Cable trays support insulated electrical cables in industrial and commercial settings. There are several types of cable trays, including ladder, perforated, solid bottom, basket, and channel trays. Channel tray can protect against. The B-Line series Cable Tray Manual was produced by our technical staff. Unlike conduit systems, cable trays allow cables to be laid in bundles, improving accessibility, heat. A cable tray system is a unit assembly of sections and fittings that forms a rigid structural system used to securely fasten or support cables and wiring. A complete system is made up of.