Angle steel supports are a more traditional and reliable choice for electrical cable tray support. These supports consist of angle steel, fasteners, and connectors, and they are typically welded or bolted into place. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. With our many years of experience, we are one of the leading manufacturers in this field. UNITECH's metal framing channel is cold formed on modern rolling machines from low carbon. nduit pipe and other wiring systems. In addition, its design does not contribute to potential safety problems should be done in the design phase.