A ladder tray is designed with two parallel rails connected by what element?

• A. Beams
• B. Crossbars
• C. Rungs
• D. Supports

Answer: (C)

In a ladder-style cable tray, the two long side rails are connected by members that form the “steps” of the ladder. Those connecting pieces are called rungs. They span between the rails at regular intervals, providing support for the cables and keeping them neatly separated. Rungs are typically welded or bolted to the rails and determine the ladder’s working height and spacing for cable placement, airflow, and ease of access.

While crossbars can describe similar connecting elements, the standard term for the parts linking the rails in a ladder tray is rungs. Beams would imply a different structural framing, and supports is too generic to describe the specific ladder-typical connection.