Installation of tray-type cable trays in the UAE

Installing cable trays in the UAE requires selecting the right tray type, following DEWA standards for support and spacing, ensuring proper grounding, and using materials suited for the harsh GCC climate.

Step 1: Planning and Route Marking

• Select the appropriate tray type based on load and environment: ladder trays for heavy power cables, perforated trays for commercial applications, and wire mesh trays for IT or low-voltage cables .
• Mark the cable tray route using a laser level or chalk line on walls, ceilings, or soffits, maintaining clearances from other services like fire lines or gas pipes .
• Ensure minimum clearance from the finished floor (typically ≥ 2.1m in walkable areas) and avoid sharp bends that could damage cables .

Step 2: Installing Supports

• Install supports such as brackets, hangers, trapeze, or wall supports at intervals of 1.2–1.5m, adjusting for heavier loads or wider trays .
• Use GI threaded rods, anchor bolts, or chemical anchors as required, ensuring supports are rigid, aligned, and levelled.
• Proper support prevents sagging and deformation, which is critical in high-temperature environments like the UAE .

Step 3: Mounting Cable Trays

• Mount trays on supports and join sections using couplers with bolts, nuts, and spring washers .
• Maintain smooth bends using factory-made bends, tees, or reducers; avoid sharp edges.
• Follow segregation rules: separate LV power from ELV/control cables, or use divider plates if sharing the same tray .
• Do not exceed 40–50% tray filling to ensure ventilation and prevent overheating .

Step 4: 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.
• Proper grounding prevents electrical hazards and ensures compliance with DEWA and NFPA standards .

Step 5: Material Selection for UAE Conditions

• Hot-Dip Galvanized (HDG) steel is recommended for outdoor and industrial installations due to corrosion resistance .
• Pre-galvanized steel is suitable for indoor environments like data centers or offices.
• For highly corrosive or coastal areas, stainless steel (SS304 or SS316) provides superior durability .
• Accessories such as couplers, bends, and brackets must be high-quality to maintain structural and electrical continuity .

Step 6: Inspection and Clearance

• Conduct internal QA/QC inspections for alignment, support spacing, and earthing.
• Obtain consultant or DEWA approval before laying cables in trays .
• Ensure all trays are free from sharp edges, properly supported, and compliant with approved drawings.

Step 7: Environmental Considerations

• UAE's high heat, humidity, and dust require trays with good ventilation and corrosion-resistant finishes .
• Covers may be used to protect cables from dust and debris, especially in industrial or coastal areas . By following these steps, engineers and technicians can ensure a safe, durable, and standards-compliant cable tray installation suitable for the UAE's challenging environmental conditions.