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How to place cable heads in vertical cable trays

How to place cable heads in vertical cable trays

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Cable heads in vertical cable trays should be carefully formed with proper bends, supports, and protective measures to ensure safe, compliant, and durable cable routing.

Material and Tray Selection

Vertical cable trays are typically made from cold-rolled steel, galvanized steel, or aluminum alloy, with surface treatments like hot-dip galvanizing or electrostatic spraying to resist corrosion and meet mechanical strength requirements . The tray unit includes the tray, cover, and connectors, with a load-bearing capacity of at least 200 kg/m and fire resistance meeting GB 8624 Class B1 . Choosing the correct material ensures the tray can safely support the weight and stress of cables at the head.

Forming Cable Heads

Cable heads are the points where cables exit or enter the vertical tray. To make them:

  • Bends and Risers: Use pre-fabricated bends, tees, or reducers, or form them on-site using tools like bolt cutters for wire mesh trays . Ensure the bend radius meets the minimum bend radius of the cables to prevent damage .
  • Spacing and Support: Install supports on each side of bends with spacing ≤ 1.5 m, and straight sections ≤ 2 m . This prevents sagging and maintains cable alignment.
  • Protection of Cut Ends: When cutting wire mesh trays, the cut ends can be sharp. Use rubber caps or protective coatings to prevent cable damage and maintain electrical safety .

Installation Best Practices

  • Maintain a minimum clear distance of 300 mm from other services like ventilation ducts or water pipes .
  • When multiple trays are installed in layers, isolation plates should be used at crossings, and spacing between power and weak-current trays should exceed 150 mm .
  • Fix the tray using M12 or larger expansion bolts, avoiding lightweight walling for anchoring .
  • Bundle cables using adequate banding and balance them at the center to withstand forces, including short-circuit forces .

Safety and Compliance

  • Follow standards such as BS EN 61537 for cable trays and GB 50303 for vertical tray installation .
  • Ensure that cable trays are not used as walkways or for supporting personnel, as this can damage the system and compromise safety .
  • Firestop materials must be certified (GB 23864) when passing through fire compartments . By following these guidelines, cable heads in vertical cable trays can be installed safely, maintaining proper cable support, bend radius, and protection, while complying with relevant standards and ensuring long-term reliability.
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GENERAL INFORMATION

As demonstrated in the previous paragraph, Optical Cable Corporation''s cable can be installed in vertical rises for great distances.

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