How to drill angled holes in cable trays

Use templates, jigs, and proper drill guides to accurately drill angled holes in cable trays while ensuring safety and alignment with support systems.Techniques for Drilling Angled Holes1. Using a Splice Plate or Template For field-cut cable trays, the most common method is to use a splice plate as a template. Clamp the splice plate to the tray side rail and drill through the pre-existing holes in the plate to ensure correct alignment. Drill jigs or short side rail pieces with factory-punched holes can also serve as stops to maintain consistent hole placement . After drilling, always remove burrs to prevent injury and ensure proper fitting. 2. Angled Drilling with a Jig If you need to drill at a specific angle, you can create an angled jig from scrap wood or metal. Drill a pilot hole perpendicular to the angled surface of the jig, then use it to guide your drill into the cable tray at the desired angle. Tools like a speed square can help measure and maintain the correct angle, especially for repeated holes . 3. Drill Press or Hand Drill Adjustments For precise angles, a drill press with an adjustable table or a hand drill with an angled guide can be used. Ensure the jig or guide is securely clamped to prevent movement during drilling. For multiple holes at the same angle, a custom jig ensures consistency and reduces the risk of misalignment .Tools and Safety ConsiderationsDrills and Bits: Use drill bits that match the hardware supplied with the cable tray. For metal trays, high-speed steel or cobalt bits are recommended.Protective Equipment: Wear Kevlar gloves, eye protection, and appropriate footwear to prevent injuries from sharp edges or metal shavings .Surface Protection: Apply zinc-rich paint or protective coatings to cut or drilled surfaces to prevent corrosion .Avoid Mixing Metals: Do not use the same drill bit on different metals like stainless steel and carbon steel to prevent galvanic corrosion .Installation AlignmentAfter drilling, mark the tray route and support fixing points. Drill anchor holes for supports and assemble the support system according to the design, whether wall-mounted, ceiling-suspended, or bracket-mounted. Ensure bends maintain the minimum permissible radius for cables to prevent damage . By combining templates, angled jigs, and proper safety practices, you can achieve accurate, clean, and structurally sound angled holes for cable tray installations.