What part of a ladder is considered the beam?

The beam of a ladder refers to the main structural members that provide support and stability while allowing weight to be distributed evenly across the ladder. These beams are essential for the overall integrity of the ladder as they bear the load when a firefighter or any individual is using it. The configuration of the beams, typically located on either side of the ladder, is designed to withstand significant forces and provide a stable climbing surface.

The extension mechanism, while important for the adjustability of certain types of ladders, does not serve the structural role of the beams. The footing that contacts the ground is designed to provide stability and prevent slipping but does not bear the load itself in the same way the beams do. Similarly, the rungs are critical for user access but are not designed for load-bearing as the beams are. Understanding this distinction is fundamental for ladder operation and safety in firefighting scenarios.