Steel straps are used to secure and support cable trays by wrapping around the tray and fastening it to structural supports, ensuring stability, load distribution, and compliance with electrical codes.

Selecting and Preparing Steel Straps

Choose galvanized or stainless steel straps compatible with the cable tray material to prevent corrosion and ensure durability . The strap width and thickness should match the tray load and size. Inspect the tray and support structure to ensure it can handle the combined weight of the tray, cables, and straps .

Installation Steps

1. Determine Support Points: Mark the locations where the cable tray will be supported. Standard intervals are typically 1.5 to 2 meters, but check manufacturer specifications for your tray type .
2. Position the Tray: Lift the cable tray onto the supports, ensuring it is level using a laser or chalk line . Maintain a minimum clearance of 300 mm above or between systems for cable installation and maintenance .
3. Wrap the Steel Strap: Place the steel strap around the cable tray at the support point. Ensure the strap is positioned evenly and does not pinch or damage the tray edges .
4. Secure to Structural Support: Fasten the strap to the support element (wall bracket, ceiling hanger, or strut channel) using bolts, nuts, or approved fasteners. For ceiling suspension, threaded rods and Unistrut channels can be used to create a stable mounting point .
5. Tension the Strap: Tighten the strap to hold the tray firmly without deforming it. Avoid over-tightening, which can damage the tray or cables .
6. Check Electrical Continuity: If the cable tray serves as an equipment grounding conductor, ensure electrical continuity is maintained at intervals (typically every 18 meters) and that all metal connections are bonded .

Additional Considerations

• Bends and Splices: When securing trays near bends or splice plates, place straps within 600 mm of the bend or support to maintain stability .
• Future Load: Consider potential future cable additions when spacing straps to avoid overloading the tray .
• Environmental Protection: Use corrosion-resistant straps in humid or industrial environments to prevent rust and maintain structural integrity .
• Safety: Always wear gloves and safety equipment when handling steel straps to prevent injury . Using steel straps correctly ensures that cable trays remain secure, level, and code-compliant, providing safe and organized routing for electrical cables in commercial or industrial installations.