ZITHA SPECIALTYSPECIALTY FIBER CABLES Technical Inquiry

Vertical Shaft Cable Tray Branch

A vertical shaft cable tray branch joint connects a vertical riser to horizontal floor trays, requiring proper support, grounding, and alignment to ensure safe and efficient cable routing.Overview

A vertical shaft cable tray branch joint is used in multi-story buildings to distribute cables from a main vertical riser to horizontal trays on each floor. These joints are typically formed using vertical tees or elbows, allowing cables to sweep smoothly from the vertical tray into horizontal runs . Proper design ensures minimal stress on cables and maintains electrical continuity.

Material and Coating

Vertical branch trays are often made from Sendzimir galvanized steel, which provides corrosion resistance through a zinc coating. Cut edges should be treated with galvanized paint to prevent rusting . Coating thickness is usually around 18–20 µm (Z 275), providing long-term protection against oxidation .

Installation Guidelines
  1. Support Structure: Vertical trays must be supported using trapeze or swing hangers, threaded rods, and cross members. The cross members should allow horizontal adjustment and be level with the tray bottom . Supports should be installed close to the joint, typically within 300 mm, to maintain stability .
  2. Alignment and Clearance: Ensure the vertical tray is truly vertical and horizontal trays are parallel to the building features. Maintain a minimum clearance of 75 mm from walls or other structures for cable installation and maintenance .
  3. Joint Assembly: Use elbows or tees to create the branch. Horizontal runs can start with a downward bend to allow cables to sweep from the vertical riser. Earth continuity strips should be installed at all joints to maintain grounding .
  4. Cable Protection: Remove sharp edges and burs before installation to prevent cable damage. Ensure load-bearing cleats are provided in vertical trays to support cable weight .
  5. Software Modeling: In BIM or CAD software, vertical tees may not be pre-defined. A practical approach is to create a vertical riser, then add horizontal runs with elbows, adjusting elevations to simulate the branch .
Best Practices
  • Verify all materials against approved submittals and QA/QC plans before installation .
  • Keep joints as close as possible to supports to reduce stress on the tray.
  • Provide expansion joints where trays pass through building expansion areas.
  • Ensure proper grounding and bonding for safety and code compliance. By following these guidelines, a vertical shaft cable tray branch joint can be installed safely, maintain structural integrity, and provide efficient cable routing across multiple floors.
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When planning cable pathways, the horizontal runs often get the most attention. However, the vertical cable tray is an

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Features Unique support keeps tray secure vertically. Fold-over tabs secure tray: no additional hardware needed es 2 supports for

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