the appearance of the product quality. Any product or semi-finished product, in the production process must pay attention to the appearance, strict control. And check. The sheath of the sheath line is the appearance of the cable, so the appearance needs to be round and smooth, uniform luster, no eccentricity (not exceeding the prescribed deviation), no mechanical damage, squashed, no visible debris, bubbles, bubbles, obvious particles, bamboo section shape, twisted shape, etc. In addition to meeting the above quality requirements, the thickness of the sheath also has a certain impact on the quality of the internal cable.

When the photovoltaic cable in the operation process through a certain load current, will produce a certain amount of heat, with the increase of the cable load current, the cable surface temperature will be gradually higher, if not treated in time, the consequences can be imagined, such as PVC cable, to the core temperature of 70 degrees as the upper limit, the surface temperature will be 5-10 degrees lower, therefore, The surface temperature of photovoltaic cable is basically safe below 60 degrees. From the point of view of power maintenance, the lower the temperature, the better.