Generally speaking, the distance between the upper side of the cable trays and the ceiling may not be less than 300 mm and the vertical distance between the two parallel cable trays may not be less than 150 mm. 4.Tie the cable using cable tie and label the cables as required. 3.Lay the cable keeping the distance as per calculation. 2.Fix the cable tray according to the site, can be hanging on the ceiling or installing on the wall. Install cable tray support using a pre-fabricated flange or GI channel. Cable tray is more flexible than conduit and has a simpler and more approachable design. Many types of cable trays, such as mesh trays, are specifically designed with the goal of saving costs in mind. The tray is usually cheaper compared to the conduit, thanks to the reduction in labor costs. The cable tray types to choose from are ladder, ventilated trough, or solid bottom. Metal cable trays are made of galvanized steel, stainless steel, and aluminum. Electrical cable trays are mechanical support systems that provide a rigid structural system for electrical cables, raceways, and insulated conductors used for electric power distribution, control, signal instrumentation, and communication.