This short shows key steps: cutting sheet metal to size, punching or slotting for wire access, bending edges to form the tray shape, welding joints for strength, and smoothi Learn the essential process of making cable trays—those metal channels that organize and protect. This short shows key steps: cutting sheet metal to size, punching or slotting for wire access, bending edges to form the tray shape, welding joints for strength, and smoothi Learn the essential process of making cable trays—those metal channels that organize and protect. The purpose of this article is to define the sequence and methodology for the installation of electrical cable trays, cable trunking, cable raceways and boxes, junction and pull boxes. The method gives details of how the work will be carried out and what health and safety issues and controls that. B manufactures its cable tray in a range of materials with a variety of finishes. The selection of material and finish is a function of the environment in wh tant in a wide range of environments, and easily formable (Appendices II and III). Compared to ladder or solid-bottom trays, they are more flexible and better suited for complex environments. But before you lay the first tray or clamp down a single cable, you need a solid plan. This guide breaks down the process step by step. Hubbell Wiring Device-Kellems and Hubbell Premise Wiring are divisions of Hubbell Incorporated, a U. headquartered manufacturer with over 130 years of supplying solutions for the electrical and data markets.