Quick Positioning for Drilling Holes in Cable Trays

Accurate hole positioning in cable trays can be achieved using pre-marked templates, measuring guides, and consistent alignment with tray supports.

Planning and Marking

Before drilling, plan the tray route and support locations carefully. Mark the positions for holes based on the tray type, load requirements, and mounting points. For ladder or wire mesh trays, holes are often pre-punched, but for solid-bottom or trough trays, field drilling is required.

Use a measuring tape, square, and level to ensure marks are straight and evenly spaced along the tray length ( ).

Using Templates and Guides

To speed up positioning, use a template or the tray's dropout as a guide. For example, in trough trays, the dropout can be temporarily placed to mark the center and edge holes, ensuring consistent spacing for bolts and connectors ( ). This reduces errors and ensures alignment with support brackets.

Drilling Best Practices

Select the correct drill bit size for the bolts or rivets specified in the installation instructions (e.g., 7/16” for solid-bottom trays, 5/16” for dropouts) ( ). Clamp the tray securely to prevent movement during drilling. Drill perpendicular to the tray surface to maintain proper alignment and avoid misfit of connectors.

Deburr holes after drilling to prevent cable damage and ensure smooth installation of fasteners. Alignment with SupportsEnsure that holes align with the center of tray hangers or spring nuts. For solid-bottom trays, drill holes approximately 1” from the inside edge to accommodate bolts and washers ( ).

Maintain consistent spacing between supports, typically 1. 5 to 3 meters depending on tray type and load ( ).

Additional Tips

Label drilled holes if multiple trays or sections are being installed to avoid confusion. Check for clearance above and around the tray to allow for cable routing and future maintenance. Use a level or laser guide for long runs to maintain straight alignment and reduce cumulative errors.

By combining pre-marking, templates, and careful alignment with supports, drilling holes in cable trays can be performed quickly, accurately, and safely, ensuring a professional and durable installation ( ).