How to wrap cable trays and cables

Cable trays can be wrapped using specialized fire-resistant wraps or proper coiling techniques to protect, organize, and secure cables.

Fire-

Resistant Cable Tray Wraps

For safety and fire protection, FireMaster Cable Tray Wraps are commonly used. These wraps consist of high-temperature resistant fibers encapsulated in a durable glass fiber reinforced aluminum foil. They are designed to protect grouped electrical cables during extended fire exposure, maintaining control of equipment operated by the cables.

Installation steps include: Lay the wrap over the cable tray, ensuring a minimum of 75mm (3 inches) overlap between adjacent blankets to prevent gaps. Seal cut edges with 100mm (4 inches) wide tape if using fully encapsulated or faced blankets. Secure the wrap with stainless steel bands (minimum 12.

5mm wide by 0. 4mm thick) at overlaps and at intervals of 262mm (10-1/2 inches) along the tray. Additional bands should be applied at elbows or bends to maintain tight joints.

Ensure the wrap is snug but not overly tight to avoid damaging the cables.

General Cable Wrapping Techniques

For organizing and managing cables within trays or for temporary setups, proper coiling methods prevent tangling and extend cable lifespan.

The Over/

Under (Roadie Wrap) method is highly recommended. Steps for the Over/Under method: Start with the connector: Hold the cable end in your non-dominant hand. Over loop: Bring the cable over your hand to form the first loop.

Under loop: Flip your hand and bring the cable under to form the next loop, countering twists. Alternate loops: Continue alternating over and under loops, keeping them consistent in size. Secure the end: Use a hook-and-loop fastener, cable tie, or thread the tail through the last loop to hold the coil in place.

Other methods like simple coiling or figure-eight wraps can be used for shorter or flexible cables, but the Over/Under method is preferred for long or heavy cables to prevent kinks and tangles.

Tools and Materials

Cable ties or zip ties: For securing bundles; choose heavy-duty ties for thick cables and flexible ties for smaller cables. Braided sleeves: Provide insulation and protection; flat braided sleeves are easier to rearrange, while traditional braided sleeves offer durability for permanent installations. Stainless steel bands: Required for fire-rated wraps to ensure secure attachment.

Best Practices

Ensure cables are untangled before wrapping to avoid stress and damage. Maintain consistent loop sizes for neatness and easy deployment. For fire-rated installations, follow manufacturer guidelines for overlaps, sealing, and banding to comply with safety standards.

Avoid over-tightening wraps or ties to prevent cable deformation or insulation damage. By combining proper coiling techniques with fire-resistant wraps where necessary, cable trays can be safely organized, protected, and maintained for long-term use.