How to match cable tray screws

Select screws and bolts based on the cable tray type, load, and fittings, using manufacturer-recommended fasteners like truss-head bolts, combination nuts, or clamps for secure installation.

Identify the Cable Tray Type and Fittings

Cable trays come in perforated and unperforated versions and vary in width (100–600 mm) and side height (35–110 mm) depending on the system and load requirements . Fittings include bends, tees, reducers, cross-overs, and covers. Each fitting may require specific fasteners: some can use double clamps (DOP A2) or truss-head bolts (FRS) with combination nuts, while certain vertical bends or low-height fittings must be screwed directly .

Choose the Correct Fasteners

• Truss-head bolts (FRS) and combination nuts: Commonly used for joining tray sections and securing fittings. They provide strong, reliable connections and allow disassembly if needed .
• Double clamps (DOP A2): Used to attach fittings to tray rails, especially for bends and junctions .
• Splice plates and bolts: Flat metal plates with pre-drilled holes are used to join straight tray sections. Bolts and nuts secure the plates, ensuring stability and load-bearing capacity .
• Quick-connect systems: Some manufacturers offer snap, slide, or twist fittings that require minimal tools and speed up installation, but they are usually brand-specific .

Installation Tips

1. Align connector holes: Ensure tray sections and fittings are properly aligned before inserting screws or bolts .
2. Use the correct torque: Tighten bolts to the manufacturer's recommended torque to prevent loosening or damage. Tools like spanners or torque wrenches are typically required .
3. Secure covers: Covers may come with pre-mounted turn buckles or require separate fastening. Ensure they are properly attached to protect cables .
4. Support spacing: Mount trays on floors, walls, or ceilings using appropriate support systems, following spacing guidelines to prevent sagging .
5. Safety precautions: Wear protective gloves to avoid cuts from tray edges and ensure only trained personnel perform electrical installations .

Summary

Matching cable tray screws involves selecting the right fasteners for the tray type and fittings, aligning sections correctly, and securing them with bolts, nuts, or clamps according to manufacturer specifications. Proper installation ensures system stability, safety, and long-term durability while allowing for future maintenance or modifications .