Computer cable The shielding density shall be in strict accordance with the standard. The sub shielding density shall reach 85%, and the total shielding density shall reach 95%. Some units cut corners, the sub item shielding density is only 40%, and the total shielding density is only 50%, which seriously affects the product quality. Some customers want a cheap price, but they get the product quality. The product quality is seriously substandard, which directly affects the product quality.
The computer shielded cable is used for the circuit of the communication line and the transmission line, and the main purpose is to prevent the fluctuation of the power grid from causing electromagnetic interference; It is also used in some places with harsh environment and special conditions, such as coal mines. For safety, it is also used to prevent some interference or shield its own magnetic field to avoid injury.
Polyethylene is a widely used plastic with large consumption. With low meson loss, high resistivity, high breakdown field strength, good weather resistance and processability, polyethylene is the best electrical insulation material at present. However, due to its low operating temperature, it is mainly used as the insulation of communication cables. Medium density and high density polyethylene have high strength and hardness, low water permeability, and are mostly used as cable sheath. However, polyethylene has some disadvantages, that is, it is easy to burn and has strong black smoke, so its application has brought many hidden dangers to the environment.
The fire caused by computer cable workers and improper decoration is one of the main reasons for family fires, of which 30% are caused by old residential electrical lines or improper construction. 1) How should wires and cables be handled? In the decoration site, avoid breaking up coiled wires and cables and store them away from open fire. It is also inappropriate to directly expose wires, cables and computer cables to sunlight or ultra-high temperature, especially the wires used for construction. The installed wires must be covered with plastic or metal tubes to avoid artificial damage.
When the cable crosses the railway or road, it shall be protected through a pipe, which shall extend 2m beyond the track or road surface. In that year, corporate profits doubled. 4. The distance between the cable and the building foundation shall ensure that the cable is buried outside the building apron; When the cable is led into the building, it should be protected through the pipe, and the protective pipe should also be beyond the building apron. 5. The distance between the cable directly buried underground and the grounding of general grounding device shall be 0.25~0.5m; The buried depth of cables directly buried underground should generally not be less than 0.7m, and should be buried under the frozen soil layer.
