The guide includes diagrams for mounting cable trays on walls using pre-fabricated flanges or channels, laying cables, and selecting the appropriate material and finish for the environment and application. Wire channels are. This guide provides step-by-step instructions on installing a cable tray on a wall, covering different types of cable trays, tools needed, and safety tips. Galvanised steel is the most cost-effective option for most applications. The. Cable trays, as an important component of modern building electrical systems, play a crucial role in supporting and protecting cable lines, ensuring smooth power and signal transmission. They provide a robust structural that accommodates and safely transports cables from one point to another.