How many feet must the side rails of all ladders extend above the upper landing?

The requirement for the side rails of ladders to extend above the upper landing is set to ensure safety for users when transitioning onto and off of the ladder. Specifically, the standard mandates that the side rails must extend a minimum of 3 feet above the upper landing. This additional height provides stability and grip, helping to prevent falls and accidents when users step onto or off the ladder.

The rationale for this safety measure is to create a secure handhold that allows users to maintain balance and support as they navigate the area where the ladder ends. By extending the side rails adequately, it mitigates the risks associated with improper landings or abrupt transitions.

The other options do not meet the required safety standard. A 2-foot or 2 1/2-foot extension would not provide sufficient support, while a 6-foot extension, although safe, exceeds the minimum requirement and is generally unnecessary for standard applications. Therefore, the choice of a 3-foot extension aligns perfectly with established safety guidelines for ladder use in construction and general applications.