A horizontal cable tray is commonly referred to as a "straight section" or simply a "horizontal tray" in cable tray systems.

In cable tray systems, the straight sections form the main runs where cables are laid horizontally across ceilings, walls, or under floors, providing organized support and easy access for maintenance or expansion . These horizontal trays can be of various types, including ladder trays, perforated trays, solid-bottom trays, basket trays, and channel trays, each designed for specific cable loads, ventilation, and environmental conditions . Ladder trays are particularly common for horizontal runs because their rung-and-rail structure allows for excellent air circulation, heat dissipation, and support for heavy power cables . Perforated trays and basket trays are also used horizontally, especially for lighter cables or network installations, providing flexibility and ease of cable management . Horizontal trays are often complemented with horizontal elbows to change direction on the same plane, and reducers to connect trays of different widths while maintaining a continuous horizontal run . These trays are typically mounted using trapeze hangers, wall brackets, or ceiling supports to ensure stability and proper load distribution . In summary, the term "horizontal cable tray" or "straight section" is used to describe the main horizontal runs in a cable tray system, with the specific tray type chosen based on cable type, weight, and environmental requirements .