Cable trays in computer rooms are fixed using supports such as rods, beam clamps, hangers, brackets, and fasteners like bolts and lock nuts to ensure stability and safety.
Common Methods and Hardware
1. Rods and Hangers: Pre-cut metal rods or trapeze hangers are commonly used to suspend cable trays from ceilings. They provide vertical support and can hold multiple trays stacked together, especially for heavy power or data cables. Rods are typically spaced 1.5 to 2 meters apart, with closer spacing for heavier cables to prevent sagging or bending .
2. Beam Clamps: For attaching trays to steel beams, beam clamps are used. These clamps grip the beam without drilling, providing a secure and less labor-intensive method to support trays .
3. Lock Nuts and Bolts: Lock nuts are essential for securing rods, brackets, and clamps, particularly in environments with vibration, such as near large machinery. They prevent loosening over time and maintain tray stability . Bolted connections are also used with splice plates to join tray sections end-to-end or at junctions, ensuring a strong mechanical connection .
4. Brackets and Trapeze Supports: Wall-mounted brackets or trapeze supports can hold trays horizontally or vertically along walls. These supports transfer the tray weight to the building structure and maintain alignment .
5. Splice Plates and Mechanical Fittings: Splice plates, fish plates, or quick-connect systems are used to join tray sections. They are fixed with nuts and bolts and provide flexibility for future maintenance or expansion .
6. Covers and Spacers: To protect cables from dust, chemical spills, or mechanical damage, covers and spacers are used within trays. They also help separate power and data cables to reduce electromagnetic interference .
Best Practices
- Ensure supports are evenly spaced and appropriate for the cable weight.
- Use lock nuts in areas with vibration to prevent loosening.
- Separate power and data cables using spacers or dividers to maintain signal integrity.
- Choose corrosion-resistant finishes like hot-dip galvanized steel in humid or wet environments .
- Plan for future expansion by leaving room for additional trays or modular accessories .
By using these supports and fasteners correctly, cable trays remain secure, organized, and safe, reducing the risk of cable damage, sagging, or electrical hazards in computer rooms.
