What is used for cable binding in vertical shaft cable trays

Cables in vertical shaft cable trays are typically secured using tie-downs or cable ties anchored to the tray rungs to maintain position and prevent movement.

Methods for Cable Binding

In vertical cable tray installations, cables must be firmly secured to prevent slippage due to gravity. The most common method is using cable ties or lashing straps attached to the tray rungs, which act as anchor points for the cables. These ties help maintain proper spacing, prevent tangling, and ensure that the cables follow the intended path along the vertical shaft.

Ladder-

Type Cable Trays

Ladder cable trays are often used in vertical runs because their rungs provide convenient points for tying down cables. The rungs allow for secure attachment of cable ties, which is essential in vertical installations where the weight of the cable can cause movement or stress on the conductors. Proper rung spacing (typically 6 to 12 inches for small-diameter control and instrumentation cables) ensures that cables are evenly supported and reduces the risk of sagging or damage.

Safety Considerations

Vertical installations are inherently risky due to the gravitational force on hanging cables. In addition to cable ties, some installations may use support grips, pulling socks, or secondary steel wires as fail-safe measures to prevent free fall in case of tie failure. These measures are particularly important for high-voltage or heavy cables in shafts, mines, or high-rise buildings.

Standards and Best Practices

Adhering to standards such as IEC 61537 ensures that cable trays and their support systems are designed to handle the mechanical load of secured cables. Proper installation includes selecting the right type of cable tie, ensuring compatibility with the tray material, and maintaining recommended spacing to prevent overheating or mechanical stress. In summary, cable ties, lashing straps, and tray rungs are the primary components used for cable binding in vertical shaft cable trays, often supplemented with additional safety measures for heavy or high-voltage cables to ensure secure and safe installations.