Which articulated ladder configuration should be used when working on stairs?

The stepladder in staircase configuration is specifically designed for use on stairs, making it the ideal choice for that scenario. This configuration allows the ladder to stabilize against the unique contour of a staircase, providing a secure base that prevents sliding or tipping. It’s constructed to accommodate the angle and shape formed by the stairs, ensuring that workers can maintain both safety and accessibility when performing tasks on uneven surfaces like staircases.

On the other hand, the extension ladder configuration, single ladder configuration, and A-frame configuration are not suited for stair use due to their design limitations. Using an improper ladder configuration could lead to instability and increase the risk of accidents, emphasizing the importance of selecting the right ladder setup when working in such environments.