What component is designed to prevent the beams of a wooden ladder from separating?

The tie rod is the component specifically designed to prevent the beams of a wooden ladder from separating. This rod runs between the two beams of the ladder, maintaining structural integrity and stability. By preventing the beams from spreading apart, the tie rod helps to ensure that the ladder remains strong and safe for use, especially when subjected to weight or stress during operations.

Other options do serve distinct functions; for example, the cross brace contributes to the rigidity of the ladder but does not directly prevent beam separation. Rungs are the steps where firefighters place their feet, essential for climbing but not related to structural stability in terms of beam separation. The foot pad provides stability and traction when the ladder is in use but does not impact the connection between the beams.