How to secure sheet metal plates to cable trays

Sheet metal plates can be securely attached to cable trays using nuts and bolts, screws, cable ties, or specialized separation plate supports depending on the application and tray type.

Methods for Securing Plates

1. Nuts and Bolts

• Flat metal plates with pre-drilled holes are commonly used to cover or join cable trays.
• Align the plate over the tray and insert bolts through the holes in both the plate and tray sides.
• Tighten nuts to the recommended torque to ensure a secure hold and prevent loosening due to vibration .
• This method is highly reliable and allows for easy maintenance or removal if needed. 2. Screws
• For lighter applications or smaller plates, self-tapping screws can be used to attach the plate directly to the tray.
• Ensure the screws are compatible with the tray material (steel or aluminum) to avoid stripping or corrosion .
• Screws are often used in combination with washers to distribute load and prevent deformation of the plate. 3. Cable Ties
• In some cases, especially for separation plates, heavy-duty cable ties can secure the plate to intermediate cleats or rungs of the tray .
• This method is quick and tool-free but is generally suitable for lighter plates or temporary installations. 4. Specialized Separation Plate Supports
• Separation plate supports (e.g., APT supports) are designed to attach separation walls or plates to cable trays, particularly to separate high- and low-voltage cables .
• The support is fixed to the tray using screws or cable ties, and the plate is then mounted onto the support.
• This ensures proper spacing and stability while maintaining electrical safety standards.

Best Practices

• Material Compatibility: Use fasteners that match the tray material to prevent galvanic corrosion (e.g., stainless steel bolts for aluminum trays), .
• Torque Control: Apply proper torque to nuts and bolts to avoid loosening under vibration or load .
• Load Considerations: Ensure the plate and fasteners can withstand the weight of the plate and any additional mechanical stress.
• Maintenance Access: Design the attachment so plates can be removed easily for cable inspection or maintenance.
• Separation Requirements: When separating different voltage cables, use dedicated separation plates and supports to comply with safety standards . By following these methods and best practices, sheet metal plates can be securely and safely attached to cable trays, ensuring both mechanical stability and electrical safety.