The correct drill size depends on the hardware supplied with the cable tray. Mark the position of the support system fixing points. Mark the cable tray route based on your electrical cable tray design and site. Here is a step-by-step guide on how to install a standard metal cable tray system (e. Before starting, ensure you have the correct personal protective equipment (PPE), including gloves, safety glasses, and a hard hat. Check Regulations: Consult the National Electrical. Drilling a hole for cable management may seem like a simple task, but getting it right can make a world of difference when it comes to keeping your cables organized and your space looking neat. Whether you're setting up a home theater system, installing a new desk, or simply trying to hide those. Developed by Interstates, this cable tray cutting guide acts as a guide for a metal cutting circular saw for cutting the side rail of a cable tray as well as a guide for drilling the connecting holes in the cable tray.