Galvanized connecting plate for cable trays

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Connecting plates for galvanized cable trays should be secured at both ends with at least two bolts, ensuring mechanical stability and proper alignment without requiring grounding jumpers.

Selecting the Right Joint Plate

For galvanized cable trays, the most common connecting plates are splice plates, which are flat metal plates with pre-drilled holes designed to join two tray sections end-to-end . Other options include adjustable joint plates for minor alignment corrections and universal splice kits compatible with multiple tray types . Material selection is critical: galvanized steel plates are preferred to match the tray material and maintain corrosion resistance .

Installation Steps

Align Tray Sections: Position the two tray sections so that their ends are flush and properly aligned. Ensure the tray is level and supported according to the design layout .
Position the Splice Plate: Place the splice plate on the side rails of the tray, ensuring the pre-drilled holes line up with the tray holes . For adjustable plates, make minor adjustments to achieve perfect alignment.
Insert Bolts: Use at least two bolts per end of the splice plate. Bolts should be fitted with lock nuts or spring washers to prevent loosening due to vibration . Standard nuts and bolts are sufficient; torque control is recommended to ensure long-term stability .
Tighten Securely: Use appropriate tools such as spanners or torque wrenches to tighten the bolts. Avoid over-tightening, which can damage the galvanized coating, and ensure the connection is firm and stable .
Check Alignment and Stability: After tightening, verify that the tray sections are straight, level, and capable of supporting the intended cable load without sagging .

Grounding Considerations

For galvanized trays, jumpers between connection plates are not required because the galvanization provides sufficient electrical continuity . However, the entire tray system must still be connected to the protective earth (PE) at multiple points along the run to ensure proper grounding .

Maintenance and Safety Tips

Inspect connections periodically for loosening or corrosion.
Ensure all bolts remain tight, especially in areas subject to vibration.
Avoid damaging the galvanized coating during installation to maintain corrosion resistance .
Follow local electrical codes and manufacturer guidelines for load capacity and support spacing .

By following these steps, galvanized cable trays can be securely connected, providing mechanical strength, electrical continuity, and long-term durability for industrial and commercial installations .

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