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Should vertical cable trays be supported by ladders or cable trays

Optical access and telecom site reference Published 02 Aug 2024

Use this reference to prepare product questions for CGWEB NETWORKS. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Vertical cable trays should generally be supported using vertical cable ladders or dedicated support systems, not by other cable trays.

Key Considerations for Vertical Support

Vertical cable trays carry the weight of cables along risers or walls, and proper support is critical to prevent sagging, kinking, or cable damage.

According to DI

N 4102 Part 12, vertical cable ladders (STL, STM, STIC) are classified as standard support systems and are designed to handle vertical cable loads safely, including fire-rated circuit integrity classes E30, E60, and E90. These ladders can be mounted directly to walls or suspended using specialized adapters, ensuring that cables remain secure and properly aligned. Why Not Use Cable Trays to Support Other Trays VerticallyCable trays are primarily designed for horizontal runs and moderate protection of cables.

While they can support cables along horizontal spans, using a horizontal tray to support another tray vertically is not recommended because it may not provide sufficient structural strength or stability for vertical loads. Vertical cable ladders, on the other hand, are engineered with rungs and side rails to distribute weight evenly and allow secure fastening of cables.

Installation Guidelines

Fastening Spacing: Vertical ladders should be fastened at intervals specified by the manufacturer, typically ≤1. 2 meters for standard ladders. Load Capacity: Ensure the ladder or support system can handle the total cable dead weight, including future additions.

Wall or Suspended Mounting: Ladders can be mounted directly to walls using wall connection angles or suspended with adapters if structural conditions prevent direct attachment. Fire Safety: For circuit integrity, vertical supports must comply with fire-rated standards, which vertical ladders are tested for, unlike standard cable trays.

Summary

For vertical cable runs, use vertical cable ladders or certified vertical support systems rather than relying on horizontal cable trays. This ensures compliance with safety standards, maintains cable integrity, and provides proper load distribution. Horizontal cable trays remain suitable for horizontal runs, while vertical ladders are specifically designed for risers and wall-mounted vertical installations.

Should vertical cable trays be supported by ladders or cable trays - CGWEB NETWORK INFRASTRUCTURE [PDF]

Should vertical cable trays be supported by ladders or cable trays
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