Should cable trays be installed overhead

Overhead cable trays are installed by securely mounting support brackets to the ceiling, aligning and connecting tray sections, and properly routing and securing cables while ensuring grounding and spacing compliance.

Planning and Preparation

Before installation, plan the tray layout according to cable type, load, and future expansion needs. Determine the tray type (ladder, perforated, wire mesh, or solid-bottom) and calculate the required width and depth based on the number and size of cables . Identify ceiling attachment points and ensure the structure can support the tray load.

Mounting Supports

Overhead trays require secure supports, such as trapeze hangers, center-span supports, or wall brackets anchored to the building structure . Supports should be spaced 1.5 to 3 meters apart, depending on tray type and load, to prevent sagging . Use appropriate hardware kits to attach brackets and ensure they are level and aligned.

Installing Tray Sections

1. Lift tray sections carefully using cranes, hoists, or manual handling for smaller sections . Avoid using the tray itself as a lifting point.
2. Connect sections using bolted splices or splice plates to ensure structural integrity .
3. Incorporate fittings such as horizontal bends, vertical risers, tees, and reducers to navigate changes in direction or elevation .
4. Check alignment and level throughout the installation to maintain a straight and stable run.

Cable Routing and Securing

Once the tray is installed, lay cables neatly, separating by voltage or function. Use cable ties or straps to organize bundles and leave slack for expansion or future adjustments . For wire mesh trays, integrated sidewalls help contain high volumes of cables .

Grounding and Bonding

Metal trays must be properly grounded to ensure safety and compliance with electrical codes. Use bonding jumpers across tray sections to maintain electrical continuity .

Final Steps

• Label cables and document the layout for maintenance and troubleshooting .
• Inspect the installation for secure connections, proper support spacing, and cable organization.
• Ensure corrosion protection if trays are exposed to moisture, using appropriate finishes like powder coating or electro-zinc . By following these steps, overhead cable trays can be installed safely, efficiently, and in a way that allows for easy maintenance and future expansion.