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Tray-type cable tray suspension installation

Tray-type cable tray suspension installation

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Cable tray suspension is typically installed using ceiling-mounted trapeze hangers or C-hangers, ensuring proper support spacing, leveling, and secure attachment to structural elements.

Planning and Preparation

Before installation, review the approved shop drawings to determine the tray layout, length, and support locations. Inspect all materials for compliance with specifications and check for damages. Ensure the installation area is clear of obstructions such as pipes, HVAC ducts, or other equipment. Gather necessary tools including a power drill, wrench set, measuring tape, level, hacksaw or angle grinder, and personal protective equipment (PPE) like gloves, safety glasses, and a hard hat .

Support Methods

Cable trays can be suspended using two common methods:

  1. Ceiling Suspension (Trapeze or C-Hanger)
    • Drill holes into the structural ceiling slab and install drop-in anchors.
    • Screw in threaded rods to the anchors.
    • Attach a horizontal Unistrut channel or trapeze hanger between two threaded rods to create a shelf for the tray.
    • Use nuts and washers to level the strut.
    • Ensure support spacing follows manufacturer specifications, typically every 1.5 to 2 meters, depending on tray type and load .
  2. Wall Mounting (Cantilever Brackets)
    • Drill holes at marked support points on the wall.
    • Insert wall anchors (expansion bolts for concrete).
    • Secure cantilever brackets to the wall, ensuring they are level.
    • This method is suitable for vertical or horizontal runs along walls .

Installation Steps

  1. Mark the Route: Use a chalk line or laser level to mark the tray path on the ceiling or wall. Identify locations for bends, tees, or elevation changes.
  2. Install Supports: Fix trapeze hangers or wall brackets at marked points. Ensure all supports are level and aligned.
  3. Measure and Cut Trays: Cut tray sections to required lengths using a hacksaw or angle grinder. Deburr edges to prevent cable damage.
  4. Place Tray Sections: Lift trays onto supports and secure with hold-down clips or bolts to prevent movement.
  5. Join Sections: Connect tray sections end-to-end using couplers or splice plates. Ensure proper alignment and secure fastening.
  6. Check Leveling and Alignment: Verify that all trays are level and properly aligned along the route. Adjust supports as necessary .

Safety and Compliance

  • Follow National Electrical Code (NEC) Article 392 and local regulations for tray fill ratios and support spacing.
  • Ensure trays are not overloaded; overfilling can cause overheating and damage.
  • Use materials and components that comply with BS EN 61537 or equivalent standards for cable support systems.
  • Avoid using trays as walkways or ladders to prevent personal injury and system damage .

Final Checks

After installation, inspect all connections, supports, and tray sections. Verify that the system can safely support the intended cable load, including allowances for wind, ice, or other environmental factors. Ensure proper grounding and bonding of the tray system to maintain electrical safety . This method ensures a safe, code-compliant, and durable cable tray suspension system suitable for industrial, commercial, or electrical room installations.

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