A portable ladder must extend how many feet above its point of support?

A portable ladder must extend at least 3 feet above its point of support to ensure safety and stability when in use, particularly when it is leaning against a surface such as a roof or a wall. This extension provides a secure handhold for users in order to safely access higher areas and helps maintain balance while ascending or descending.

If the ladder does not extend this minimum distance, there is a risk that the user may have difficulty securing themselves, which could lead to falls or accidents. The 3-foot guideline is a widely accepted practice in ladder safety protocols and is designed to enhance user safety by allowing sufficient room for the user to grasp the ladder as they reach the top.