How to Select Cable Trays for Installation in Angola

Cable trays in Angola can be installed using wall-mounted, ceiling-suspended, or floor-supported methods, with careful planning, proper support spacing, and adherence to safety standards.

Planning and Preparation

Before installation, it is essential to review approved shop drawings showing tray routes, dimensions, support systems, and the type of cables to be installed . Materials such as ladder trays, perforated trays, solid-bottom trays, and wire mesh trays should be inspected for damage and stored properly to prevent moisture or sunlight exposure . Coordination with other services like HVAC, plumbing, and fire protection is necessary to avoid clashes .

Installation Methods

1. Wall-Mounted Installation
   • Cable trays are fixed directly to walls using brackets or clamps.
   • Suitable for vertical runs or areas with limited ceiling space.
   • Supports are typically spaced 1.5 to 3 meters apart depending on tray type and load .
2. Ceiling-Suspended Installation
   • Trays are hung from ceilings using threaded rods, Unistrut channels, or hangers.
   • Ideal for open spaces or industrial areas where floor space must remain clear.
   • Vertical distance between multiple layers of trays should be maintained (e.g., 30 cm between power and communication trays) to prevent interference .
3. Floor-Supported Installation
   • Trays are mounted on floor stands or pedestals, often used in plant rooms or service corridors.
   • Provides stability for heavy cable loads and allows easy access for maintenance .

Support Systems and Spacing

• Supports include brackets, clamps, threaded rods, and scaffolding for elevated installations .
• Proper spacing ensures load distribution and prevents sagging. Ladder trays typically require supports every 1.5–3 meters, while solid-bottom trays may need closer spacing .
• For bends and junctions, use appropriate fittings to maintain minimum bend radius and structural integrity .

Material Considerations

• Common materials include galvanized steel, stainless steel, aluminum, and fiberglass, chosen based on environmental conditions and corrosion resistance .
• Covers or solid-bottom trays may be used in areas with dust, moisture, or electromagnetic interference concerns .

Safety and Compliance

• Follow IEC 61537, NEC Article 392, and local building codes for installation standards .
• Ensure proper grounding, labeling, and inspection after installation.
• Use scaffolding, lifting equipment, and personal protective equipment to comply with safety regulations .

Step-by-Step Summary

1. Review shop drawings and plan tray routes.
2. Inspect and prepare materials.
3. Install supports (wall, ceiling, or floor).
4. Mount trays and secure with clamps and fittings.
5. Maintain proper spacing and vertical separation.
6. Lay cables, ground trays, and label circuits.
7. Conduct final inspection and testing . By following these methods, cable tray installations in Angola can be efficient, safe, and compliant with international standards, ensuring long-term reliability and ease of maintenance.