Cable tray rivet installation techniques

Rivets can be effectively used to join and secure cable tray sections by ensuring proper alignment, pre-drilling, and controlled fastening to maintain structural integrity and cable safety.

Preparation and Tools

Before installing rivets, ensure you have the correct personal protective equipment (PPE), including gloves, safety glasses, and a dust mask if cutting trays. Required tools include a drill with appropriate bits, a rivet gun or hand riveter, measuring tape, level, and clamps to hold sections in place during fastening . Pre-drill holes slightly larger than the rivet diameter to allow for alignment adjustments and prevent tray deformation .

Alignment and Support

Proper alignment is critical. Place the tray sections on supports such as cantilever wall brackets or trapeze hangers, ensuring they are level and spaced according to manufacturer specifications (typically 1.5–3 meters), . Use clamps to hold the sections together while inserting rivets to maintain a flush joint and consistent spacing.

Rivet Installation Steps

1. Mark Rivet Locations: Typically, rivets are placed at the ends of tray sections and along splice plates or couplers to secure joints .
2. Pre-Drill Holes: Drill holes through both tray sections or through the splice plate, ensuring they are slightly larger than the rivet shank for easy insertion .
3. Insert Rivets: Place the rivet through the aligned holes.
4. Set Rivets: Use a rivet gun to expand the rivet, securing the sections together. Ensure the rivet head is flush with the tray surface to avoid cable damage .
5. Check Tightness: Verify that all rivets are fully set and that the joint is stable without over-tightening, which could crack FRP or deform metal trays .

Best Practices

• Maintain expansion gaps where required to accommodate thermal expansion, especially for long runs .
• Avoid placing rivets too close to tray edges to prevent cracking or weakening the tray material .
• For FRP or composite trays, handle carefully to prevent fiber damage and wear PPE to avoid irritation from dust .
• Inspect all riveted joints after installation to ensure structural integrity and proper alignment before laying cables .

Additional Considerations

• Rivets are ideal for light to medium loads; for heavy cable trays, consider using bolts or splice plates in combination with rivets for added strength .
• Ensure compliance with NEC Article 392 and local electrical codes regarding tray support, spacing, and fill limits .
• When installing bends, tees, or risers, rivets can secure couplers or splice plates, but always verify that the tray remains level and properly supported . By following these techniques, rivet installation can provide a secure, durable, and code-compliant cable tray system suitable for both metal and FRP trays.