Water inlet and waterproof problem of structured wiring system

This paper examines the impact of water on the data cable and what impact the water will have on the cable, and discusses how IT managers and cable installers should be aware of the possible impact of the floods on the cabling system and what measures can be taken to prevent losses.

Impact on the performance of electronic equipment
Data cabling System flooding can have a significant impact on the ability of cable to support high-speed data applications. In some cases, cables that are close to the standard link length limit may fail when they are in the water. This is because when the cable is wet, its insulation performance will change, will affect the impedance and attenuation and echo loss and other related parameters.

Cable structure and water intake
It is generally thought that PVC material that is covered outside the standard data cable is waterproof, but the PVC material is hygroscopic. The standard ultra five type cable and the six type cable all use the PVC jacket, is for the interior design, is not suitable for the damp environment.

For any number of fog or water in the outdoor environment, the design of the cable will take waterproof measures, such as water blocking tape and gel filling, these methods are costly, and sometimes reduce electrical performance. Moreover, these waterproof gels are based on oil and have fire hazards and are not suitable for indoor use (except for the point of continuation). In fact, the distance that these cables can be laid in a building is usually restricted by national standards.

In addition, the structure of the cable will also affect water intake. Low Smoke 0 Halogen (LSZH) cables are generally less capable of water intake because of the moisture absorption capacity of the outer skin material; The use of longitudinal foil shielding of the FTP cable shielding material is similar to the adhesive tape, to prevent water intake is better. However, FTP is still not "waterproof." ---http://bianceng.cn (computer science)

Severity of exposure
The impact of the influent also depends on the source of the water and the time of the influent. The laying of PVC cable, the middle of the short period of exposure to a small amount of clean water, will not produce any long-term adverse effects; the low smoke 0 halogen cable laid directly on the concrete floor does not use any pipelines or protective measures, as long as the water is submerged for a week, the risk of loss will be much greater; from the dusty cement floors, Water that contains dissolved contaminants can have a greater risk.

In addition to the impact of water intake through the cable, the beginning of the cable will be a much greater threat of immersion: the tight twisted pair in the data cable will promote the capillary reaction and may be able to inhale water from far away into the cable, damaging the electrical properties of the cable. All cables affected by this effect must be replaced.

Early prevention is better than late recovery
The replacement of damp cabling system is time-consuming, high cost and strong destructive. Obviously, the best way is to prevent the cable from being damp. Enterprises located in high-risk areas should consider the risk of damp during the network design phase, and the existing wiring network should also consider what measures to take.

If possible, cable should be suspended in a pipe in the ceiling space. This is lower than the floor wiring to reduce the risk of damp; Through the use of pipelines, such as cable racks, when the cable is damp can be faster to dry the cable, the sealing pipe can better prevent a small amount of water immersion; If the cable must pass through the floor space, you should make the cable tray or cable rack as high as possible on the floor plane within the allowable height range , so it is best to keep the plumbing away from areas where there is a large concentration of cables, in the case of telecommunications or equipment, do not set up a kitchen or toilet in the vicinity; Do not place telecommunications or equipment between the basements, especially in adjacent rivers; if isolation is not possible, consider using a rack or cabinet or establishing a bank, Divert the flow to a less affected area.

Conclusion
When the cable is damp, the measures to be taken depend on the number of cables affected, the cost of replacement and the risk of loss of business to not replacing the cable, and so on.

The cable that the capillary reacts to the beginning of the water through the cable should be replaced directly, and the cable may need to be replaced through the skin affected by severe influent. You should thoroughly test your network and seek advice from a manufacturer or trusted installer. If there is no doubt, the cable should be replaced.