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Views: 89 Author: Site Editor Publish Time: 2022-07-19 Origin: Site
(1) Do not overfill
Do not overfill the wire cable baskets of the cables and do not exceed the code range. Avoid using tray systems that are too large and difficult to move. Instead, plan cabling paths and proactively consider parameters such as rack density, cable type, cable count, cable diameter, end device cable entry and room height.
Companies choose a basket size that matches the size of their facility. For example, a standard tray can be between 12 and 20 feet in length, which can be difficult to maneuver if an enterprise has a smaller server room. Alternatively, a 10-foot wire cable basket may be used to increase maneuverability.
(2) Coding varies by cable type
For multi-conductor control and/or signal cables, strict compliance with the National Electrical Code (NEC) 2017, Section 392.22.2 of Article 392, Cable Trays: Ladder or Ventilated Channel Cable Trunking Containing Multi-Conductor Control and/or Signal Cables, is required, which states that the allowable cross-sectional fill rate for the use of these cables is fill rate of 50%. In other words, the sum of the wire cross-sections must be half of the total cross-sectional area of the basket tray itself.
For multi-conductor power cables rated at 2000 volts or less, the NEC 2017 needs to be completed in accordance with Table 392.22(A).
Contractors typically purchase a larger width than required for the application to allow for future modifications to the electrical wiring of the cable. Consider how often an additional conduit lay will be required after the job is completed. If using the proper size, use cable trays where the only load is the cable.
(3) Do not use galvanized steel brackets
Tiny zinc whiskers can cause serious damage to sensitive electronic equipment by disrupting daily equipment operation. Their failure may include short circuits, voltage variations, signal interference, and complete system resets.
Zinc whiskers are caused by tiny "burrs" on the surface of galvanized zinc steel. Although the very thin zinc coating prevents rust and corrosion, it is under extrusion stress and will relieve this stress through the splitting effect of the zinc whiskers. Eventually, these zinc whiskers fall off and that is when the damage occurs. Individual zinc whiskers may circulate through the air system of the cooling equipment and settle on sensitive electrical equipment. So how do you avoid these potentially damaging whiskers? The answer is simple: reduce or eliminate the amount of galvanized steel used in and under server rooms. To do this, alternative support materials need to be selected.
Whether an enterprise's equipment needs a complete overhaul or just a few upgrades, better cabling and cable management solutions are needed to make the enterprise's data center more efficient, secure and organized.
