Computer cable belongs to electrical equipment cable, this cable is suitable for rated voltage 500V and below for high interference requirements of electronic computers and automation instruments. According to the requirements of different environments and devices, cable insulation can be polyethylene, polyvinyl chloride, and cross-linked polyethylene. The core insulation of the computer cable is made of low density polyethylene with good chemical stability. Polyethylene has high insulation resistance, good voltage resistance, small dielectric coefficient and medium loss affected by temperature and frequency, which can not only meet the requirements of transmission performance, but also ensure the service life of the cable.

Technical parameter

Rated voltage (U0/U):300/500V

The long-term operating temperature is 70℃

The ambient temperature during laying shall not be lower than: -40℃ for fixed laying and -15℃ for non-fixed laying

Bending radius: The unarmored layer should be less than 6 times the outer diameter of the cable, and the cable with armored layer should be not less than 12 times the outer diameter of the cable

At 20℃, the insulation resistance should not be less than 2500MΩ·Km after stable charging for 1min at 500V DC voltage test

The computer cable should be continuously routed between each pair of twisted shield and between the twisted shield and the total shield; Between the cable core and the cable core and between the cable core and the shield or other metal layer should withstand 50Hz, AC voltage 2000V/1min or 1500V/5min without breakdown. Polyethylene has high insulation resistance, good voltage resistance, small dielectric coefficient and the influence of dielectric loss temperature and variable frequency, which can not only meet the requirements of transmission performance, but also ensure the service life of the cable.

In order to reduce cross-talk and external interference between circuits, the cable needs to adopt a shielded structure. The shielding materials include tinned or non-tinned copper wire, copper strip, copper-plastic composite strip, aluminum-plastic composite strip, etc., of which the metal strip adopts the wrapping production method, and the covering rate should usually be not less than 15%, but the specific standards have special provisions, such as TICW/06 stipulates that the covering rate of the shielding metal strip should not be less than 25%; The metal wire adopts the braided production method, and the braided coverage rate should not be less than 80%, if there are higher requirements for countering interference, the coverage rate should not be less than 90%.

The shielding requirements of the cable are respectively adopted according to different occasions: sub-shielding (only the stranded group is shielded, and each pair of stranded groups is shielded), total shielding (the cable only has a total shielding layer after the cable core is formed), and sub-shielding + total shielding (including the above two structures at the same time). According to the higher requirements of users and use occasions, the total shielding structure can be a composite shielding method, that is, it contains two layers of shielding, which is composed of metal tape wrapping + metal wire weaving.

Note: If the cable has a separate shielding structure, the shielding pair should have good insulation performance, and polyester tape or other non-hygroscopic tape should be wrapped around the outside of the separate shielding.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.