Methods for installing cable tray hangers

Proper installation of cable tray hangers ensures safe, stable, and code-compliant support for electrical cables.

Planning and Preparation

Before installation, plan the cable tray route and ensure the pathway is clear of obstructions such as pipes or HVAC ducts. Mark the support points along the ceiling or wall using a chalk line or laser level. Standard support spacing is typically 1.5 to 2 meters, but always check the manufacturer's specifications and local electrical codes, such as the NEC or CEC, for maximum tray fill and support intervals .

Selecting Materials

Choose appropriate cable tray hangers and supports based on load requirements and environmental conditions. Common materials include steel or stainless steel, often with galvanization for corrosion protection in wet areas. Hangers can be trapeze-style for ceiling suspension or cantilever wall brackets for vertical runs . Ensure all rods, brackets, and fasteners are rated to support the tray weight plus a 25% safety margin to accommodate future cable additions .

Installation Steps

1. Measure and Cut Rods or Brackets: Pre-cut threaded rods or support arms to the required length.
2. Install Anchors: Secure anchor bolts or mounting plates to the ceiling, wall, or structural beams.
3. Attach Hangers: Connect rods or brackets to the anchors, ensuring they are level and aligned.
4. Mount Cable Trays: Place the tray onto the hangers and secure with clamps or bolts. For multiple trays stacked vertically, use a heavy horizontal bar with two rods for stability .
5. Check Alignment and Load: Verify that the trays are level, straight, and capable of supporting the intended cable load. Maximum load per hanger typically ranges from 318 kg to 340 kg, with a maximum support spacing of 3.6 meters for center-hung trays .

Additional Considerations

• Bends and Tees: Mark locations for bends, tees, or risers and use appropriate fittings to maintain structural integrity .
• Grounding and Bonding: Ensure all trays and hangers are properly grounded to prevent electrical hazards .
• Future Expansion: Design the system to allow for additional cables without exceeding load limits or causing sagging . By following these steps and adhering to code requirements, cable tray hangers can be installed safely and efficiently, providing a durable support system for electrical wiring in commercial or industrial settings .