Drilling and connecting cable tray supports

Cable tray supports are installed by selecting appropriate anchors, drilling precise mounting holes, and securely connecting trays using approved fasteners and support methods.

Planning and Preparation

Before drilling or connecting supports, review the approved shop drawings and specifications to confirm tray layout, dimensions, and mounting heights . Inspect the site for accessibility, safety, and potential interference with other trades . Ensure all trays, conduits, and accessories are free from damage and clearly labeled by feeder or branch number .

Selecting Support Methods

Common support methods include:

• Trapeze hangers for ceiling suspensions
• Cantilever wall brackets for vertical or wall-mounted runs
• Strut channels or threaded rods for adjustable support The choice depends on the building structure, tray type, and load requirements. Support spans must comply with manufacturer load charts and standards such as NEMA VE 1 .

Drilling and Anchoring

1. Mark the mounting points on walls, ceilings, or floors according to the tray layout.
2. Select anchors suitable for the substrate (e.g., metal anchors for concrete, toggle bolts for hollow walls), .
3. Drill holes using an electric drill or hammer drill, ensuring correct diameter and depth for the chosen anchor .
4. Insert anchors and secure the support brackets or strut channels. For OBO systems, some anchors can be installed without drilling, using knock-in metal anchors for efficiency .

Connecting Cable Trays

• Place the tray sections on the installed supports.
• Align tray ends and use bolts, nuts, and tray connectors to join sections securely .
• Ensure proper grounding and bonding according to NEC requirements.
• Verify that trays are level and properly supported along the entire run.

Safety and Compliance

• Always wear personal protective equipment (PPE) during drilling and installation.
• Avoid overfilling trays; calculate cable fill according to NEC 392.22 to prevent overheating .
• Coordinate with other trades to prevent interference and maintain safe working conditions . By following these steps, cable tray supports can be efficiently drilled, anchored, and connected, ensuring a safe, durable, and code-compliant installation.