With the rapid development of electronic information, information transmission requirements are becoming increasingly stringent. Conventional computer cables may not meet customer requirements in certain special situations. To help customers better select and apply computer cables, we offer the following recommendations for computer cable selection and installation:
1. Cable Selection
According to TICW6-2009, "Computer and Instrument Cables," computer cables are used for signal transmission in electronic computer systems, monitoring circuits, and automation control systems, as well as for connecting test instruments and meters.
1) Material Selection
① For low-traffic, low-density, or non-public settings, PVC insulation or sheathing materials are generally used.
② For high-traffic, densely populated public settings (such as subway stations, shopping malls, and cinemas), polyolefin or halogen-free, low-smoke, flame-retardant materials are generally used.
③ For analog signals, input/output signals, switching signals (digital signals), sensors, encoders, fieldbuses, and other applications, dedicated communication cables are recommended. The user should consult the Technical Research Institute for recommendations on appropriate cables based on their specific application environment.
2) Shielding Material Selection
① When used in low-frequency electromagnetic interference (EMI) or mobile applications, copper wire braided shielding is generally used.
② When used in low-frequency EMI, mobile applications, or applications subject to corrosion, tinned copper wire braided shielding is generally used.
③ When used in RF interference, fixed applications, or applications with humidity, aluminum-plastic composite tape wrapping is generally used.
④ When used in RF interference, applications requiring high flexibility, and applications with relatively weak interference, copper-plastic composite tape wrapping is generally used.
⑤ When used in RF interference, fixed applications, and applications with relatively strong interference, copper tape wrapping is generally used.
⑥ When used in applications with mixed high and low frequency interference, aluminum-plastic composite tape + copper wire braided shielding is generally used.
3) Armor Material Selection
Armor is divided into two types: steel tape armor and steel wire armor. When laying cables underground, they may be subject to a certain amount of positive pressure during operation. Therefore, a steel belt armored structure can be selected. When laying cables in locations subject to both positive pressure and tension (such as vertical shafts or locations with large drop heights), a steel wire armored structure can be selected.
2. Installation and Laying
Cable laying should be carried out in accordance with GB 50168-2006, "Specifications for Construction and Acceptance of Cable Lines for Electrical Installation Engineering." Basic Requirements:
① When laying cables, the average temperature for the 24 hours prior to installation and the temperature at the installation site should not be below 0°C. If the temperature falls below 0°C, heating measures should be implemented.
② Flame-retardant and non-flame-retardant cables should not be mixed in the same channel. Cables laid in the same channel should preferably have the same or similar flame retardancy ratings.
③ When laying computer cables together with power cables, they should be separated from each other. In the same space, power cables should be placed on top and computer cables on the bottom, with fire-proof isolation measures in between to prevent splashing.
