Installation of Combined Cable Trays in the UAE

Proper installation of combined cable trays in the UAE requires adherence to DEWA standards, careful material selection, correct support spacing, and strict cable segregation to ensure safety and longevity.

Types of Cable Trays and Selection

In the UAE, combined cable tray systems often integrate ladder trays, wire mesh trays, and trunking systems to accommodate both power and data cables. Key considerations include: Ladder Cable Trays: Ideal for heavy power cables and long spans; provide excellent ventilation to prevent overheating in high ambient temperatures. Wire Mesh Trays: Suitable for high-density data or signal cables; flexible and easy to modify on-site.

Trunking Systems: Used for organized routing in commercial or industrial settings, often for ELV or control cables. Material Choice: Hot-dip galvanized steel or stainless steel is recommended for outdoor or corrosive environments; GRP/FRP trays are lightweight, corrosion-resistant, and suitable for chemical exposure.

Pre-

Installation Requirements

Before installation, ensure: Approved shop drawings match site conditions. DEWA-approved routing, tray type, and accessories are confirmed. Tray size and load capacity are suitable for expected cable loads.

All tools and PPE are available.

Support and Mounting

Install supports (brackets, hangers, trapeze, wall supports) at 1. 2–1. 5m intervals, closer for heavier loads.

Use G

I threaded rods, anchor bolts, or chemical anchors as required. Ensure supports are rigid, level, and aligned. Mount trays using couplers, bolts, nuts, and spring washers; maintain smooth bends with factory-made bends/tees/reducers.

Cable Segregation and Fill Rate

Maintain strict separation of LV power, ELV, and control cables; use divider plates if necessary. Do not exceed 40–50% fill rate to ensure proper ventilation and prevent overheating. Observe minimum bending radius for power cables to avoid insulation damage.

Earthing and Bonding

Bond trays at every joint and connect to the main earthing system at least at one end. Use a minimum 16mm² copper bonding conductor unless specified otherwise. Environmental ConsiderationsUAE's high heat, humidity, and dust require corrosion-resistant materials and proper ventilation.

Outdoor installations should consider UV exposure and thermal expansion.

Inspection and Commissioning

Conduct internal QA/QC inspections for alignment, support spacing, and earthing. Obtain consultant or DEWA clearance before laying cables. Benefits of a Properly Installed SystemEnhanced Safety: Reduces risk of electrical faults, short circuits, and fire hazards.

Simplified Maintenance: Easy access for inspections and upgrades. Extended Lifespan: Protects cables from mechanical stress and environmental damage.

Future-

Proofing: Modular systems allow easy addition or removal of cables. By following these guidelines, combined cable tray installations in the UAE can achieve long-term reliability, safety, and compliance with local regulations.