Fiberglass cable trays and cable tray fixing

Proper fixing of fiberglass cable trays ensures stability, prevents deformation, and extends the service life of the cable system.

Key Considerations for Fixing Fiberglass Cable Trays

Material and Load Assessment: Fiberglass (GRP/FRP) cable trays are lightweight, corrosion-resistant, and non-conductive, making them ideal for harsh environments such as chemical plants, coastal areas, and underground utilities. Before installation, ensure the tray's load-bearing capacity matches the total cable weight to prevent sagging or deformation .

Support Structure: Install supports according to design drawings, considering tray route, height, and spacing. Common support methods include:

• Wall-mounted brackets for secure attachment to vertical surfaces .
• Ceiling-mounted rods or trapezes to suspend trays at the correct height, allowing easy cable access and ventilation .
• Floor-mounted bases for heavy-duty or low-ceiling installations . Support spacing should not exceed the distance between splice plates, and fittings should be supported per NEMA FG-1 standards .

Fixing and Fastening: Use appropriate fasteners and clamps, such as B-Line BFPU751 series clamps for beam attachments, ensuring proper thread engagement for load ratings. Torque for threaded rod nuts should be around 3–4 ft.-lbs .

Cutting and Drilling: Fiberglass can be cut and drilled like hardwood. Use carbide-tipped saw blades or standard twist drills, applying moderate pressure to avoid chipping or resin softening. Seal any cut or drilled surfaces with compatible resin to maintain structural integrity .

Installation Sequence:

1. Conduct on-site inspections and pre-measure bends, ramps, and T-junctions .
2. Install supports first, ensuring alignment and stability.
3. Place tray sections, maintaining proper spacing and alignment. Splices should ideally be located at quarter-span points .
4. Secure trays with clamps, brackets, and cable tie mounts to prevent movement .

Safety Precautions: Wear masks, long sleeves, and gloves when cutting or drilling to prevent skin irritation from fiberglass dust. Handle trays carefully to avoid impacts or prolonged sun exposure, which can degrade the material .

By following these guidelines, fiberglass cable trays can be securely fixed, ensuring long-term stability, safety, and minimal maintenance in demanding environments .