Drilling Holes for splice plates must be drilled in field-cut cable trays. Before starting, ensure you have the correct personal protective equipment (PPE), including gloves, safety glasses, and a hard hat. w!In this video, watch the complete process of installing a cable tray on site — from climbing the ladder, drilling holes, fixing raw. Mark the cable tray route based on your electrical cable tray design and site layout. A drill is a must for making holes in walls and floors. Use: Phillips Screwdriver for. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American copyright conventions.