Methods for drilling holes for splicing cable trays

Drilling holes for splicing cable trays is typically done using templates or drill jigs to ensure accurate alignment and proper fit for splice plates.

Step-by-

Step Method1.

Marking and Preparation

Begin by marking the route of the cable tray and the position of the splice points. Identify the locations for support system fixing points and anchor holes. Ensure the tray is properly supported and accessible for drilling.

2.

Using Templates or Drill Jigs

The most common method is to use the splice plate as a template. Place the splice plate against the end of the field-cut tray section. Drill jigs or short side rail pieces with factory-punched holes can also be used to align the drill and act as a stop against the tray edge.

3.

Drilling the Holes

Clamp the splice plate securely to the tray side rail. Drill through the splice plate holes and into the tray using the correct drill size, which should match the hardware supplied with the tray system. After drilling, remove any burrs to prevent damage to cables and ensure a smooth fit.

4.

Surface Protection

If the tray or support channels are cut or drilled, protect exposed surfaces with zinc-enriched paint or other corrosion-resistant coatings to maintain durability. 5.

Assembly and Splicing

Align the drilled holes with the splice plate and adjoining tray section. Secure the splice plate using bolts, washers, and nuts as specified in the project drawings. Ensure the tray sections are level and properly supported according to wall, floor, or ceiling mounting requirements.

Tools and Safety Considerations

Tools: Electric drill, drill bits matching hardware size, clamps, deburring tools, and protective coatings. Safety: Wear gloves, eye protection, and ensure the tray is stable to prevent movement during drilling. Avoid cutting structural building members or installing trays in hoist ways or areas prone to physical damage.

By following these methods, drilled holes will align accurately with splice plates, ensuring a secure and structurally sound cable tray installation.