Straight and Bend Splicing of Cable Trays

Straight and bend splicing of cable trays involves using splice plates and brackets to securely join sections while accommodating expansion, load, and bend radius requirements.Straight Splicing

Straight splicing is used to connect two linear sections of cable tray. Key steps include:

• Align the tray sections end-to-end and insert splice plates across the joint. Most systems require two splice plates per length for stability .
• Fasten the splice plates using bolts or nuts, ensuring the smooth head faces inward to prevent cable damage .
• Support the tray at the splice location and at intervals along the run according to the tray's load rating and manufacturer guidelines .
• Expansion considerations: For long runs, expansion splice plates may be used to allow thermal contraction or expansion, with the tray anchored at the midpoint between expansion joints and guided at other supports .

Bend Splicing

Bend splicing allows the tray to change direction horizontally or vertically:

• Horizontal bends: Use pre-fabricated bend fittings or fabricate bends by cutting and removing side wires, then forming the tray to the desired radius .
• Vertical bends (risers): Install riser links in pairs on each side of the tray to maintain structural integrity .
• Splice plates for bends: Insert splice plates at the start and end of the bend section, similar to straight splices, to secure the connection .
• Radius considerations: Ensure the bend radius is sufficient to prevent cable damage and maintain proper cable support. Standard radius plates or adjustable radius methods can be used depending on the tray system .

Best Practices

• Always use personal protective equipment (PPE) during installation, including gloves and safety glasses .
• Follow manufacturer guidelines for the number of fasteners, spacing, and support locations .
• Ensure bonding and grounding requirements are met; some systems include UL-classified equipment ground conductors .
• For modular or custom tray systems, use appropriate brackets (e.g., TX brackets for tees or crosses) and secure all joints in pairs . By following these practices, straight and bend splicing ensures mechanical stability, electrical safety, and proper cable management across the cable tray system .