Italian trapezoidal cable trays are connected using slotted joints that allow for mechanical alignment, thermal expansion, and electrical continuity, often complemented by grounding jumpers.

Connection Overview

Italian trapezoidal cable trays, such as those produced by Schiavetti Tekno and other manufacturers, are designed for industrial cable management and come in perforated, closed, or ladder types. The connection method focuses on mechanical stability, electrical continuity, and thermal expansion compensation .

Joint Assembly

• Slotted or crossed-slot joints are commonly used to connect tray sections. These slots allow for slight adjustments during installation, ensuring proper alignment and accommodating thermal expansion without damaging the tray or cables .
• Bolted connections secure the trays together. Bolts are inserted through the slots and tightened to maintain structural integrity while allowing minor movement.
• End plates or flanges may be used at the tray ends to provide additional support and alignment, especially in long runs or heavy-load applications.

Electrical Continuity

• Grounding holes are pre-marked on the trays and accessories to facilitate proper bonding.
• Copper bonding jumpers are installed across joints to ensure continuous electrical conductivity along the tray system, which is critical for safety and compliance with European standards .

Support and Alignment

• Trapezoidal trays are mounted on support brackets, wall brackets, or suspended supports. The supports are positioned to maintain the tray's trapezoidal profile and prevent sagging.
• Compatibility with Unistrut systems is common, allowing flexible attachment points and modular installation .

Thermal Expansion Considerations

• The slotted joint design allows trays to expand or contract due to temperature changes without causing stress or deformation.
• Proper spacing between supports and careful alignment of joints ensures that thermal movement does not compromise cable integrity or tray stability .

Standards Compliance

• Italian trapezoidal cable trays are manufactured in compliance with EN standards and international certifications (UL, IMQ), ensuring mechanical strength, corrosion resistance, and electrical safety .
• Installation should follow manufacturer guidelines to maintain warranty and safety compliance. In summary, the Italian trapezoidal cable tray connection method relies on slotted joints, bolted assembly, grounding jumpers, and careful support placement to ensure mechanical stability, electrical continuity, and accommodation of thermal expansion, making it suitable for demanding industrial environments .